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Metal lithium superdispersed deposited powder

Metal lithium superdispersed deposited powder
IPC classes for russian patent Metal lithium superdispersed deposited powder (RU 2513987):
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FIELD: process engineering.

SUBSTANCE: invention relates to super disperse deposition of metal lithium powder or thin lithium foil of substrate without solvents. Proposed method comprises deposition of metal lithium powder or thin lithium film of carrier. Said carrier is brought in contact with substrate of higher affinity to metal lithium powder compared with that of carrier to said powder. Said substrate in contact with carrier is subjected to conditions sufficient for transfer of deposited powder or film on said substrate. Carrier and substrate are separated to preserve said powder of film deposited on said substrate.

EFFECT: ruled out reduction in lithium cell charge capacity.

12 cl, 2 dwg, 9 ex, 1 tbl

 

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the priority of provisional application U.S. serial number 61/266308, filed December 3, 2009, the contents of which are incorporated here by reference in its entirety.

SCOPE AND BACKGROUND of the INVENTION

[0002] the Present invention relates to a method of finely dispersed precipitation of lithium metal powder on the substrate. This tonkodispersnoe precipitated powder metal lithium can be used, for example, in the formation of the electrode for the primary or secondary (rechargeable) batteries.

[0003] lithium and Lithium-ion secondary, or rechargeable, batteries have been used in certain areas, such as mobile phones, camcorders, and portable computers, and more recently even in devices with higher power, such as electric vehicles and hybrid electric vehicles. In these embodiments, the application preferably, the secondary battery had the highest specific capacity, but still provide safe conditions and good cycloramas so that a high specific capacity was maintained in subsequent cycles of discharging and charging.

[0004] Although there are various designs of secondary batteries, each design includes a positive electrode (or Kato is), the negative electrode (or anode), a separator that separates the cathode and anode, and an electrolyte in electrochemical communication with the cathode and anode. In a secondary lithium ion battery, lithium ions migrate from the anode to the cathode through the electrolyte, when the secondary battery is discharged, that is used for its intended purpose. During the discharging process, the electrons are collected from the anode and pass through to the cathode through an external circuit. When the secondary battery charge or recharge, the lithium ions are transferred from the cathode to the anode through the electrolyte.

[0005] Historically, the lithium secondary battery received with use as cathode active materials militiaman compounds with high specific capacity, such as TiS2, MoS2, MnO2and V2O5. These cathode active materials combined with the anode of metallic lithium. When the secondary battery is discharged, lithium ions were transferred from the lithium metal anode to the cathode through the electrolyte. Unfortunately, when Cycling metallic lithium was formed dendrites, which eventually led to dangerous conditions in the battery. As a result, the production of secondary batteries of these types in the early 1990-ies was discontinued in favor of lithium-ion batteries.

[0006] lithium-ion batteries usually as a cathode active material used in the t of the oxides of lithium-metal such as LiCoO2and LiNiO2in combination with the anode on a carbon basis. In these batteries eliminated the formation of lithium dendrites on the anode, and thereby batteries are made safer. However, Li, "useful", the number of which determines the capacity of the battery, fully supplied from the cathode. This limits the choice of cathode active materials as active materials must contain recoverable lithium. In addition, deleteelement products formed during charging and over-charging, tend to be unstable. In particular, these deleteregvalue products tend to react with the electrolyte and to highlight the warmth that exacerbates the security problems.

[0007] in Addition, the new lithium-ion cells or batteries are in a discharged state. During the first charge lithium-ion element lithium moves from the cathode material, such as LiCoO2or LiNiO2to the anode material, such as graphite. Passivation film, which is formed on the anode, called the solid electrolyte layer, or SEI (from the English. solid electrolyte interface). The SEI film occurs due to the electrochemical reduction of the substances present in the electrolyte at the electrode surface. Subsequent discharge of lithium consumed in the formation of the SEI does not return to the cathode. This causes the lithium-ion element, having smaller capacity compared to the original charging capacity, because some of the lithium was consumed in the formation of SEI. Irreversible expenditure of available lithium reduces the capacity Li-ion item. This phenomenon is called irreversible capacity and, as you know, absorbs about 10% to 20% of the capacity of conventional lithium-ion element. Thus, after the initial charge of lithium-ion element Li-ion cell loses approximately 10% to 20% of its capacity.

[0008] One solution was the use of a powder of stabilized lithium metal ("SLMP®") for pre-litvinovna anode. For example, powder of lithium can be stabilized by surface passivation of metal powder by the action of CO2so, as described in U.S. patent No. 5567474, 5776369 and 5976403, the contents of which are included here by reference in its entirety. However passivated by the action of CO2the lithium metal powder can be applied only in the air with low humidity levels within a limited period of time before the content of metallic lithium will fall due to the reaction of metallic lithium with air. Another solution consists of applying a fluorinated coating on the lithium metal powder as described in U.S. patent No. 7588623, soda is the content of which is included here by reference in its entirety. Another solution is to create a wax layer, such as described in the publication U.S. No. 2009/A, the contents of which are incorporated here by reference in its entirety. However, there remains a need for improved methods of powder deposition of metallic lithium on a variety of substrates for forming a battery.

The INVENTION

[0009] the Present invention provides a method of finely dispersed precipitation of lithium metal powder or formed by powder lithium thin foil on a substrate, avoiding the use of solvent. The method includes the deposition of lithium metal powder on the carrier, bringing the carrier into contact with the substrate having a higher affinity for the metal powder of lithium compared with the affinity of the carrier for the powder metal lithium, the exposure of the substrate in contact with the carrier, the conditions sufficient to transfer deposited on the carrier powder of metallic lithium on a substrate, and the separation of the carrier and the substrate to retain the powder metal lithium tonkodispersnoe deposited on the substrate. Optionally, instead of lithium metal powder may be used formed by powder lithium thin foil. Also provides a battery comprising a substrate formed with the t is one method.

BRIEF DESCRIPTION of DRAWINGS

[0010] the Above objectives and advantages of the present invention will become clearer from the detailed description of the options for implementing the present invention involving accompanying drawings, in which:

[0011] Figure 1 represents the voltage curve of the first cycle, corresponding to Example 7.

[0012] Figure 2 is a curve of the voltage of the first cycle, corresponding to Example 8.

DETAILED description of the INVENTION

[0013] the terminology Used here is intended solely for the purpose of describing a particular implementation options and is not intended to limit the invention. Used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Forms used here in the singular assumed also includes the plural, unless the context clearly indicates otherwise. In addition, it will be understood that the terms "includes" and/or "comprising", as used in this description, means the presence of these features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups.

[0014] Unless otherwise noted, all used the s here, the terms (including technical and scientific terms have the same meaning as it is commonly understood by a person of ordinary skill in the art to which belongs the present invention. In addition, it will be understood that terms such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless it is not clearly defined here.

[0015] In accordance with the present invention, the lithium metal powder tonkodispersnoe precipitated on a substrate without the use of solvent. The lithium metal powder is in the form of thin-dispersed powder. The lithium metal powder typically has an average particle size less than about 60 microns, and often less than about 40 microns. The lithium metal powder may be in the form of a powder of stabilized lithium metal ("SLMP®"), such as described, for example, in U.S. patent No. 5976403 and 6706447, the contents of which are included here by reference in its entirety.

[0016] If used formed by powder lithium slim lithium foil, it will have a thickness of about 20 microns or less.

[0017] the lithium metal Powder is first precipitated on the carrier. The media can be a synthetic is s or semi-synthetic amorphous solid polymer, cellulose, glass, metal (e.g., metal foil) or separator material (e.g. polypropylene, polyethylene or a laminate of them). For example, a sample of solid polymers include polypropylene film (for example, film InteToppTMType AA), polyethylene, or a complex of the polyester. Exemplary metal carriers include foil made of copper (Cu) or copper alloy. In one implementation, the surface of the carrier may include various additives to improve the processing performance, reduce cost, and to change the affinity of the carrier for the powder metal lithium. The carrier may be in the form of a film, foil, mesh or the like. The media often has a thickness of from 10 microns to 200 microns. The purpose of media is to deposition or migration of the lithium metal powder on the substrate. The carrier has an affinity for the metal powder of lithium; however, its affinity is lower than the affinity for the substrate, which must be precipitated powder of metallic lithium. If you use formed from a powder of lithium slim lithium foil, it may be printed or deposited using the same procedure as for the transfer of a powder of lithium, with the application of appropriate pressure. Alternatively, the carrier may be applied binder, such as EVA, SBR, wax, etc. Then n is Khabibullina can be electrostatically precipitated SLMP ®.

[0018] the lithium metal Powder may be deposited on the carrier by the method of screening, spraying, coating, printing, painting, dipping, and the like, the choice of which will be within the competence of the specialist in this field of technology. It could also be precipitated using the technology of deposition in the stream of vapor high pressure settling in the gas flow and the like, which provide a very high deposition rate and the deposition without the use of solvent with the use of mechanical forces.

[0019] the Substrate has a higher affinity for the metal powder of lithium compared with the affinity of the carrier for the powder metal lithium. Suitable substrates may include carbonaceous materials, Li4Ti5O12and other materials introduction lithium, Si, Sn, Cu, SiO, oxides of tin, alloys of tin, alloys of transition metals, nitrides of lithium-metal oxides, lithium metal, and their mixtures and composites, as well as Cu-th foil and other metal alloys. The substrate can be processed or brought into contact with the means to promote affinity of lithium metal powder to the substrate. Suitable stimulating affinity tools include a polymeric binder, such as vinyl acetate, butadiene-styrene rubber, butadiene rubber and the copolymer ethyl is a-propylene-diene monomer, natural waxes, such as 12-hydroxystearate acid, synthetic waxes such as polyethylene with a low molecular weight, petroleum waxes such as paraffin wax and microcrystalline wax.

[0020] During operation, the media usually pripressovyvajut to the substrate under pressure, such as from 100 to 20000 psi (pounds per square inch). Using the affinity of lithium metal powder on the substrate to create non-continuous (intermittent) layer of lithium metal powder. Additionally, the lithium metal powder is deformed during its deposition.

[0021] the Substrate may be in the form of the electrode surface. After the powder of the metallic lithium deposited, the carrier and the substrate can be separated in a way that is sufficient to preserve the lithium metal powder on the substrate.

[0022] the Substrate can be used in a wide range of applications, in which the desirable properties of the lithium metal powder. For example, the substrate may be formed in the anode for the secondary battery, such as described in U.S. patent No. 6706447, the content of which is incorporated here by reference in its entirety. A typical secondary battery includes a positive electrode, or cathode, the negative electrode, or anode, a separator for separating the positive electrode and the negative electron is kind, and an electrolyte in electrochemical communication with the positive electrode and negative electrode. The secondary battery includes a current collector, which is in electrical contact with the cathode and the current collector, which is in electrical contact with the anode. The current collectors are in electrical contact with each other through an external circuit. The secondary battery may be any known in the art design, such as "jelly roll" (roll gel"), or batch design.

[0023] the Cathode is formed of the active material, which is usually combined with the carbonaceous material and a polymeric binder. The active material used in the cathode, and preferably is a material that can be Litvinova when a suitable voltage (e.g., from 2.0 to 5.0 V relative to lithium). Preferably, the active material can be used deletirovanie materials, such as MnO2V2O5, MoS2, metal fluorides, or mixtures thereof, and more preferably used MnO2. However, it can also be applied lityeraturnyye materials such as LiMn2O4that may be additionally literaaly. Deletirovanie active materials are preferred because they generally have higher specific capacity, mengchu the cost and provide more choice, than lityeraturnyye active materials in this design, and thus can provide increased capacity, as compared with the secondary batteries that include lityeraturnyye active materials. In addition, since the anode includes lithium, as discussed below, for operation of the secondary battery is not necessary that the cathode included litigiously material. The amount of active material provided in the cathode, is preferably sufficient to receive the extracted metallic lithium present in the anode.

[0024] the Anode is formed from a substrate capable of absorbing and decarbonate lithium in an electrochemical system.

[0025] Other potential applications of the substrate include a current collector for primary batteries, the surface of the polypropylene high density, which could be used to manufacture parts of the neutron detector.

[0026] the Following examples are only illustrative for the invention and not limit it.

EXAMPLES

Example 1

[0027] the polypropylene film InteToppTMType AA with an area of 50 cm2besieged 12 mg SLMP®. Then the film carrier SLMP slightly priateli using polypropylene cushion for jewelry work, so that the particles stuck to the film. Then the film carrier brought into contact with the carbon electrode of the battery with an area of 50 cm 2. Then the package of the film carrier and the electrode was pressed with a force of 1500 pounds. After pressing the tape was taken away millimetre from the electrode, having besieged approximately 8 mg of lithium (about 0.16 mg/cm2).

Example 2

[0028] the polypropylene film InteToppTMType AA with an area of 284 cm2besieged 100 mg SLMP. Then the film carrier SLMP slightly priateli using polypropylene cushion for jewelry work, so that the particles stuck to the film. Then the film carrier brought into contact with the carbon electrode of the battery with an area of 284 cm2. Then the package of the film carrier and the electrode was pressed using a hand roller. After pressing the tape was taken away millimetre from the electrode, having besieged approximately 80 mg of lithium (about 0.4 mg/cm2).

Example 3

[0029] the polypropylene film InteToppTMType AA, contains stimulating the adhesion of the EVA tool, napisali SLMP. Then the film carrier brought into contact with the negative electrode of the battery. Then the package of the film carrier and the electrode was pressed. After pressing the tape was taken away millimetre from the electrode, having besieged the layer of thin lithium foil negative electrode.

Example 4

[0030] the polypropylene film InteToppTMType AA napisali SLMP with stimulating the adhesion of a coating of EVA. Then the film carrier brought into contact with the negative electrode of the battery. Then the package from plank the carrier and the electrode was pressed. After pressing the tape was taken away millimetre from the electrode, having besieged the layer of thin lithium foil negative electrode.

Example 5

[0031] On the treated by corona discharge side of the plastic film of polypropylene InteToppTMType BA with an area of 249 cm2besieged 100 mg SLMP using suspension butadiene-styrene copolymer/BYK-P 104S in toluene in the ratio of SLMP:SBR:BYK = 100:10:5. After evaporation of the solvent the film carrier brought into contact with the copper foil. Then the package of the film carrier and the copper foil was subjected to calandrinia. After calendering polypropylene film was taken away millimetre from the copper foil, having besieged 26 mm layer of thin lithium foil.

Example 6

[0032] On the treated by corona discharge side of the plastic film of polypropylene InteToppTMType BA with an area of 249 cm2besieged 48 mg SLMP using suspension butadiene-styrene copolymer/BYK in toluene. After evaporation of the solvent the film carrier brought into contact with the electrode of MCMB-25-28 (90%) + carbon black (3%) + PVdF (7%) with an area of 249 cm2. Then the package of the film carrier and the electrode was subjected to calandrinia. After calendering polypropylene film was taken away millimetre from the electrode, having besieged 47 mg layer thin lithium foil.

Example 7

[0033] On the treated by corona discharge side of the plastic film of polypropylene InteToppTMType BA with whom the horse 49 cm 2besieged 5 mg SLMP using suspension butadiene-styrene copolymer/BYK in toluene. After evaporation of the solvent the film carrier brought into contact with the electrode of MCMB-25-28 (90%) + carbon black (3%) + PVdF (7%) with an area of 49 cm2. Then the package of the film carrier and the electrode was subjected to calandrinia. After calendering polypropylene film was taken away millimetre from the electrode, having besieged the layer of thin lithium foil. Then the electrode MCMB 2528 gathered in the item batch against the positive electrode of LiMn2O4(90%) + carbon black (5%) + PVdF (5%). The electrolyte used a 1M solution LiPF6/EC+DEC (1:1) from the firm Novolyte. For comparison, gathered basic elements with the same configuration that does not contain SLMP. After assembling the elements of the batch was tested on the device for Cycling Maccor series 4000. Used testing method was a CC 12 mA to 4.3 V, CV (constant voltage) with a time step equal to 10 hours. The discharge CC (constant current) at 12 mA to 3.0 Century Before the procedure, the Cycling of elements left to Mature for 5 hours, to allow time to complete the process prior litvinovna. Table 1 below summarizes the data for the base and containing SLMP elements in the case of Example 7. Figure 1 shows the voltage curve of the first cycle for the demonstrative base and containing SLMP ELEH the clients.

Table 1
The efficiency of the first cycle of elements in a batch type
Designation The capacity of the 1st charge (mA∙h) Capacity 1-th digit (mA∙h) The Coulomb efficiency (%)
SLMP-1 91,45 84,46 92
SLMP-2 90,68 82.30 level 91
Basic-1 92,94 77,84 84
Base-2 91,54 73,84 81

Example 8

[0034] the separator Celgard® 3501 with an area of 64 cm2besieged 5 mg SLMP using suspension butadiene-styrene copolymer/BYK in toluene. After evaporation of the solvent separator is brought into contact with the electrode of MCMB-2528 (90%) + carbon black (3%) + PVdF (7%) with an area of 49 cm2. Then the package from the separator and the electrode was subjected to calandrinia. After calendering the MCMB electrode 228 and the separator is collected in a batch item type against the positive electrode of LiMn 2O4(90%) + carbon black (5%) + PVdF (5%). The electrolyte used a 1M solution LiPF6/EC+DEC (1:1) from the firm Novolyte. For comparison, gathered basic elements with the same configuration that does not contain SLMP. After assembling the elements of the batch tested on the device for Cycling Maccor series 4000. Used testing method was a CC 12 mA to 4.3 V, CV with a time step equal to 10 hours. The CC discharge at 12 mA to 3.0 Century Before the procedure, the Cycling of elements left to Mature for 5 hours, to allow time to complete the process prior litvinovna. Figure 2 shows voltage traces of the first cycle for the base and containing SLMP elements.

Example 9

[0035] On the copper foil with an area of 249 cm2besieged 100 mg SLMP using suspension butadiene-styrene copolymer/BYK in toluene. After evaporation of the solvent the copper foil was subjected to calandrinia, creating 26 mm layer of thin lithium foil on a copper foil. Then the copper current collector plus a thin lithium foil can be used as the negative electrode in the battery.

[0036] Having described thus certain implementations of the present invention, it should be clear that the invention defined by the appended claims should not be limited to the specific Podrobnosti the mi, set forth in the above description as possible of its many obvious variations without deviating from the essence or scope, as stated next.

1. The deposition method of the metal powder of lithium on a substrate without the use of solvent, consisting of the following stages:
(a) deposition of a powder of stabilized lithium metal on the carrier;
(b) bringing the carrier into contact with the substrate having a higher affinity for the metal powder of lithium compared with the affinity of the carrier for the powder metal lithium;
(c) the exposure of the substrate in contact with the carrier, the conditions sufficient to transfer deposited on the carrier powder of metallic lithium on a substrate; and
(d) separation of the carrier and the substrate to retain the powder of the metallic lithium deposited on the substrate.

2. The method according to claim 1, the carrier is an amorphous solid polymer, cellulose or metal.

3. The method according to claim 1, the substrate is a material selected from the group consisting of carbon materials, Li4Ti5O12, Si, Sn, Cu, SiO, oxides of tin, tin alloys, metal foil, conductive polymers, conductive ceramics, oxides of transition metals, nitrides of lithium-metal oxides, lithium metal, and mixtures thereof is whether composites.

4. The method according to claim 1, stage (C) conditions sufficient to transfer the lithium metal powder include the crushing of the carrier and the substrate to each other.

5. The method according to claim 4, when the substrate is a material selected from the group consisting of carbon materials, Li4Ti5O12, Si, Sn, Cu, SiO, oxides of tin, tin alloys, metal foil, conductive polymers, conductive ceramics, oxides of transition metals, nitrides of lithium-metal oxides, lithium metal, and their mixtures or composites.

6. The deposition method of the metal powder of lithium on a substrate without the use of solvent, consisting of the following stages:
(a) the precipitation of the formed powder stabilized lithium metal foil to the media;
(b) bringing the carrier into contact with the substrate having a higher affinity to the powder metal lithium foil compared to the affinity of the carrier for the powder metal lithium foil;
(c) the exposure of the substrate in contact with the carrier, the conditions sufficient to transfer deposited on the carrier foil of lithium metal powder on the substrate; and
(d) separation of the carrier and the substrate so as to keep the foil from a powder of metallic lithium deposited on the substrate.

7. The method according to claim 6, while Sitel is an amorphous solid polymer, cellulose or metal.

8. The method according to claim 6, the substrate is a material selected from the group consisting of carbon materials, Li4Ti5O12, Si, Sn, Cu, SiO, oxides of tin, tin alloys, metal foil, conductive polymers, conductive ceramics, oxides of transition metals, nitrides of lithium-metal oxides, lithium metal, and their mixtures or composites.

9. The method according to claim 6, stage (C) conditions sufficient to transfer the foil of lithium metal powder include the crushing of the carrier and the substrate to each other.

10. Media for lithium deposition of powder stabilized lithium metal on a substrate without the use of solvent, and said media lithium includes media and besieged it powder metal lithium, and the affinity of the carrier for the powder metal lithium is less than the affinity of lithium metal powder to the substrate.

11. Media for lithium deposition of powder stabilized lithium metal on a substrate without the use of solvent, and said media lithium includes the carrier and deposited on a thin foil of metal lithium, and the affinity of the carrier to the metal lithium thin foil is less than the affinity of metal lit the I to the substrate.

12. Method of forming a battery, including:
(a) forming an electrode from a material selected from the group consisting of carbon materials, Li4Ti5O12, Si, Sn, SiO, oxides of tin, tin alloys, metal foil, conductive polymers, conductive ceramics, oxides of transition metals, nitrides of lithium-metal oxides, lithium metal, and mixtures and composites;
(b) bringing the surface of the electrode in contact with a carrier of lithium, including the material of the carrier and deposited on it the powder of stabilized lithium metal, and the affinity of the carrier for the powder metal lithium is less than the affinity of lithium metal powder of the material of the electrode;
(c) removing the carrier from the electrode, and the lithium metal powder is deposited on the surface of the electrode; and
(d) applying an electrode having deposited thereon a metal lithium as a negative electrode (anode) when forming the battery.

 

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