Stabilized electrochemical cell active material

A lithium manganese oxide, spinel technology, used in the field of batteries and battery packs with lithium-based active materials

Inactive Publication Date: 2002-05-29
VALENCE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A method is described in pending PCT / US97 / 22525 (filed November 21, 1997) and US Patent Application No. 08 / 762,081 (filed December 9, 1996, now US Patent 5,869,207), Can effectively solve the problem of interaction between battery components and impurity water left in the battery

Method used

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  • Stabilized electrochemical cell active material
  • Stabilized electrochemical cell active material
  • Stabilized electrochemical cell active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

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[0052] Put two pieces of 48 cm 2 The electrode material is hot-pressed onto a metal mesh plate to form an electrochemical cell with negative electrode, separator and positive electrode film. Lamination was performed at 120°C and 50 psi. Copper grids are used for the negative electrode laminate and aluminum grids are used for the positive electrode. After initial lamination, the two electrodes and separator were laminated together by hot pressing at 115°C and 40 psi.

[0053] After lamination, three washes (20 minutes each) in a methanol bath extract the plasticizer and create porosity in the battery. After extraction, the cells were vacuum dried overnight at 40°C.

[0054] The electrolyte used for the battery is 2:1 ethylene carbonate and dimethyl carbonate (EC / DMC) with 1 molar concentration of LiPF as the conductive salt 6 (Grant-Ferro Corp., Zachary LA). A basic compound may also be added to the electrolyte solution. Therefore, a b...

Embodiment II

[0069] Example II: Treated LMO

[0070] Lithium manganese oxide spinel (LMO), a simple spinel whose specification is given in Table III, was obtained from Japan Energy Corporation as Japan Energy Corporation ISR 140B. The method of making all of the treated LMOs in some of the examples below included the following steps. The LMO and lithium carbonate were first mixed in a ball mill for 60 minutes. A small amount (1-2% by weight) of high-purity lithium carbonate particles with a particle size of about 5 microns is used. Such lithium carbonate is commercially available from Pacific Lithium, New Zealand. The use of large-sized ceramic ball milling media in the ball milling operation does not cause material abrasion. The medium is then removed from the mixture. Mixed Li 2 CO 3 / LMO was heated for 30 minutes in a box furnace set at 600-750°C. The treated material was removed from the furnace and immediately placed in a second chamber furnace set at 450°C for 1 hour. The fur...

Embodiment III

[0071] Example III: Use of cells treated with LMO

[0072] Solvent cast the paste containing MCMB2528 graphite, binder, plasticizer and casting solvent to manufacture graphite electrode. MCMB2528 is a mesoporous carbon microparticle supplied by Alumina Trading (Osaka Gas Company of Japan's US distributor) with a density of approximately 2.24 g / cm 3 ; at least 95% by weight of the particles have a maximum particle size of 37 microns, a median particle size of about 22.5 microns, and an interlayer distance of about 0.336. The binder is a copolymer of polyvinylidene fluoride (PVDF) and hexafluoropropylene (HFP), and the weight ratio of PVDF and HFP is 88:12. This adhesive is sold under the Kynar Flex trade name (indicating its registered trademark). Kynar Flex is commercially available from Atochem Corporation. Solvents are of electronic grade. The paste is cast on glass, and after the solvent evaporates, a self-supporting electrode is formed. The electrode composition was a...

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Abstract

Compositions and methods of making such compositions stabilized against loss of charge are provided, the compositions comprising spinel lithium manganese enriched in lithium due to decomposition products of lithium carbonate forming part of each particle of said composition Oxygen oxide (LMO), which has a reduced surface area compared to non-lithium-enriched spinel, improves the charge expressed in mAh/g.

Description

field of invention [0001] The present invention relates to electrochemical cells and batteries, and in particular, to cells and batteries having lithium-based active materials. Background of the invention [0002] Lithium batteries can be made from one or more cells. Such batteries include an oxidizing electrode (negative electrode), a reducing electrode (positive electrode), and an electrolyte between separated, electrically insulating positive and negative electrodes. The electrolyte is typically a lithium salt dissolved in one or more solvents, typically a non-aqueous (protic) solvent. During battery discharge, the negative electrode of the battery is conventionally defined as the oxide electrode. During battery use, lithium ions (Li + ) migrates to the negative electrode during charging. During discharge, lithium ions (Li + ) migrates from the negative electrode to the positive electrode. In subsequent charging and discharging, lithium ions (Li + ) migrate between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00H01M4/131H01M4/1391H01M4/50H01M4/505H01M4/62H01M10/0525H01M10/0567H01M10/36
CPCH01M10/0567H01M4/505C01G45/1242C01P2002/32C01P2002/77H01M4/62C01P2006/40C01P2004/51H01M10/0525H01M4/1391Y02E60/122H01M4/131C01G45/1221C01P2004/60Y02E60/10H01M4/36
Inventor J·巴克M·Y·赛义迪C·A·斯科迪利斯-凯利
Owner VALENCE TECH INC
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