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Non-aqueous electrolytic solution secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of not realizing sufficient characteristics of the positive active material, LiFeO2 is difficult to prepare, and the structure is unstable. Achieve good life characteristics, reduce water content value, and prevent the reduction of life

Active Publication Date: 2009-02-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiFeO 2 Difficult to prepare and structurally unstable, and has not yet achieved sufficient characteristics as a positive electrode active material for lithium-ion secondary batteries

Method used

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  • Non-aqueous electrolytic solution secondary battery
  • Non-aqueous electrolytic solution secondary battery
  • Non-aqueous electrolytic solution secondary battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] 90 parts by weight of LiFePO with an olivine crystal structure as the positive electrode active material 4 , 5 parts by weight of polyvinylidene fluoride as a binder and 5 parts by weight of graphite as a conductive agent were mixed to prepare a positive electrode mixture. This positive electrode mixture was dispersed in N-methyl-2-pyrrolidone as a solvent to form a slurry. This positive electrode mixture slurry was applied to both surfaces of a strip-shaped aluminum foil having a thickness of 15 μm as a positive electrode collector, dried, and then compression-molded by a roll press to obtain a strip-shaped positive electrode.

[0065] 90 parts by weight of graphite as a negative electrode active material and 10 parts by weight of polyvinylidene fluoride PVdF as a binder were mixed to prepare a negative electrode mixture. This negative electrode mixture was dispersed in N-methyl-2-pyrrolidone as a solvent to form a slurry. This anode mixture slurry was applied to bot...

example 2

[0069] A cylindrical battery was prepared in the same manner as in Example 1, except that the amount of FEC added was changed to 0.1% by mass.

example 3

[0071] A cylindrical battery was prepared in the same manner as in Example 1, except that the amount of FEC added was changed to 10% by mass.

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Abstract

A non-aqueous electrolytic solution secondary battery includes a positive electrode containing, as a positive electrode active material, a compound represented by the following general formula, LixFe1-yMyPO4, wherein M is at least one member selected from the group consisting of Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, V, Ti, Mg, Ca and Sr; 0.9<x<1.2; and 0<=y<0.3; a negative electrode containing a lithium metal, a lithium alloy or a material capable of doping and dedoping lithium; and a non-aqueous electrolytic solution, the non-aqueous electrolytic solution containing a fluorinated ethylene carbonate FEC.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP 2007-216831 filed in the Japan Patent Office on Aug. 23, 2007, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention provides a nonaqueous electrolyte secondary battery having excellent life characteristics. Background technique [0004] In recent years, with the tremendous development of various electronic devices, researches on rechargeable secondary batteries are also being conducted as power sources that can be used conveniently and economically for a long period of time. As representative secondary batteries, lead storage batteries, alkaline storage batteries, and nonaqueous electrolyte secondary batteries are known. [0005] Among the foregoing secondary batteries, particularly lithium ion secondary batteries as nonaqueous electrolyte secondary batteries have advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/58H01M4/48H01M4/38H01M10/052H01M10/0525H01M10/0567H01M10/0568
CPCY02E60/12H01M10/0567Y02E60/122H01M10/0568H01M4/405H01M4/5825H01M4/382H01M4/38H01M4/386H01M4/387Y02E60/10
Inventor 长谷川稔福岛弦李国华石井武彦仓塚真树
Owner MURATA MFG CO LTD