Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes, etc., can solve the problems of reduced output characteristics, service life characteristics, increased battery expansion, and reduced charge-discharge cycle life characteristics.

Active Publication Date: 2008-03-12
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in LiPF 6 Mixed LiBF 4 In the case of use, even a very small amount of mixing will cause the problem of increased battery expansion when left at high temperature and the problem of greatly reduced output characteristics (charge-discharge cycle life characteristics) accompanying charge-discharge cycles.
In particular, the degradation of charge-discharge cycle life characteristics is a relatively big problem
In addition, when combining LiFOB or LiBOB with LiPF 6 Mixed use case also with LiBF 4 same, produces the problem described

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0067] FIG. 1 is a cross-sectional view showing a configuration example of a nonaqueous electrolyte secondary battery of the present invention. In Fig. 1, 1 is a square non-aqueous electrolyte secondary battery (hereinafter referred to as a battery), 2 is an electrode group, 3 is a negative pole, 4 is a positive pole, 5 is a diaphragm, 6 is a battery case, 7 is a battery cover, and 8 is a Safety valve, 9 is the negative terminal, and 10 is the negative lead. The electrode group 2 is formed by winding a negative electrode 3 and a positive electrode 4 in a flat shape with a separator 5 interposed therebetween. The electrode group 2 and the electrolytic solution (electrolyte) are housed in the battery case 6 , and the opening of the battery case 6 is sealed by laser welding a battery cover 7 provided with a safety valve 8 . The negative electrode terminal 9 is connected to the negative electrode 3 via the negative electrode lead 10 , and the positive electrode 4 is connected to ...

Embodiment 2

[0072] The same battery as in Example 1 was produced except that the BP added to the electrolytic solution was 0.5% by mass.

Embodiment 3

[0074] The same battery as in Example 1 was produced except that the BP added to the electrolytic solution was 4% by mass.

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Abstract

Disclosed is a nonaqueous electrolyte secondary battery comprising a positive electrode containing a lithium complex oxide, a negative electrode which adsorbs / discharges lithium and an electrolyte, wherein not less than 0.1% by mass and not more than 2% by mass of one or more compounds selected from the group consisting of LiFOB and LiBOB or not less than 0.01% by mass and not more than 2% by mass of LiBF4 as well as not less than 0.1% by mass and not more than 4% by mass of an aromatic compound, respectively relative to the total mass of the electrolyte, are added to the electrolyte for the purpose of suppressing deterioration of charge / discharge cycle characteristics and battery leakage when left in high temperature environments.

Description

technical field [0001] The invention relates to a non-aqueous electrolyte secondary battery comprising a positive electrode containing lithium composite oxide, a negative electrode for absorbing and releasing lithium, and an electrolyte. Background technique [0002] LiPF is generally used as an electrolyte salt for lithium-ion batteries 6 . In addition, LiBF is also used as another electrolyte salt 4 , also available in LiPF 6 Mixed LiBF 4 and used (for example, refer to Patent Document 1). In the LiPF 6 and LiBF 4 In the case of mixed use, the electrochemical stability is high, and high conductivity can be exhibited in a wide temperature range. In addition, LiFOB represented by formula (1), LiBOB represented by formula (2), and the like have also been proposed as lithium salts containing boron. [0003] [0004] [Patent Document 1] JP-A-2004-103433 [0005] However, in LiPF 6 Mixed LiBF 4 In the case of use, even a very small amount of mixing will cause the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M4/58H01M4/131H01M4/133H01M4/485H01M4/587H01M10/05H01M10/052H01M10/0525H01M10/0567H01M10/0568
CPCY02E60/122H01M10/0567H01M10/4235H01M10/0587H01M10/0525Y02E60/10H01M4/58H01M10/05
Inventor 村井哲也
Owner GS YUASA INT LTD
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