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Nonaqueous electroulyte secondary battery and electrolyte used in battery

A non-aqueous electrolyte and secondary battery technology, applied in the field of electrolytes, can solve the problems of reduced charge and discharge characteristics, increased battery polarization resistance, etc.

Inactive Publication Date: 2004-05-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, GBL and LiPF 6 , the reaction occurs at high temperature, which increases the polarization resistance of the battery, so the charge and discharge characteristics decrease

Method used

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  • Nonaqueous electroulyte secondary battery and electrolyte used in battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Production of positive electrode

[0044] In 100 parts by weight active material lithium cobaltate (LiCoO 2 ), add and mix 3 parts by weight of acetylene carbon black as a conductive agent, 4 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVdF) as a binder, and an appropriate amount of N-methyl-2-pyrrolidone (hereinafter referred to as Referred to as NMP), to obtain a paste positive electrode mixture. PVdF is pre-dissolved in NMP and mixed with other ingredients. The positive electrode mixture in paste form was coated on both sides of a current collector made of titanium foil, dried, and rolled as a whole to obtain a positive electrode.

[0045] (2) Production of negative electrode

[0046] In 100 parts by weight of the active material non-graphitizable carbon (Cabotron P produced by Kureha Chemical Industry Co., Ltd.), an aqueous solution of styrene butadiene rubber in 3 parts by weight of the resin was added as a binder. The dispersion ...

Embodiment 2

[0055] The same nonaqueous electrolyte as in Example 1 was prepared except that 2 parts by weight of VC was added as an additive with respect to 100 parts by weight of GBL. Using this non-aqueous electrolyte, a battery similar to that of Example 1 was produced except that flake graphite was used instead of non-graphitizable carbon as the negative electrode active material. This battery was used as the battery of Example 2.

Embodiment 3

[0057] For non-aqueous solvents, use GBL alone. For the solute, use LiFSI and LiPF in a molar ratio of 7:3 6 . Here, in GBL, dissolve LiFSI at a concentration of 0.7 mol / L and dissolve LiPF at a concentration of 0.3 mol / L 6 , prepared as a non-aqueous electrolyte. Using this non-aqueous electrolyte, a battery similar to that of Example 2 was produced except that aluminum foil was used as a positive electrode current collector instead of titanium foil. This battery was used as the battery of Example 3.

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PUM

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Abstract

The present invention provides a safe non-aqueous electrolyte secondary battery with characteristics analogous to those of a conventional battery by minimizing battery expansion that causes damage to a device during high temperature exposure or storage. The non-aqueous electrolyte secondary battery comprises: (a) a chargeable and dischargeable positive electrode; (b) a negative electrode capable of absorbing and desorbing lithium; (c) a separator for preventing direct electron transfer between the positive electrode and the negative electrode; and (d) an non-aqueous electrolyte; the non-aqueous electrolyte comprising a non-aqueous solvent and a solute, the non-aqueous solvent comprising a lactone, the solute comprising lithium bis(fluorosulfonyl)imide represented by the formula (1): (F-O2S-N-SO2-F)Li.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery and an electrolyte used in the battery. Background technique [0002] In recent years, information electronic equipment such as personal computers, portable phones, and PDAs, and audio-visual electronic equipment such as video camcorders and compact disk players have been rapidly reduced in size, weight, and cordlessness. Accompanying this progress, the demand for a secondary battery having a high energy density is also increasing as a power source for driving these electronic devices. Under such circumstances, the practical use of non-aqueous electrolyte secondary batteries having a high energy density that cannot be achieved by conventional secondary batteries such as lead storage batteries, nickel-cadmium storage batteries, and nickel-metal hydride storage batteries is being promoted. [0003] In non-aqueous electrolyte secondary batteries represented by lithium-ion second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/36
CPCH01M10/0567H01M6/168Y02E60/122H01M6/166H01M2300/0025H01M10/0568H01M10/0525H01M10/0569Y02E60/10
Inventor 三重久美子越名秀松井彻出口正树
Owner PANASONIC CORP
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