Lithium secondary battery

一种锂二次电池、电池端子的技术，应用在二次电池、锂蓄电池、非水电解质蓄电池等方向，能够解决未确认到循环特性的提高等问题，达到抑制气体产生量、提高循环特性的效果

Active Publication Date: 2008-06-18
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the electrolytic solution containing cyclohexylbenzene disclosed in Patent Document 1, as shown in the comparative example described later, no improvement in cycle characteristics at 4.4 V was confirmed.

Method used

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Examples

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Effect test

Embodiment 1-1

[0470] Dissolved in a mixed solvent (mixing volume ratio 1:3) of ethylene carbonate (EC) as a cyclic carbonate and ethylmethyl carbonate (EMC) as a chain carbonate in a ratio of 1 mol / L as Electrolyte LiPF 6 , to obtain a basic electrolyte solution (1-I), in the basic electrolyte solution (1-I), add vinyl ethylene carbonate as a derivative of vinyl ethylene carbonate and as a derivative of vinylene carbonate Vinylene carbonate was used so that their concentrations relative to the non-aqueous electrolytic solution were 2% by weight and 2% by weight, respectively, to prepare a non-aqueous electrolytic solution.

[0471] Using the obtained non-aqueous electrolytic solution, a lithium secondary battery was fabricated according to the above method, and the 4.4V cycle characteristics were evaluated. The results are shown in Table 1-1. In addition, in Table 1-1, the numerical values ​​described in parentheses in the column of vinyl ethylene carbonate derivative, vinylene carbonate ...

Embodiment 1-2

[0473] In the basic electrolytic solution (1-I), vinyl ethylene carbonate as a derivative of vinyl ethylene carbonate and vinylene carbonate as vinylene carbonate are added such that their concentrations relative to the nonaqueous electrolytic solution 0.5% by weight and 1% by weight, respectively, using the non-aqueous electrolytic solution obtained in this way, a lithium secondary battery was produced according to the above-mentioned method, and the 4.4V cycle characteristics were evaluated. The results are shown in Table 1-1.

Embodiment 1-3

[0475] In the basic electrolytic solution (1-I), vinyl ethylene carbonate as a derivative of vinyl ethylene carbonate and vinylene carbonate as vinylene carbonate are added such that their concentrations relative to the nonaqueous electrolytic solution 1% by weight and 1% by weight, respectively, using the non-aqueous electrolytic solution obtained in this way, a lithium secondary battery was produced according to the above-mentioned method, and the 4.4V cycle characteristics were evaluated. The results are shown in Table 1-1.

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Abstract

The invention provides a lithium secondary battery that exhibits a high open-circuit voltage between battery contacts at the completion of electric charge, being capable of suppressing the rate of gas generation during continuous electric charge, and that excels in cycle characteristics. For providing such a lithium secondary battery, in the electrolyte, there is incorporated a vinyl ethylene carbonate derivative together with a vinylene carbonate derivative; or incorporated 0.01 to 5 wt.% of any of lactones having a substituent at its a-position; or incorporated 0.01 to 5 wt.% of any of lactones having a carbon to carbon unsaturated bond; or incorporated a sulfonate compound of the formula: wherein L is a bivalent linkage group composed of carbon and hydrogen atoms, and R<30> each independently are unsubstituted or fluorine-substituted aliphatic saturated hydrocarbon groups.

Description

technical field [0001] The invention relates to a lithium secondary battery using a non-aqueous electrolyte. Background technique [0002] Lithium secondary batteries have the advantages of high energy density and low self-discharge. Therefore, in recent years, it has been widely used as a power source for civilian portable devices such as mobile phones, notebook computers, and PDAs. [0003] Conventional electrolyte solutions for lithium secondary batteries consist of a lithium salt as a supporting electrolyte and a non-aqueous solvent. The nonaqueous solvent used here is required to have high conductivity to dissociate the lithium salt, exhibit high ion conductivity over a wide temperature range, and be stable in batteries. Since it is difficult to meet these requirements with one solvent, high boiling point solvents such as propylene carbonate and ethylene carbonate are usually combined with low boiling point solvents such as dimethyl carbonate and diethyl carbonate to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/052H01M10/0567H01M10/36
CPCH01M10/4235Y02E60/122H01M10/052H01M10/0567Y02E60/10
Inventor 大贯正道木下信一
Owner MITSUBISHI CHEM CORP
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