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Nonaqueous electrolytic solution and lithium secondary battery

A technology of non-aqueous electrolyte and electrolyte solution, which is applied in the direction of secondary batteries, circuits, electrical components, etc., and can solve problems such as deterioration of battery characteristics, reduction of gas production, and insufficient cycle characteristics.

Active Publication Date: 2007-11-07
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In the lithium secondary battery disclosed in Patent Document 1, the electrolyte solution used is made by adding LiPF 6 Formed by dissolving in a non-aqueous solvent containing (1) ethylene carbonate, (2) ethylmethyl carbonate and (3) vinylene carbonate, however, it does not contribute to the reduction of capacity during continuous charging and the reduction of gas production basically have no effect, although it can improve the cycle characteristics
[0013] Furthermore, in the secondary battery disclosed in Patent Document 2, a 6 and LiBF 4 As an electrolyte solution of a lithium compound, however, when the battery is stored at a high temperature of 80°C or higher, the battery characteristics deteriorate and the cycle characteristics are not sufficient
[0014] Also, in the secondary battery disclosed in Patent Document 3, an electrolytic solution containing a specific cyclic imide salt as a lithium compound is used, however, when it is prepared as a battery having a high capacity, not all storage characteristics , cycle characteristics, and continuous charging characteristics can all be maintained at a high level at the same time, and in particular, when the battery is stored under high temperature conditions, the battery characteristics are reduced, although aluminum can be prevented from being corroded

Method used

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  • Nonaqueous electrolytic solution and lithium secondary battery
  • Nonaqueous electrolytic solution and lithium secondary battery
  • Nonaqueous electrolytic solution and lithium secondary battery

Examples

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Embodiment 1

[0123] Under a dry argon atmosphere, 2 parts by weight of vinylene carbonate was added to 98 parts by weight of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and diethyl carbonate (volume ratio: 2 / 4 / 2 / 2) in the mixture, the fully dried LiPF 6 LiBF 4 dissolved therein so that their respective ratios were 1.0 mol / L and 0.05 mol / L, respectively, to prepare electrolytic solutions.

[0124] Cylindrical lithium secondary batteries were prepared using the electrolytic solutions thus prepared, and characteristics after continuous charging and cycle characteristics were evaluated. The results are shown in Table 1.

Embodiment 2

[0126] Add 2 parts by weight of vinylene carbonate to a mixture of 98 parts by weight of ethylene carbonate and ethyl methyl carbonate (volume ratio: 2 / 8), and fully dry LiPF 6 LiBF 4 dissolved therein so that their respective ratios were 1.0 mol / L and 0.05 mol / L, respectively, to prepare electrolytic solutions.

[0127] Cylindrical lithium secondary batteries were prepared using the electrolytic solutions thus prepared, and characteristics after continuous charging and cycle characteristics were evaluated. The results are shown in Table 1.

Embodiment 3

[0129] Add 2 parts by weight of vinylene carbonate to a mixture of 98 parts by weight of ethylene carbonate and diethyl carbonate (volume ratio: 2 / 8), and fully dry LiPF 6 LiBF 4 dissolved therein so that their respective ratios were 1.0 mol / L and 0.05 mol / L, respectively, to prepare electrolytic solutions.

[0130] Cylindrical lithium secondary batteries were prepared using the electrolytic solutions thus prepared, and characteristics after continuous charging and cycle characteristics were evaluated. The results are shown in Table 1.

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Abstract

An object of the invention is to provide such a battery that has a high capacity, is excellent in storage characteristics, cycle characteristics and continuous charging characteristics, and is small in gas generation amount, whereby size reduction and improvement in performance of a lithium secondary battery can be attained. The present invention relates to a nonaqueous electrolytic solution comprising a lithium salt and a nonaqueous solvent dissolving the same, wherein the electrolytic solution contains, as the lithium salt, LiPF6 in a concentration of from 0.2 to 2 mole / L, and LiBF4 and / or a compound represented by the following formula (1) in a molar ratio of from 0.005 to 0.4 with respect to LiPF6, and the nonaqueous solvent mainly comprises (1) ethylene carbonate and / or propylene carbonate, (2-1) a symmetric linear carbonate, (2-2) an asymmetric linear carbonate, and (3) vinylene carbonate.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte solution and a lithium secondary battery using it. More specifically, the present invention relates to a lithium secondary battery that has a high capacity and is excellent in storage characteristics, cycle characteristics and sustained discharge characteristics, and generates a small amount of gas. Background technique [0002] In recent years, lithium secondary batteries having high energy density have been developed as electrical appliances decrease in weight and size. [0003] Generally, an electrolyte solution used in a lithium secondary battery is mainly composed of a lithium salt and a non-aqueous solvent. Examples of the main component of the nonaqueous solvent include cyclic carbonates such as ethylene carbonate and propylene carbonate; chain carbonates such as dimethyl carbonate and ethylmethyl carbonate; and cyclic carboxylates such as γ-butyrol Esters and g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40
CPCH01M10/0564Y02E60/12Y02E60/10
Inventor 古田土稔木下信一岛邦久
Owner MITSUBISHI CHEM CORP