【発明の名称】リチウム二次電池 - NIPPON TELEGRAPH & TELEPHONE

Title:

【発明の名称】リチウム二次電池

Document Type and Number:

Japanese Patent JPH0616420

Kind Code:

B2

Abstract:

PURPOSE:To improve the characteristic of charge and discharge, by using a solvent which is a mixture of 2,5-dimethyltetrahydrofuran and a compound having a polar double bond of >C=0 and/or >S=0, at a prescribed volume ratio, for an electrolytic solution, and by controlling the quantities of water and impurities. CONSTITUTION:The main constituent of an organic solvent for an electrolytic solution in which a lithium salt is dissolved in the solvent is a mixed solvent comprising 2,5-dimethyltetrahydrofuran and at least one of compounds having a polar double bond of >C=0 and/or >S=0, at a volume ratio of 90-40%. For example, the compounds having the polar double bond of >C=0 and/or >S=0 is ethylene carbonate, propylene carbonate, gamma-butylolactone and gamma- valerolactone. The water content and non-water impurity content of the electrolytic solution are not more than 400ppm and 25,000ppm, respectively.

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Inventors:

TOBISHIMA SHINICHI
ARAKAWA MASAYASU
HIRAI TOSHIRO
YAMAKI JUNICHI

Application Number:

JP6302086A

Publication Date:

March 02, 1994

Filing Date:

March 20, 1986

Export Citation:

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Assignee:

NIPPON TELEGRAPH & TELEPHONE

International Classes:

H01M4/48; H01M10/05; H01M10/0568; H01M10/0569; (IPC1-7): H01M10/40

Domestic Patent References:

JP60154478A

Other References:

吉沢四郎監修「電池ハンドブック」（昭５０−４−１５）電気書院第３章Ｐ．１６５電気化学、５３［１２（１９８５）鳶島、山本、Ｐ．９９５−９９６

Attorney, Agent or Firm:

Amamiya Masaki

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