NONAQUEOUS ELECTROLYTE BATTERY

Japanese Patent JP3439084

B2

PROBLEM TO BE SOLVED: To provide an electrolyte which restrains self-discharge when a battery is preserved and whose preserving characteristic is improved by including a specific quantity of dioxolane in an organic solvent containing oxygen acid ester.
SOLUTION: At least one kind of oxygen acid ester selected from a group of phosphoric ester, boric acid ester and titanic acid ester is included in an organic solvent containing dioxolane ≥10 wt.%. When a nonaqueous electrolyte composed of this organic solvent and a solute is used, the oxygen acid ester reacts with lithium in the presence of dioxolane to form a good quality coating film on a negative electrode. Since this coating film restrains direct contact of lithium with the solvent, the decomposition of the nonaqueous electrolyte is restrained. Trimethyl phosphate is thought to easily form an optimal coating film on the negative electrode or to be easily attracted on the negative electrode in the oxygen acid ester, and a self-discharge rate is further restrained.

JP5209649	Malonic acid nitrile derivative anionic salts, and their use as ionic conductive materials
WO/2001/052340	NEW ELECTROLYTES AND LITHIUM ION BATTERY USING THE SAME
JP4236390	Lithium secondary battery

Yasuyuki Kuzumoto
Seiji Yoshimura
Toshiyuki Noma
Koji Nishio

JP21087097A

August 25, 2003

August 05, 1997

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Sanyo Electric Co., Ltd.

H01M6/16; H01M10/05; H01M10/052; H01M10/0567; H01M10/0569; (IPC1-7): H01M6/16; H01M10/40

JP864240A
JP8115728A
JP62117271A

Masamasa Shibano

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