Ratner & Prestia
Secondary battery including an electrolytic solution with an organic additive
 A battery excellent in high temperature storage characteristic is presented. It comprises a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode material, a nonaqueous solvent, and an electrolytic solution containing at least one of organic compounds expressed in formula 1 and formula 2. The positive electrode active material has an oxide compound containing a lithium atom, and the negative electrode material has a material capable of storing and releasing a lithium ion. Formula 1 ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4 are individually at least one selected from the group consisting of H, aryl group, and aryl group having a functional group containing a substituent having an electron attracting property, and the number of H is three or less. Formula 2 ##STR2## 
Matsushita Electric Industrial Co., Ltd.
H Y H H H H H H Y Y H H H
H01M Y02P H01M H01M H01M H01M H01M H01M Y02E Y02T H01M H01M H01M
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Jun Hizuru Shoichiro Kazuya Atsushi
Nunome Koshina Watanabe Iwamoto Ueda