The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2007
Filed:
Dec. 09, 2002
Atsuo Omaru, Fukushima, JP;
Takao Nirasawa, Fukushima, JP;
Atsuo Omaru, Fukushima, JP;
Takao Nirasawa, Fukushima, JP;
Sony Corporation, Tokyo, JP;
Abstract
A secondary battery which exhibits less deterioration of capacity, can maintain high energy densities in high temperature atmospheres, and has high practicality, and an electrolyte used therefor, are provided. The electrolyte contains an anion expressed by (PFQR), so degradation of the electrolyte can be prevented. In the formula, Q expresses at least one of CF, CF, and CF, and R expresses SOCFand/or SOCF. a, b and c satisfy 1≦a≦5, 0≦b≦5, and, 0≦c≦5, respectively. Furthermore, an anion expressed by N(CFSO)is contained, which can further prevent the degradation of the electrolyte. In the formula, n satisfies 1≦n≦2. Therefore, the capacity recovery rate after storage and heavy load discharge maintenance rate are high even in high temperature atmospheres, and high reliability can be obtained.