Secondary battery and electrolyte used therefor

Details Secondary battery and electrolyte used therefor Secondary battery and electrolyte used therefor

2007-05-22

2007-05-22

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

C429S188000, C429S303000, C429S231950, C429S199000, C429S316000, C429S144000

Reexamination Certificate

active

10314807

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 (PFaQbRc)−, so degradation of the electrolyte can be prevented. In the formula, Q expresses at least one of CF3, C2F5, and C3F7, and R expresses SO2CF3and/or SO2C2F5. a, b and c satisfy 1≦a≦5, 0≦b≦5, and, 0≦c≦5, respectively. Furthermore, an anion expressed by N(CnF2n+1SO2)2−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.

REFERENCES:
patent: 6696202 (2004-02-01), Arai
patent: 6730439 (2004-05-01), Kamei et al.
patent: 6815121 (2004-11-01), Dasgupta et al.
patent: 2002/0146621 (2002-10-01), Yageta et al.

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