Additives for non-aqueous electrolyte and lithium secondary...

Details Additives for non-aqueous electrolyte and lithium secondary... Additives for non-aqueous electrolyte and lithium secondary...

2011-04-19

2011-04-19

Yuan, Dah-Wei D (Department: 1727)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

C429S326000, C429S200000

Reexamination Certificate

active

07927747

ABSTRACT:
Disclosed is an electrolyte for batteries, comprising: (a) an electrolyte salt; (b) an organic solvent; (c) a first compound having an oxidation initiation voltage (vs. Li/Li+) higher than the operating voltage of a cathode; and (d) a second reversible compound having an oxidation initiation voltage higher than the operating voltage of the cathode, but lower than the oxidation initiation voltage of the first compound. Also disclosed is a lithium secondary battery comprising said electrolyte. In the lithium secondary battery, two compounds having different safety improvement actions at a voltage higher than the operating voltage of the cathode are used in combination as electrolyte components. Thus, the safety of the secondary battery in an overcharged state can be ensured, and at the same time, the deterioration of the battery can be prevented from occurring when it is repeatedly cycled, continuously charged and stored at high temperature for a long time.

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International Search Report dated May 4, 2007 for Application No. PCT/KR2007/000276 (All references cited in Search Report are listed above).
Chinese Office Action dated Dec. 18, 2009.

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