Diol diesters and alkoxyalkylesters as solvents for nonaqueous b

Details Diol diesters and alkoxyalkylesters as solvents for nonaqueous b Diol diesters and alkoxyalkylesters as solvents for nonaqueous b

1992-03-06

1993-06-15

Pal, Asok

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429194, 429218, H01M 614

Patent

active

052196836

ABSTRACT:
A new class of low flammability solvents for use in the electrolyte of a nonaqueous battery comprising a compound of the general formula ##STR1## in which R is a C.sub.1 -C.sub.10 alkyl group, X is a C.sub.1 -C.sub.8 acyclic group which can be linear, branched, saturated or unsaturated and Y is a C.sub.1 -C.sub.10 alkyl group or a carbonyl group O ##STR2## in which R' is a C.sub.1 -C.sub.10 alkyl group. When Y is a carbonyl group a class of diesters is disclosed which are prepared from a dihydroxy alcohol and two molecules of a monocarboxylic acid. When Y is a C.sub.1 -C.sub.10 alkyl group a class of ether-esters is disclosed. The preferred solvents are ethylene glycol diacetate and 2-ethoxyethylacetate. The solvents are preferably used in combination with a cosolvent such as propylene carbonate and most preferably employ additions of more volatile ether cosolvents such as dimethoxyethane or 1,3-dioxolane for increased discharge performance. Soluble salts used in the electrolyte solution are, for example, LiCF.sub.3 SO.sub.3 LiBF.sub.4. The preferred lithium salt is LiCF.sub.3 SO.sub.3.

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Aldrich Catalog/Handbook (1984-1985).

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