Asymmetric organic alkyl methyl carbonates for non-aqueous power

Details Asymmetric organic alkyl methyl carbonates for non-aqueous power Asymmetric organic alkyl methyl carbonates for non-aqueous power

1997-12-31

1999-11-30

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429342, 361504, H01M 1040, H01G 902

Patent

active

059940000

ABSTRACT:
Acyclic, asymmetric methyl alkyl carbonates, particularly for use with a carbonaceous, e.g., graphite, anode, in electrolytes suitable for portable power sources, are disclosed. Asymmetric alkyl carbonate solvents, having the general structural formula MeO--CO.sub.2 R, where R is larger than methyl, can be used as the only solvent in the non-aqueous electrolyte of a portable power source; no other solvent is necessary for superior performance in, e.g., high energy density lithium ion batteries or high power electrochemical capacitors. Furthermore, an asymmetric alkyl methyl carbonate can serve as the primary solvent for a non-aqueous electrolyte, i.e., the solvent providing the requisite properties, with the appropriate volume balance being made up with a combination of cyclic and acyclic carbonates or esters chosen for a particular application.

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