Diol diesters and alkoxyalkylesters as solvents for nonaqueous battery electrolytes
US5219683A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1992 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Mar 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01M6/164
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.