Electrolyte system for lithium batteries, the use thereof, and method for enhancing the safety of lithium batteries

US6677085B2 · kind B2 · utility

Assignee

• SOLVAY FLUOR und DERIVATE GmbH · DE

Inventors

• Wolfgang Appel · Kelkheim, DE
• Sergej Pasenok · Kelkheim, DE
• Juergen Besenhard · Graz, AT
• Lars Henning Lie · Halden, NO
• Martin Winter · Munster, DE

Key dates

• Filing date: Jun 19, 2001
• Grant date: Jan 13, 2004
• Expiry date: Feb 26, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49108
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electrolyte system for lithium batteries with enhanced safety. The system contains at least one conductive salt containing lithium and at least one electrolyte liquid. The electrolyte liquid contains an effective amount of a partially fluorinated compound derived from a diol corresponding to the formula (I):R1CO—O—[CHR3(CH2)m—O]n—R2  (I)in which R1 is a (C1-C8)-alkyl or (C3-C8)-cycloalkyl group, and each R1 group is partially fluorinated or perfluorinated so that at least one hydrogen atom of the group is replaced by fluorine; R2 is a (C1-C8)-alkylcarbonyl or (C3-C8)-cycloalkylcarbonyl group, and each R2 group may optionally be partially fluorinated or perfluorinated; R3 is a hydrogen atom or a (C1-C8)-alkyl or (C3-C8)-cycloalkyl group; m is 0, 1, 2 or 3; and n is 1, 2 or 3.