×

Overcharge protection of nonaqueous rechargeable lithium batteries by cyano-substituted thiophenes as electrolyte additives

  • US 20040053138A1
  • Filed: 09/12/2003
  • Published: 03/18/2004
  • Est. Priority Date: 09/16/2002
  • Status: Abandoned Application
First Claim
Patent Images

1. Rechargeable lithium battery having a maximum permissible cell voltage for use in the intended manner, comprising an anode comprising a material which is capable of incorporating lithium ions and releasing them again, a cathode comprising a material which is capable of releasing lithium ions and incorporating them again, a separator, a nonaqueous electrolyte comprising one or more solvents and one or more conductive salts optionally embedded in a polymeric gel matrix, characterized in that the nonaqueous electrolyte additionally comprises a thiophene of the general formula (I) in which R1 to R4, independently of one another, are H, C1-C18-alkyl, C1-C18haloalkyl, C1-C1 8-alkoxy, C1-C18-haloalkoxy, halogen or pseudohalogen, with the proviso that at least one of the radicals R1 to R4 is CN.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×