Overcharge protection of nonaqueous rechargeable lithium batteries by cyano-substituted thiophenes as electrolyte additives
First Claim
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.
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Accused Products
Abstract
The invention relates to the use of cyano-substituted thiophenes as electrolyte additives for protecting nonaqueous, rechargeable lithium batteries from overcharging, and lithium batteries comprising these additives.
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Citations
19 Claims
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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.
Specification