Lithium secondary battery and non-aqueous electrolytic solution

Details Lithium secondary battery and non-aqueous electrolytic solution Lithium secondary battery and non-aqueous electrolytic solution

H - Electricity

01

M

H01M 10/0564 (2010.01) H01M 4/131 (2010.01) H01M 4/133 (2010.01) H01M 4/525 (2010.01) H01M 4/52 (2006.01) H01M 4/62 (2006.01)

Patent

CA 2424735

The sudden generation of heat being frequently caused in the case of the overcharge of a lithium secondary cell which have a positive electrode comprising a composite metal oxide of lithium and cobalt or a composite metal oxide of lithium and nickel, a negative electrode comprising metallic lithium, a lithium alloy or a material capable of occluding and releasing lithium, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and an electrolyte dissolved therein can be efficiently prevented by the addition, to the nonaqueous electrolyte solution, of an organic compound which, when the lithium secondary cell is overcharged, decomposes into a decomposition product capable of dissolving out the cobalt or nickel contained in the positive electrode and depositing it ion the negative electrode (for example, a tert-alkylbenzene derivative).

Il est possible de prévenir efficacement la production brusque de chaleur fréquemment associée à une surcharge de pile secondaire au lithium équipée d'une électrode positive à base d'oxyde métallique composite de lithium et de cobalt ou d'oxyde métallique composite de lithium et de nickel, d'une électrode négative à base de lithium métallique, d'alliage au lithium ou de matériau capable d'occlusion et de libération sur le lithium, avec solution électrolytique non aqueuse renfermant un solvant non aqueux et un électrolyte dissous. Pour ce faire, on ajoute à la solution considérée un composé organique qui, en cas de surcharge de la pile, se décompose en donnant un produit capable d'extraire par dissolution le cobalt ou le nickel se trouvant dans l'électrode positive et de déposer ce cobalt ou ce nickel sur l'électrode négative (par exemple, sous la forme de dérivé tert-alkylbenzène).

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