Electrolyte for lithium secondary battery comprising...

H - Electricity – 01 – M

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H01M 10/056 (2010.01)

Patent

CA 2632868

Disclosed herein is an electrolyte for lithium secondary batteries comprising: a chelating agent, which forms complexes with transition metal ions in the battery, and at the same time does not react and coordinate with lithium ions; a non-aqueous solvent; and an electrolyte salt, as well as a lithium secondary battery comprising the electrolyte. The chelating agent, which is contained in the electrolyte for lithium secondary batteries, can suppress a side reaction in which transition metal ions are reduced and deposited as transition metals on the anode. Also, the chelating agent can suppress internal short-circuits in the battery and the resulting voltage drop of the battery and a reduction in the safety and performance of the battery, which can occur when transition metals are deposited on the anode.

L'invention concerne un électrolyte pour accumulateurs auxiliaires au lithium comprenant un agent chélateur qui forme des complexes avec des ions de métal de transition dans l'accumulateur sans réagir et se lier avec les ions lithium, un solvant non aqueux, et un sel électrolytique, ainsi qu'un accumulateur secondaire au lithium contenant cet électrolyte. L'agent chélateur présent dans l'électrolyte des accumulateurs auxiliaires au lithium peut permettre d'éviter une réaction secondaire avec réduction des ions métalliques de transition et dépôt de ces derniers sur l'anode sous forme de métaux de transition. De plus, la présence de l'agent chélateur peut permettre de supprimer les courts-circuits internes et la baisse de tension qui en résulte, ainsi qu'une diminution de la sécurité et des performances de l'accumulateur pouvant se produire par suite des dépôts de métaux de transition sur l'anode.

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