Lithium secondary battery and cathode active material for...

Details Lithium secondary battery and cathode active material for... Lithium secondary battery and cathode active material for...

H - Electricity

01

M

H01M 4/32 (2006.01) H01M 4/52 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2222529

A lithium secondary battery comprising: a cathode including, as an active material, a material that can be doped/undoped with lithium ions; an anode including, as an active material, a lithium metal, a lithium alloy or a material that can be doped/undoped with lithium ions; and a liquid or solid electrolyte, wherein lithiated nickel dioxide containing aluminum is used as said cathode active material, and wherein a molar ratio x of aluminum to the sum of aluminum and nickel in said lithiated nickel dioxide containing aluminum is in the range of 0.10<x<0.20. The lithium secondary battery has an excellent cycle characteristic even in cycles of charging/discharging processes at a high capacity and an enhanced safety in a charged state.

Pile secondaire au lithium comprenant : une cathode contenant en tant que matière active, un matériau pouvant être dopé/non dopé par des ions de lithium; une anode contenant en tant que matière active, un métal lithium, un alliage de lithium ou un matériau pouvant être dopé/non dopé par des ions de lithium, et une électrolyte liquide ou solide, dans laquelle le dioxyde de nickel lithiaté contenant de l'aluminium est utilisé comme matière active de la cathode, et dans laquelle le rapport molaire x de l'aluminium sur la somme de l'aluminium et du nickel (Al/Al + Ni) présents dans le dioxyde de nickel lithié renfermant de l'aluminium est dans la plage 0,10<x<0,20. La pile secondaire au lithium possède une excellente caractéristique de cycle même pour les cycles de charge/décharge à haute capacité et une meilleure sécurité à l'état chargé.

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