Lithium-ion secondary battery
AssigneeNEC Corporation
InventorsJiro Iriyama, Kenichi Shimura, Kazuhiko Inoue
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Abstract
Lithium ion secondary batteries are disclosed that include a positive electrode comprising a lithium nickel composite oxide as a positive electrode active material and a separator consisting of one or more layers selected from polyimide layer, polyamide layer, the battery having a low self-discharge failure rate even after long term storage. The lithium ion secondary batteries can include a positive electrode comprising a lithium nickel composite oxide and a separator consisting of one or more layers selected from polyimide layer, polyamide layer, and polyamide imide layer, wherein the battery comprises an acid and/or an acid anhydride in an electrolyte solution and/or a member in contact with the electrolyte solution.
Claims13
A lithium ion secondary battery comprising
- a positive electrode comprising a positive electrode active material comprising a lithium nickel composite oxide represented by formula (A), wherein the content of the lithium nickel composite oxide represented by formula (A) in the positive electrode active material is 100 mass %, and the positive electrode further comprises lithium hydroxide, lithium carbonate and/or lithium hydrogen carbonate, and
- a separator consisting of one or more layers selected from a polyimide layer, a polyamide layer, and a polyamide imide layer,
- wherein the battery comprises an electrolyte solution, wherein the electrolyte solution comprises and acid anhydride in an amount of 0.1 mol/l or more and 3 mol/l or less,
- LiyNi(i-x)MxO2 (A)
- wherein 0≤x<0.5, 0<y≤1.2, and M is Co and Al.
Dependencies are inferred from the claim text.