Lithium ion secondary battery
AssigneeNEC Corporation
InventorsShin Serizawa, Suguru Tamai, Kazuhiko Inoue
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Abstract
Deterioration in cycle characteristics and battery swelling are improved. The lithium ion secondary battery of the present invention is characterized in comprising an electrolyte solution comprising a multifunctional monomer comprising two or more epoxy groups and a negative electrode comprising a binder comprising a polymer comprising a monomer unit comprising a functional group selected from the group consisting of —OH, —OM, —COOH, —COOM and —COOCnH2n+1, wherein M is a metal element, and n is an integer of 1 to 5.
Claims7
A lithium ion secondary battery comprising
- an electrolyte solution comprising an additive comprising an epoxy compound comprising two or more epoxy groups, wherein the epoxy compound comprises an epoxycyclohexyl group represented by following structural formula (21):
- and
- a negative electrode comprising an active material and a binder comprising a polymer selected from the group consisting of polyvinyl alcohol, poly(meth)acrylic acid, poly(meth)acrylate, polyimide having a monomer unit which is not ring-closed, polyamide-imide having a monomer unit which is not ring-closed, and a copolymer of vinyl alcohol and sodium acrylate.
A method for manufacturing a lithium ion secondary battery, comprising the steps of:
- fabricating an electrode element by stacking a positive electrode and a negative electrode via a separator, and
- enclosing the electrode element and an electrolyte solution into an outer package,
- wherein the electrolyte solution comprises an additive comprising an epoxy compound comprising two or more epoxy groups, wherein the epoxy compound comprises an epoxycyclohexyl group represented by following structural formula (21):
- and
- the negative electrode comprises an active material and a binder comprising a polymer selected from the group consisting of polyvinyl alcohol, poly(meth)acrylic acid, poly(meth)acrylate, polyimide having a monomer unit which is not ring-closed, polyamide-imide having a monomer unit which is not ring-closed, and a copolymer of vinyl alcohol and sodium acrylate.
Dependencies are inferred from the claim text.