Patent ID: 7608364
Filing Date: 2009-10-27
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
1. A lithium ion secondary battery comprising a cathode, an anode, a nonaqueous electrolytic solution, and a laminate film casing, wherein the anode comprises a non-graphitizable carbon which is amorphous as an anode activator; and the nonaqueous electrolytic solution consists of a nonaqueous solvent, an electrolyte, and an anode protecting component consisting of at least one sultone having a 5- to 7-membered cyclic sulfonate structure represented by general formula (1): wherein R and at least one vinylene carbonate represented by general formula (2): wherein R wherein the non-aqueous solvent is selected from the group consisting of propylene carbonate, ethylene carbonate, butyrene carbonate, vinylene carbonate, linear carbonates, aliphatic carboxylates, γ-lactones, linear ethers, cyclic ethers, dimethyl sulfoxide, 1,3-dioxolane, formamide, acetamide, dimethylformamide, acetonitrile, propionitrile, nitromethane, ethyl monoglyme, phosphoric acid triesters, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, 3-methyl-2-oxazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ethyl ether, anisole, N-methylpyrrolidone and fluorocarboxylates.