NOVELTY - The lithium ion secondary cell consists of electrolyte solution, an anode, a cathode, and a separator. A polymerization inhibitor (100 ppm-5%) is added with respect to an additive mixed with the electrolyte solution.    USE - Lithium ion secondary cell is used for electronic devices such as mobile telephone.    ADVANTAGE - The lithium ion secondary cell has reduced swelling of electrode, and prevents generation of heat.    DETAILED DESCRIPTION - The lithium ion secondary cell consists of electrolyte solution, an anode, a cathode, and a separator. A polymerization inhibitor (100 ppm-5%) is added with respect to an additive mixed with the electrolyte solution. The additive is vinylene carbonate, para divinylbenzene, acrylic acid, vinyl compound, (alpha ),(beta )-unsaturated carboxylic acid, cyclotetrasiloxane and/or vinyl monomer. The polymerization inhibitor is 2,6-di-t-butyl-p-cresol, t-butylcatechol, phenol, hydroquinone, p-methoxy phenol, benzoquinone, 1,2-naphthoquinone, cresol, catechol, 2,5-di-t-butylhydroquinone, 6-t-butyl-m-cresol, 2,4-dimethyl-6-t-butylphenol, 2-t-butylhydroquinone, 4-methoxyphenol, 2,6-di-t-butyl-4-methyl phenol, 2,2,6,6-tetramethyl 1-piperidinyloxy, 2-t-butyl-4-hydroxyanisole, 3-t-butyl-4-hydroxyanisole, propyl ester 3,4,5-trihydroxy benzoic acid, 2-(1,1-dimethylethyl)-1,4-benzenediol, diphenyl picrylhydrazyl, 4-t-butylcatechol, N-methylaniline, p-methoxy diphenylamine, diphenylamine, N,N'-diphenyl-p-phenylene diamine, p-hydroxydiphenylamine, octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate, tetrakis(methylene(3,5-di-t-butyl)-4-hydroxy-hydro cinnamate) methane, phenothiazin, alkylamide isourea, thiodiethylenebis(3,5-di-t-butyl-4-hydroxy-hydro cinnamate), 1,2-bis(3,5-di-t-butyl-4-hydroxy hydro cinnamoyl)hydrazine, tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, cyclic neopentane tetrayl bis(octadecyl phosphite), 4,4'-thiobis(6-t-butyl-m-cresol), 2,2'-methylenebis(6-t-butyl-p-cresol), oxalyl bis(benzylienehydrazide), 4-methoxyphenol, 4-ethoxyphenol, 1,2-dihydroxybenzene, catechol monobutyl ether, pyrogallol, 4-aminophenol, 2-mercaptophenol, 4-mercaptophenol, 4-hydroxy-2,2,6,6-tetramethyl piperidinyloxy free radical, 4-oxo-2,2,6,6-tetramethyl piperidinyloxy free radical, and/or 4-amino-2,2,6,6-tetramethyl piperidinyl oxy free radical.