Patent ID: 8795870

Claim:
A lithium ion secondary battery comprising: a cathode and an anode being opposed to each other with a separator in between; and an electrolytic solution, wherein one or more of the cathode, the anode, and the separator is coated with an organic silicon compound, the organic silicon compound including a compound having Formula 1 as a polysilsesquioxane skeleton or a compound having Formula 2 as a polysilsesquioxane skeleton or both described below, [Formula 1] [R1SiO 3/2 ] m (1) where R1 is an alkyl group with carbon number of 1 to 12, an alkenyl group with carbon number of 1 to 12, an alkynyl group with carbon number of 1 to 12, a cycloalkyl group, or an aryl group, and m is one of integer numbers 4 to 12, [Formula 2] [R2SiO 3/2 ] n [XSiO 3/2 ] n-1 (2) where R2 is an alkyl group with carbon number of 1 to 12, an alkenyl group with carbon number of 1 to 12, an alkynyl group with carbon number of 1 to 12, a cycloalkyl group, or an aryl group; X is a hydrogen group, a halogen group, an alkyl group containing an unsaturated bond, an ester group, an ester group containing an unsaturated bond, a halogenated silyl group, or an alkyl group containing a halogenated silyl group; and n is one of integer numbers 4 to 12.