Patent ID: 7736794

Claim:
A battery comprising: a cathode; an anode; and an electrolyte, wherein, the electrolyte contains a high molecular weight compound and an anion expressed by Chemical formula 1, wherein, Chemical formula 1 is B each of RF1, RF2, RF3, and RF4 in Chemical formula 1 is a perfluoro alkyl group represented by the formula C k F 2k+1 and where 1≦k≦12 and the high molecular weight compound includes at least the following three structures respectively represented by Chemical formula 5, Chemical formula 6 and Chemical formula 7, Chemical formula 5 is Chemical formula 6 is Chemical formula 7 is each of X11, X12, X2, and X3 in chemical formulae 5, 6 and 7 is a hydrogen atom or a methyl group, R1 is an alkylene group having 10 carbons or less, R2 is an alkyl group having 10 carbons or less with a branched or cyclic structure and R3 is an alkyl group having 10 carbons or less, a group expressed by Chemical formula 8, or a group expressed by Chemical formula 9, Chemical formula 8 is CH 2 a CF 2 b —C(F c R31) d R31 is a hydrogen atom, a fluorine atom, or a methyl fluoride group and 0≦a≦6, 0≦b≦16, c is 1 or 2, and d is 1 or 2, Chemical formula 9 is —R32-R33, and R32 in Chemical formula 9 is a bivalent linkage group and R33 is a cyclic carbonate group.