Patent ID: 8039148

Claim:
A non-aqueous electrolyte secondary battery comprising: a positive electrode comprising a positive electrode mixture; a negative electrode comprising a negative electrode mixture; and a non-aqueous electrolyte, wherein said negative electrode mixture includes a material capable of absorbing and desorbing Li and a carbon material, said material capable of absorbing and desorbing Li includes at least one element selected from the group consisting of Si and Sn, the amount of said carbon material is 3 to 60% by weight of said negative electrode mixture, at least one of said positive electrode, said negative electrode, and said non-aqueous electrolyte contains a lithium perfluoroalkylsulfonyl imide represented by the following general formula (1): LiN(C m F 2m+1 SO 2 )(C n F 2n+1 SO 2 ) (1) where m and n each represent an integer of 1 to 5 and may be m=n, and the ratio of the total weight of said lithium perfluoroalkylsulfonyl imide contained in at least one of said positive electrode, said negative electrode, and said non-aqueous electrolyte to the weight of said carbon material is 10 −3 to 10.