| abstract |
The present invention provides a lithium secondary battery comprising a positive electrode and a negative electrode having specific compositions and physical properties, and a non-aqueous electrolyte solution containing at least one compound selected from the following substances in an amount of 10ppm or more, the substances include: cyclic siloxane compounds represented by formula (1), fluorosilane compounds represented by formula (2), compounds represented by formula (3), compounds having S-F bonds in the molecule, nitric acid salts, nitrites, monofluorophosphates, difluorophosphates, acetates and propionates. The lithium secondary battery has high capacity, long life, and high output. In formula (1), R 1 and R 2 are organic groups having 1 to 12 carbon atoms, and n is an integer of 3 to 10; in formula (2), R 3 to R 5 are those having 1 to 12 carbon atoms. Organic group, x is an integer from 1 to 3, p, q and r are each an integer from 0 to 3, and 1≤p+q+r≤3; in formula (3), R 6 to R 8 are carbon atoms In the organic groups of numbers 1 to 12, A is a group consisting of H, C, N, O, F, S, Si and/or P. |