| abstract |
Provided is a lithium secondary battery, including: a positive electrode containing a positive electrode active material that contains a lithium transition metal compound X, which is at least one selected from the group consisting of a lithium transition metal composite oxide and a lithium transition metal phosphate, a ratio of Mn in transition metal elements contained in the lithium transition metal compound X being from 0 mol% to less than 50 mol%; a negative electrode; and a nonaqueous electrolyte solution containing a boron compound represented by the following Formula (1): in Formula (1), n represents an integer from 1 to 5, M + represents an Li + ion or an H + ion, and when n is an integer from 2 to 5, more than one M + may be the same as or different from each other. |