| abstract |
(57) [Summary] [Structure] A negative electrode using a carbon material capable of inserting and extracting lithium ions as a negative electrode material, a positive electrode, and a non-aqueous electrolyte solution obtained by dissolving a fluorine-containing lithium salt in an organic solvent. In a non-aqueous electrolyte secondary battery provided, the carbon material includes lithium carbonate, lithium hydroxide, lithium chloride, lithium fluoride, lithium bromide, lithium iodide, lithium oxide, 1 to 100 parts by weight of at least one lithium compound selected from the group consisting of lithium sulfide, lithium nitride, lithium phosphide, lithium nitrate, lithium sulfate and lithium phosphate is added to 100 parts by weight of the fluorine-containing lithium salt. It is mixed. [Effect] The reaction between the added lithium compound and hydrofluoric acid Since it occurs preferentially over the reaction between C 6 Li generated during charging and hydrofluoric acid, it becomes difficult to release lithium ions from C 6 Li. Therefore, the battery of the present invention is excellent in charge / discharge cycle characteristics and storage characteristics in a charged state. |