| abstract |
Provided is an active material for a non-aqueous electrolyte secondary battery in which heat generation due to an oxidation reaction of a negative electrode active material and a non-aqueous solvent is suppressed even when the battery temperature rises during overcharging. An active material for a non-aqueous electrolyte secondary battery includes a general formula (1): Li x Fe 1-y M y OF (wherein M is selected from the group consisting of Mn, Co, and Ni). At least one, x and y satisfy 0 ≦ x ≦ 1 and 0 ≦ y ≦ 0.5, respectively, and have a crystal structure belonging to the space group P42 / mnm. Is used. [Selection] Figure 1 |