| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing positive electrode active material particles, in which a cell can be composed by using an easy to handle material in a negative electrode side, to provide such positive electrode active material particles, and to provide a lithium ion secondary battery comprising such positive electrode active material particles in a positive electrode active material layer.SOLUTION: The method for producing positive electrode active material particles 1 constituted of amorphous LiFePO(0<x≤2.5, 0<y≤2) comprises a synthesis step of synthesizing the positive electrode active material particles 1 by a sol-gel process. In the synthesis step, the positive electrode active material particles 1 are synthesized in an acid solution with a hydrogen ion exponent (pH) of 4.0 or less. |
