| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing active material particles having little impurity for a nonaqueous electrolyte secondary battery comprising a compound of alkali metal-iron-fluorophosphate by using a simple solid phase method with high reproducibility. <P>SOLUTION: A method of producing active material particles composed of a compound represented by a general formula: A<SB POS="POST">x</SB>M<SP POS="POST">1</SP><SB POS="POST">y</SB>M<SP POS="POST">2</SP><SB POS="POST">1-y</SB>PO<SB POS="POST">4</SB>F (In the formula, A is one or two or more of elements selected from Li, Na and K where Na is indispensable and 1≤x≤2, M<SP POS="POST">1</SP>is one or two or more of elements selected from Fe and Co where 0.9≤y≤1, and M<SP POS="POST">2</SP>is one or two or more of elements selected from Mn, Ni, Mg, Al, Ti, V and Zn) includes: a step for mixing raw material powders as a source of A, M<SP POS="POST">1</SP>, M<SP POS="POST">2</SP>, PO<SB POS="POST">4</SB>and F; a temporary calcination step for heat treating the mixed raw material powders in a non-oxidizing gas; and a proper calcination step for heat treating the obtained temporary calcined matter in the non-oxidizing gas while being surrounded by a metal material. <P>COPYRIGHT: (C)2013,JPO&INPIT |
