| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a positive electrode active material superior in safety and cost, and for providing a battery with a long lifetime. <P>SOLUTION: This positive electrode active material is expressed in a general formula (1) Li<SB>y</SB>K<SB>a</SB>Fe<SB>1-x</SB>X<SB>x</SB>PO<SB>4</SB>...(1) (provided that, in the formula, X is at least one or more of Group 2-13, 0<a≤0.25, 0≤x≤0.25, y is (1-a)), and the volume change ratio of the volume of a unit lattice in the case y is (x-a) in the general formula (1) (provided that, when x-a<0, y is 0) against the volume of the unit lattice in the case y is (1-a) in the general formula (1) is 4% or less. <P>COPYRIGHT: (C)2009,JPO&INPIT |
