| abstract |
An electrode material for a lithium ion secondary battery having a high mass energy density at low temperature and high speed charge / discharge is provided. An electrode material for a lithium ion secondary battery of the present invention, LiFe x Mn 1-w- x-y-z Mg y Ca z A w PO 4 ( where, A is Co, Ni, Zn, Al and At least one selected from Ga, 0 ≦ w ≦ 0.05, 0.05 ≦ x ≦ 0.35, 0.01 ≦ y ≦ 0.10, 0.0001 ≦ z ≦ 0.002), a crystal structure orthorhombic comprises particles space group is PMNA, and the LiFe x Mn 1-w-x -y-z Mg y Ca z a w lattice volume V1 of PO 4, the LiFe x Mn 1-w-x-y- z Mg y Ca z a lattice volume of w Fe from PO 4 was chemically desorbing Li x Mn 1-w-x -y-z Mg y Ca z a w PO 4 V2 change rate (V1-V2) / V1 is 0.06 or more and 0.09 or less . [Selection figure] None |