Cathode material for lithium-ion secondary battery, cathode for lithium-ion secondary battery, and lithium-ion secondary battery
AssigneeSumitomo Osaka Cement Co., Ltd.
InventorsRyuuta Yamaya, Masataka Oyama
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Abstract
A cathode material for a lithium-ion secondary battery of the present invention is active material particles including central particles represented by General Formula LixAyDzPO4 (0.9<x<1.1, 0<y≤1, 0≤z<1, and 0.9<y+z<1.1; here, A represents at least one element selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr, and D represents at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, and Y) and a carbonaceous film that coats surfaces of the central particles, in which a coarse particle ratio in a particle size distribution is 35% or more and 65% or less.
Claims14
A cathode material for a lithium-ion secondary battery which is cracked particles including agglomerates of primary particles, the primary particles including central particles represented by General Formula LixAyDzPO4(0.9<x<1.1, 0<y≤1, 0≤z<1, and 0.9<y+z<1.1;
- here, A represents at least one element selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr, and D represents at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, and Y) and a carbonaceous film that coats surfaces of the central particles,
- wherein an average primary particle diameter of the primary particles is 20 nm or more and 500 nm or less,
- a coarse particle ratio in a particle size distribution of the cracked particles is 35% to 65%, and
- a median diameter of the cracked particles is 0.55 μm to 0.80 μm.
Dependencies are inferred from the claim text.