Positive electrode active material containing lithium composite oxide and lithium composite oxyfluoride, and battery including positive electrode containing positive electrode active material
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsRyuichi Natsui, Kensuke Nakura
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Abstract
A positive electrode active material contains a lithium composite oxide and a lithium composite oxyfluoride. The lithium composite oxyfluoride covers at least part of the surface of the lithium composite oxide. The lithium composite oxyfluoride is represented by a composition formula LiαMe2βOγFδ, where Me2 represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ru, and W; and 1.0≤α≤2.1; 0.8≤β≤1.3; 1.5≤γ≤2.9; and 0.1≤δ≤1.5. The crystal structure of the lithium composite oxyfluoride belongs to space group Fm-3m.
Claims12
A positive electrode active material comprising:
- a lithium composite oxide;
- and
- a lithium composite oxyfluoride covering at least part of the lithium composite oxide, wherein
- the lithium composite oxyfluoride is represented by a composition formula LiαMe2βOγFδ, where Me2 represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ru, and W;
- 1.0≤α≤2.1;
- 0.8≤β≤1.3;
- 1.5≤γ≤2.9;
- and 0.1≤δ≤1.5, and
- a crystal structure of the lithium composite oxyfluoride belongs to space group FM-3M,
- wherein a mass ratio of the lithium composite oxyfluoride to the lithium composite oxide is 0.001 or more and 0.1 or less.
Dependencies are inferred from the claim text.