HIGH-CAPACITY LITHIUM METAL OXYFLUORIDES WITH COMBINED METAL AND OXYGEN REDOX FOR LI-ION BATTERY CATHODES

摘要

A lithium metal oxide suitable for use as a cathode material in a rechargeable battery having a general formula of: Li_xM_zM′_zO_uF_y, where x is 1.80x2.20, y=1, and more specifically 1.90x2.10, with 1.80u2.20. Preferably, 1.90u2.10, and 0.80y1.20, or more specifically, 0.90y1.10. The lithium metal oxide has a cation-disordered rocksalt structure, wherein M is a transition metal selected from a first group consisting of Ni, Mn, Co, Fe, and combinations thereof. M′ is a transition metal selected from a second group consisting of Ti, Zr, Nb, Mo, Sn, Hf, Te, Sb, and combinations thereof. M has a first oxidation state q and M′ has a second oxidation state q′, with (q/z)+(q′/z′)=+3, preferably +2.7≤q/z)+(q′/z′)≤+3.3.