LMFP cathode materials with improved electrochemical performance
AssigneeDow Global Technologies LLC
InventorsShrikant N. Khot, Deidre A. Strand, Jamie L. Cohen, Thierry Drezen, Steven S. Kaye, Bin Li
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Abstract
Particulate LMFP cathode materials having high manganese contents and small amounts of dopant metals are disclosed. These cathode materials are made by milling a mixture of precursor materials in a wet or dry milling process. Preferably, off-stoichiometric amounts of starting materials are used to make the cathode materials. Unlike other high manganese LMFP materials, these cathode materials provide high specific capacities, very good cycle life and high energies even at high discharge rates.
Claims3
A particulate cathode material comprising an electroactive material having the empirical formula LiaMnbFecDdPO4, wherein
- a is a number from 1.025 to 1.10;
- b is from 0.70 to 0.85;
- c is from 0.1 to 0.3;
- d is from 0.01 to 0.075;
- (a+2b+2c+dV) is 2.85 to 2.99, wherein V is the valence of D, and D is a metal ion selected from one or more of magnesium, calcium, strontium, cobalt, titanium, zirconium, molybdenum, vanadium, niobium, nickel, scandium, chromium, copper, zinc, beryllium, lanthanum and aluminum, and further wherein at least a portion of the electroactive material has an olivine structure.
Dependencies are inferred from the claim text.