Metal halide coatings on lithium ion battery positive electrode materials and corresponding batteries
AssigneeEnvia Systems, Inc.
InventorsSubramanian Venkatachalam, Deepak Kumaar Kandasamy Karthikeyan, Herman A. Lopez
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Abstract
Lithium ion battery positive electrode material are described that comprise an active composition comprising lithium metal oxide coated with an inorganic coating composition wherein the coating composition comprises a metal chloride, metal bromide, metal iodide, or combinations thereof. Desirable performance is observed for these coated materials. In particular, the non-fluoride metal halide coatings are useful for stabilizing lithium rich metal oxides.
Claims27
A lithium ion battery positive electrode material comprising an active composition comprising lithium metal oxide coated with an inorganic coating composition wherein the coating composition comprises a metal chloride, metal bromide, metal iodide, or combinations thereof.
A method for making a positive electrode material coated with a metal/metalloid non fluoride halide, wherein the non-fluoride halide comprises chloride, bromide, iodide or a combination thereof, the method comprising:
- combining in solution an appropriate amount of a soluble metal salt, a soluble non-fluoride halide compound and lithium metal oxide particles to precipitate metal halide as a coating on the metal oxide particles;
- and
- calcining the coated metal oxide particles in a substantially oxygen free atmosphere at a temperature from about 200° C. to about 800° C. for a time from about 1 h to about 25 h to form the metal/metalloid non-fluoride halide coated lithium metal oxide positive electrode material.
A method for making a positive electrode material coated with a metal/metalloid halide, the method comprising:
- milling a powder of the positive electrode material with a selected amount of a powder of the metal/metalloid halide to coat the positive electrode material with the metal/metalloid halide.
A lithium ion battery comprising
- a positive electrode,
- a negative electrode comprising a lithium incorporation composition,
- a separator between the positive electrode and the negative electrode, and
- an electrolyte comprising lithium ions,
- wherein the positive electrode comprises an active material, distinct electrically conductive powders, and a polymer binder,
- wherein the positive electrode active material comprises an active composition comprising lithium metal oxide coated with a metal halide coating composition, and the positive electrode active material having an average voltage of at least about 3.65 volts over a discharge from 4.5 to 2 volts at a rate of C/10 and a specific discharge specific capacity of at least about 160 mAh/g at cycle 500 at a discharge rate of C/3 from 4.5 volts to 2 volts.
Dependencies are inferred from the claim text.