Type of lithium iron phosphate cathode active material and its method of synthesis
AssigneeBYD Company Limited
InventorsYe Tian, Tangli Cheng, Zhengang Gong
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Abstract
This invention provides a type of lithium iron phosphate cathode active material and its method of synthesis. Said cathode active material contains the sintering product of lithium iron phosphate and a mixture. Said mixture comprises of two or more metal oxides where the metal elements are selected from groups II A, III A, IV A, V A, III B, IV B, or V B, and where the weight of one metal oxide is 0.5-20% of the weight of the other metal oxide. Greatly increased capacity can be achieved in rechargeable lithium-ion batteries using the lithium iron phosphate cathode active material provided by this invention.
Claims5
A method for producing a cathode active material, comprising the steps of:
- evenly mixing a lithium source, an iron source, a phosphorous source, and a mixture of metal oxides;
- heating the lithium source, the iron source, the phosphorous source, and the mixture to 600-900° C. in an environment of non-reacting gas;
- and
- sintering the lithium source, the iron source, the phosphorous source, and the mixture for at least two hours;
- wherein the mixture is a mixed crystal and is prepared by sintering at least two metal oxides for two hours or more at 600-1200° C.
Dependencies are inferred from the claim text.