Lithium Iron Phosphate Cathode Material
AssigneeBYD Company Limited
InventorsQuan Dai, Julin Shen, Feng Xiao
Life of this patent
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Abstract
Described are lithium iron phosphate cathode materials for lithium secondary batteries and methods of preparation thereof. Better cathode materials may be produced by two carbon processes. The first carbon process comprises mixing lithium compounds, iron compounds, phosphorous compounds and a first carbon additive, and heating the mixture to a first temperature. The second carbon process comprises adding a second carbon additive to the to the product of the first carbon process and heating the mixture to a second temperature. The cathode material so produced exhibits superior electrical properties.
Claims20
A method of preparing a cathode material for lithium secondary batteries comprising:
- providing a mixture with at least one lithium compound, at least one iron compound, at least one phosphorous compound and a first carbon additive;
- heating the mixture to a first temperature;
- providing a second carbon additive to the mixture, wherein the first and second carbon additives are selected from the group consisting of benzene naphthalene phenanthrene copolymer, benzene phenanthrene binary copolymer, benzene anthracene binary copolymer, poly benzene, soluble starch, polyvinyl alcohol, polypropylene, polypropylene amide, sucrose, glucose, urea, phenolic resin, furfural resin, ureaformaldehyde resin, epoxy resin, graphite and acetylene black;
- and
- heating the mixture to a second temperature.
A method of preparing a cathode material for lithium secondary batteries comprising:
- providing a mixture with at least one lithium compound, at least one iron compound, at least one phosphorous compound, at least one metal compound and a first carbon additive;
- heating the mixture to a first temperature;
- providing a second carbon additive to the mixture, wherein the first and second carbon additives are selected from the group consisting of benzene naphthalene phenanthrene copolymer, benzene phenanthrene binary copolymer, benzene anthracene binary copolymer, poly benzene, soluble starch, polyvinyl alcohol, polypropylene, polypropylene amide, sucrose, glucose, urea, phenolic resin, furfural resin, ureaformaldehyde resin, epoxy resin, graphite and acetylene black;
- and
- heating the mixture to a second temperature.
A method of preparing a cathode material for lithium secondary batteries comprising:
- providing a mixture with at least one lithium compound, at least one trivalent iron compound, at least one phosphorous compound and a first carbon additive;
- heating the mixture to a first temperature;
- providing a second carbon additive to the mixture, wherein the first and second carbon additives are selected from the group consisting of benzene naphthalene phenanthrene copolymer, benzene phenanthrene binary copolymer, benzene anthracene binary copolymer, poly benzene, soluble starch, polyvinyl alcohol, polypropylene, polypropylene amide, sucrose, glucose, urea, phenolic resin, furfural resin, ureaformaldehyde resin, epoxy resin, graphite and acetylene black;
- and
- heating the mixture to a second temperature.
Dependencies are inferred from the claim text.