Method for preparing anode material of lithium ion battery in series of phosphate of olivine type

A lithium-ion battery, olivine-type technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problem of difficulty in preparing mixed uniform metal ion-doped lithium iron phosphate cathode materials, affecting the energy density of cathode materials, and being unable to suppress Oxidation and other problems, to achieve uniform distribution of chemical components, good cycle performance, easy to control the effect of operation
CN101049922AInactive Publication Date: 2007-10-10CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2007-10-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to a method for preparing olivine-type phosphate-series lithium ion battery anode material. The method comprises: mixing one or more of ferrous salt solution, cobalt salt solution and manganese salt solution with oxalic acid or oxalate (precipitating agent) aqueous solution to obtain composite oxalate precursor, uniformly mixing with lithium source and phosphorus source by ball milling, and reacting in inert or weak-reductive atmosphere to obtain olivine-type phosphate-series lithium ion battery anode material. The method utilizes co-precipitation method for metal ion doping, and realizes molecular level uniform mixing among different ions. The obtained olivine-type phosphate-series lithium ion battery anode material has uniform chemical and physical compositions. The average particle size can be controlled within 0.3-10 mu.m. The first charge and discharge cycle specific capacity can reach 150 mAh / g at 0.1 C rate and room temperature. The livine-type phosphate-series lithium ion battery anode material has such advantages as high cycle performance and high charge / discharge performance.
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Description

technical field

[0001] The invention relates to a preparation method of an olivine-type phosphate series lithium-ion battery positive electrode material doped with metal ions by a co-precipitation method, and belongs to the technical field of material preparation. Background technique

[0002] In recent years, the research and development of lithium-ion batteries have made gratifying achievements, especially the improvement of the performance of the negative electrode and the development of the electrolyte system have achieved great results, but the research on the cathode materials of lithium-ion batteries appears to be relatively lagging behind, which has become a constraint for lithium-ion batteries. The bottleneck of battery market and application expansion. Lithium cobalt oxide, lithium nickel oxide, lithium nickel cobalt composite oxide, lithium manganese oxide, lithium vanadate and other positive electrode materials have always been a hot spot in the field of positive...

Claims

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