Preparation of lithium iron phosphate nano composite microsphere

A technology of lithium iron phosphate and nanocomposite, applied in phosphorus compounds, chemical instruments and methods, electrode manufacturing, etc., can solve the problems of unsatisfactory high-rate performance of battery materials, complex synthesis process, and instability, etc., and is suitable for large-scale industrialization Excellent production and rate performance, high tap density effect
CN101475157AActive Publication Date: 2009-07-08湖北金泉新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
湖北金泉新材料有限公司
Publication Date
2009-07-08

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Abstract

The invention discloses a method for preparing a lithium iron phosphate nano composite microsphere for a lithium-ion secondary battery anode material by a hydrothermal method, which comprises the following steps: evenly mixing a lithium source, an iron source and a phosphoric acid source according to the stoichiometric ratio of 1-1.05:1:1 to prepare an aqueous solution with certain concentration, adding proper amount of reducing agent, carbonizing agent, ion dopant and the like into the aqueous solution, growing and curing crystals under high-temperature hydrothermal condition, removing a solvent from a hydrothermal product, and burning the hydrothermal product in inert or reducing atmosphere to obtain a final product. The lithium iron phosphate anode material prepared by the method has a regular nano composite microsphere structure, has a particle diameter of between 2 and 4 mu m, even distribution, tap density up to 1.3 to 1.6 g / cm, and has excellent cycle performance and multiplying power performance. The method has simple and easily-controlled process, can use cheap trivalent iron as the iron source, can obtain rich raw materials, and is a practical technique for preparing lithium iron phosphate.
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Description

technical field

[0001] The invention relates to a preparation method of a positive electrode material of a lithium ion secondary battery, in particular to the preparation of lithium iron phosphate nanocomposite microspheres by a hydrothermal method, and belongs to the field of energy materials and technologies. Background technique

[0002] In recent years, due to its excellent electrochemical performance and safety and pollution-free characteristics, lithium-ion batteries have developed rapidly and achieved great commercial success, and are widely used in cameras, mobile phones and notebook computers. At present, the positive electrode materials used and researched in lithium-ion batteries are all lithium-intercalable compounds, generally including layered LiCoO 2 , LiNiO 2 , LiMnO 2 , spinel LiMn 2 o 4 and LiFePO with olivine structure 4 Wait.

[0003] Olivine LiFePO 4 With its rich raw materials, low price, high specific capacity, good cycle performance, and low en...

Claims

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