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Improved production method of nanometer lithium iron phosphate cathode material

A lithium iron phosphate, cathode material technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as inability to guarantee product quality, poor product quality, etc., to avoid clogging and ensure consistency sex, ensure the effect of normal progress

Active Publication Date: 2018-03-23
湖南鹏博新材料有限公司
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Problems solved by technology

[0004] Although the manufacturing method disclosed in this patent can produce lithium iron phosphate, the steps of the manufacturing method are too simple to guarantee the quality of the product, and the product quality is poor. Therefore, an improved nano-lithium iron phosphate cathode material is designed. production process is necessary

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  • Improved production method of nanometer lithium iron phosphate cathode material
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  • Improved production method of nanometer lithium iron phosphate cathode material

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Embodiment Construction

[0055] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0056] The production process of the improved nano-lithium iron phosphate cathode material comprises the following process steps:

[0057] a. Mix lithium source compound, trivalent iron source compound and phosphorus source compound with water according to the stoichiometric ratio, then add doped metal ion oxide and primary carbon source, and mix evenly; the formed slurry is subjected to a high-energy ultrafine grinding treatment 2-3h, the D50 of the obtained slurry is less than 0.2 μm, spray dry to obtain a dry powder, and sieve; in this embodiment, the formed slurry is subjected to a high-energy ultrafine grinding treatment for 2.5h; the lithium source compound is lithium carbonate; Ferric iron source compound is Fe 2 o...

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Abstract

The invention provides an improved production method of nanometer lithium iron phosphate cathode material. The improved production method is capable of solving technical problems in the prior art thatthe steps are too simple, product quality is impossible to be ensured, and product quality is poor. The improved production method comprises following steps: a, a lithium source compound, a ferric iron source compound, and a phosphor source compound are mixed with water at a certain stoichiometric ratio, a doped metal ion oxide and a primary carbon source are added, and an obtained mixture is mixed to be uniform, and is subjected to spray drying so as to obtain a dried powder; b, the dried powder is subjected to pretreatment for 3 to 8h at 350 to 550 DEG C, a secondary carbon source and waterare added after cooling, and spray drying is carried out so as to obtain a spherical powder; c, the spherical powder obtained in step b is delivered through a fluid energy milling system for crushing, is subjected to treatment for 8 to 24h at 600 to 650 DEG C in nitrogen, high temperature treatment for 8 to 16h at 700 to 960 DEG C, and cooling so as to obtain the nanometer lithium iron phosphatecathode material. The nanometer lithium iron phosphate cathode material is high in product quality.

Description

technical field [0001] The invention relates to a production process, in particular to an improved production process of nanometer lithium iron phosphate cathode material. Background technique [0002] Lithium iron phosphate electrode materials are mainly used in various lithium-ion batteries. Since Japan's NTT first revealed AyMPO in 1996 4 (A is an alkali metal, M is a combination of CoFe: LiFeCoPO 4 ) Lithium battery cathode material with olivine structure, in 1997, the research group of Texas State University and others also reported LiFePO 4 The characteristics of reversibly moving in and out of lithium, the United States and Japan have simultaneously published olivine structure (LiMPO 4 ), making the material has received great attention, and caused extensive research and rapid development. Compared with traditional lithium-ion secondary battery cathode materials, spinel-structured LiMn 2 o 4 and layered LiCoO 2 Compared to LiMPO 4 The source of raw materials i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525B82Y30/00C01B25/45
CPCB82Y30/00C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 林晓丽陈晔
Owner 湖南鹏博新材料有限公司
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