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Method for preparing equal dispersion ferric phosphate lithium nano crystal by hydrothermal synthetis method

A lithium iron phosphate, hydrothermal synthesis technology, applied in the direction of electrode manufacturing, electrical components, battery electrodes, etc., can solve the problems of difficult lithium ion diffusion, difficulty, and poor high-rate discharge performance

Inactive Publication Date: 2007-10-03
胜利油田华鑫石油材料有限公司
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Problems solved by technology

However, the deficiencies in the following aspects hinder LiFePO 4 The industrial application of: (1) Fe in the synthesis 2+ easily oxidized to Fe 3+ , it is not easy to obtain single-phase LiFePO 4 ; (2) lithium ions in LiFePO 4 Diffusion is difficult in medium, resulting in low utilization of active materials; (3) LiFePO 4 Its own low conductivity leads to its poor high-rate discharge performance

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  • Method for preparing equal dispersion ferric phosphate lithium nano crystal by hydrothermal synthetis method
  • Method for preparing equal dispersion ferric phosphate lithium nano crystal by hydrothermal synthetis method

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Embodiment Construction

[0007] A method for preparing homogeneously dispersed lithium iron phosphate nanocrystals by hydrothermal synthesis. In the presence of surfactants, soluble ferrous salts, lithium salts and phosphoric acid are used as raw materials to directly synthesize nanocrystalline lithium iron phosphate / carbon composites under hydrothermal conditions. Material (LiFePO 4 / C).

[0008] The above-mentioned surfactant is selected from cetyltrimethylammonium bromide or polyethylene glycol. The addition amount of surfactant is 0.01-0.3mol / L.

[0009] The above-mentioned soluble ferrous salt, lithium salt and phosphoric acid are dosed according to stoichiometric ratio, and the total concentration thereof is 0.1-3.0 mol / L of the reaction system.

[0010] In the above-mentioned synthesis process, a precipitating agent can also be added, and the precipitating agent is selected from ammonia water, ammonium bicarbonate or urea. The amount of precipitant added is 0.1-1.0mol / L.

[0011] The above-...

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Abstract

A method for preparing uniformly scattered nanocrystal of iron-lithium phosphate by hydrothermal synthesis includes using ferrous salt and phosphoric acid as well as lithium hydroxide as raw materials to obtain reaction pioneer matter under temperature of 40-100deg.c first, then reacting on obtained pioneer matter in high pressure reactor with temperature of 150-200deg.c under hydrothermal condition and processing obtained product by high temperature under protection of inert gas to finally obtain said uniformly scattered nanocrystal with average particle diameter of 0.2-0.5micron.

Description

technical field [0001] The present invention relates to a kind of preparation method of lithium ion battery cathode material, especially relate to a kind of hydrothermal synthesis technology preparation homogeneously dispersed lithium ion battery cathode material nano-lithium iron phosphate / carbon composite material (LiFePO 4 / C) wet chemical method. Background technique [0002] With its excellent comprehensive performance, lithium-ion batteries have shown broad development space in the two major markets of portable storage batteries and environmentally friendly electric vehicle batteries. Lithium iron phosphate is cheap, environmentally friendly, high specific energy, and good thermal stability. It is an excellent cathode material for lithium-ion power batteries. It is mainly used in electric bicycles, hybrid electric vehicles and vehicle batteries, and has broad market prospects. The annual demand is expected to exceed 2 billion yuan. The industrialization of lithium ir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1397
CPCY02E60/10
Inventor 柳云骐刘春英安长华王强魏凯
Owner 胜利油田华鑫石油材料有限公司
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