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Method for preparing carbon-coated lithium iron phosphate from basic lithium iron phosphate

A technology for carbon-coated lithium iron phosphate and lithium iron phosphate is applied in the field of preparation of lithium iron phosphate and basic lithium iron phosphate to prepare carbon-coated lithium iron phosphate, which can solve problems such as undisclosed specific methods and achieve stable product performance. , The process is simple and the controllability is good.

Inactive Publication Date: 2013-08-28
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent "A Preparation Method of Basic Lithium Iron Phosphate" (ZL200710156063.6), LiFePO is mentioned 4 (OH) can be used as the preparation of LiFePO 4 raw materials, but did not disclose its specific method

Method used

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  • Method for preparing carbon-coated lithium iron phosphate from basic lithium iron phosphate
  • Method for preparing carbon-coated lithium iron phosphate from basic lithium iron phosphate
  • Method for preparing carbon-coated lithium iron phosphate from basic lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1mol iron phosphate FePO 4 , 1mol lithium hydroxide LiOH and 4L deionized water were put into a ball mill and milled for 1 hour to obtain a mixture; then the mixture was added to the reaction kettle, reacted at 120°C for 32 hours, filtered, and dried to obtain the chemical formula LiFePO 4 (OH) basic lithium iron phosphate.

Embodiment 2

[0061] 1mol iron phosphate FePO 4 , 1.02mol lithium hydroxide LiOH and 4.5L deionized water were put into a ball mill and milled for 2 hours to obtain a mixture; then the mixture was added to the reactor, reacted at 200°C for 20 hours, filtered, and dried to obtain the chemical formula: LiFePO 4 (OH) basic lithium iron phosphate.

Embodiment 3

[0063] 1mol iron phosphate FePO 4 , 1.05mol lithium hydroxide LiOH and 5L deionized water were put into a ball mill and milled for 3 hours to obtain a mixture; then the mixture was added to the reactor, reacted at 250°C for 6 hours, filtered, and dried to obtain the chemical formula LiFePO 4 (OH) basic lithium iron phosphate.

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Abstract

The invention discloses a method for preparing carbon-coated lithium iron phosphate from basic lithium iron phosphate. In conventional preparation processes for lithium iron phosphate, P, Fe and Li are originated from different raw materials, and in the process of mixing, inadequate batch mixing easily happens, which results in incomplete generation of lithium iron phosphate. The method provided by the invention comprises the following steps: mixing basic lithium iron phosphate, a carbon source and a catalyst and then carrying out sintering so as to obtain the carbon-coated lithium iron phosphate, wherein a mass ratio of the carbon source to basic lithium iron phosphate is 4-8: 100, and a mol ratio of metal ions in the catalyst to iron ions in basic lithium iron phosphate LiFePO4(OH) is 1-3: 100. According to the invention, P, Fe and Li are originated from the same raw material basic lithium iron phosphate, so the problem in homogeneity of batch mixing is overcome; the carbon source is decomposed at a high temperature to produce a gaseous organic matter which can reduce positive trivalent Fe in basic lithium iron phosphate into positive bivalent Fe and enables carbon to be deposited on the surface of lithium iron phosphate to form coating carbon. The method provided by the invention has the advantages of simple process, good controllability and stable product performance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a preparation method of lithium iron phosphate, in particular to a method for preparing carbon-coated lithium iron phosphate from basic lithium iron phosphate. Background technique [0002] Lithium-ion battery is a battery system widely used in contemporary times, which has the advantages of light weight, long life and no pollution. Lithium iron phosphate can be used as a cathode material for lithium-ion batteries. Batteries using lithium iron phosphate as the positive material are generally called lithium iron phosphate batteries. Compared with other types of lithium-ion batteries, lithium iron phosphate batteries have the characteristics of high safety, long life, and rich sources of raw materials, and are suitable for power batteries. Lithium iron phosphate batteries are widely used in electric vehicles in my country. [0003] In the existing technical solutions, the...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B31/02H01M4/58C01B32/05
CPCY02E60/10
Inventor 倪华良赵淑敏席俊华季振国
Owner HANGZHOU DIANZI UNIV
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