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Lithium ion doped lithium iron phosphate composite material and preparation method thereof

A lithium iron phosphate and composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor rate discharge performance, poor battery low temperature performance, low lithium ion conductivity, etc. The effect of improving electrical conductivity and high cycle stability

Inactive Publication Date: 2014-01-22
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the defects of low electrical conductivity and low lithium ion conductivity of lithium iron phosphate, the battery has poor low temperature performance and poor rate discharge performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The present invention will be described in detail below through specific examples.

[0010] This example adopts the lithium iron phosphate material prepared by the patented technology of 201010226073.4, a preparation method of lithium iron phosphate nanomaterial.

[0011] A doped lithium iron phosphate composite material for lithium batteries, made of the following raw materials in parts by weight (kg): 500 lithium iron phosphate, 3 tin oxide, 4 vanadium pentoxide, 2 chromium trioxide, 3 lithium carbonate, Kaolin 2, modified silver powder 4, appropriate amount of water;

[0012] The modified silver powder is made of the following raw materials in parts by weight (kg): silver powder 100, nano-carbon 2, tapioca starch 2, bauxite 2, diatomite 3, methyltriethoxysilane 1, silicon carbide 2 , aluminum nitride 1, ZnO1, Nb 2 o 5 1-2: Mix all raw materials evenly, heat to 50-55°C, grind for 1-2 hours, disperse evenly into powder, put into calciner and sinter at 510-530°C for ...

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PUM

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Abstract

The invention discloses a lithium ion doped lithium iron phosphate composite material which is characterized in that the material is prepared from the raw materials of, by weight: 500 parts of lithium iron phosphate, 3-4 parts of tin oxide, 4-5 parts of vanadium pentoxide, 2-3 parts of chromium trioxide, 3-4 parts of lithium carbonate, 2-3 parts of kaolin, 4-5 parts of modification silver powder, and proper amount of water. According to the invention, modification silver powder is added, such that material conductivity is improved, and crystal growth is effectively inhibited, such that the uniformly dispersed lithium iron phosphate material is obtained. The material provided by the invention has stable structure, and high electrochemical activity. The material has high competitiveness in the respects of cost control, process simplification, discharge capacity, circulation performance, large-current discharge, and the like. The material has the characteristics of high performance and high circulation stability.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a lithium iron phosphate doped composite material for lithium batteries and a preparation method thereof. Background technique [0002] Lithium iron phosphate electrode materials are mainly used in various lithium-ion batteries. Compared with the traditional lithium-ion secondary battery cathode materials, LiMn2O4 with spinel structure and LiCoO2 with layered structure, LiMPO4 has wider source of raw materials, lower price and no environmental pollution. In the current existing technology, lithium iron phosphate has its unique advantages as a cathode material for lithium-ion batteries: (1) relatively high theoretical specific capacity of 170mAh / g; (2) good thermal and chemical stability; ( 3) Low cost, low toxicity and good safety performance; (4) Long cycle life. However, due to the defects of low electrical conductivity and low lithium ion conductivity of lithium iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/5825H01M4/626H01M4/628Y02E60/10
Inventor 林彭桃君蒋森陈夕顺
Owner HEFEI HENGNENG NEW ENERGY TECH