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Lithium iron phosphate cathode material for high-power lithium battery and preparation method of lithium iron phosphate cathode material

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor rate discharge performance, low lithium ion conductivity, and poor low-temperature performance of batteries, so as to achieve large discharge capacity and cause environmental pollution. Pollution, the effect of improving conductivity

Inactive Publication Date: 2014-01-29
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 lithium iron phosphate cathode material for a high-power lithium battery, made of the following raw materials in parts by weight (kg): 500 parts by weight of lithium iron phosphate, 4 aluminum nitride powder, 2 monoglyceride stearate, 3 soybean oil, and montmorillonite Stone powder 3, 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 int...

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PUM

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Abstract

The invention discloses a lithium iron phosphate cathode material for a high-power lithium battery. The lithium iron phosphate cathode material for the high-power lithium battery is characterized by being prepared from the following raw materials in parts by weight: 500 parts of lithium iron phosphate, 4 to 5 parts of aluminum nitride powder, 2 to 3 parts of stearic acid monoglyceride, 3 to 4 parts of soybean oil, 3 to 4 parts of montmorillonite powder, 4 to 5 parts of modified silver powder and a proper amount of water. The modified silver powder is added, so the conductivity of the material is improved, growth of a crystal is effectively inhibited and the uniformly dispersed lithium iron phosphate material is obtained. The lithium iron phosphate cathode material has large discharge capacity, guarantees the industrialization consistency and the cruising capability of power batteries, is low in price and non-toxic, avoids environmental pollution, and meets the high-power power requirement.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a lithium iron phosphate cathode material for a high-power lithium battery and a preparation method thereof. Background technique [0002] Lithium iron phosphate electrode materials are mainly used in various lithium-ion batteries. Compared with traditional lithium-ion secondary battery cathode materials, spinel-structured LiMn 2 O4 and layered LiCoO 2 Compared to LiMPO 4 The source of raw materials is wider, the price is lower and there is 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 conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/624H01M4/628Y02E60/10
Inventor 林彭桃君蒋森陈夕顺
Owner HEFEI HENGNENG NEW ENERGY TECH