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Lithium ion battery conductive modified lithium iron phosphate positive electrode material and preparation method thereof

A technology of lithium iron phosphate and cathode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor battery low temperature performance, low lithium ion conductivity, poor rate discharge performance, etc., and achieve large discharge capacity and safety performance. Good, improve the effect of electrical conductivity

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 conductive modified lithium iron phosphate positive electrode material for lithium batteries, which is made of the following raw materials in parts by weight (kg): 500 parts by weight of lithium iron phosphate, 10 parts of glucose, 2 parts of citric acid, 3 parts of magnesium nitrate, 3 parts of isopropanol, and 2 pentoxide Vanadium 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 1, antimony trioxide 3, chitosan 2, crosslinking agent TAC2, mica powder 4, niobium boride 1, Nb 2 o 5 1. Potassium carbonate 3: Mix all raw materials evenly, heat to 50-55°C, grind f...

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PUM

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Abstract

The invention discloses a lithium ion battery conductive modified lithium iron phosphate positive electrode material which is characterized in that the material is prepared from the raw materials of, by weight: 500 parts of lithium iron phosphate, 10-12 parts of glucose, 2-3 parts of citric acid, 3-4 parts of magnesium nitrate, 3-4 parts of isopropanol, 2-3 parts of vanadium pentoxide, 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 process conditions are easy to control, the price is low, and discharge capacity is high, such that power battery industrialization consistency and endurance can be ensured. The material has the advantages of no toxicity, no pollution, good safety performance, wide raw material source, long service life, and the like.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a conductive modified lithium iron phosphate cathode 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 ...

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