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Preparation method of nano-network conductive polymer coated lithium iron phosphate anode material

A conductive polymer, lithium iron phosphate technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effect of improving conductivity, improving rate performance, and restricting generation

Active Publication Date: 2014-02-26
ZHONGKE LITHIUM BATTERY NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no technical disclosure or use of coating lithium iron phosphate cathode materials with nano-network conductive polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Add 3.64g of cetyltrimethylammonium bromide into 100ml of 0.1mol / L sulfuric acid solution and stir until completely dissolved. Then 7.29g of lithium iron phosphate powder was dispersed in the solution, and ultrasonically stirred for 30 minutes to fully mix the lithium iron phosphate and cetyltrimethylammonium bromide. Add 1.8ml of aniline monomer under the condition of ultrasonic stirring, and continue ultrasonic stirring for 60min to obtain the mixed solution A;

[0019] 2. Cool the mixed solution A to -5°C, dissolve 6.49g of ferric chloride in 100ml of 0.1mol / L sulfuric acid to form a solution B, add B dropwise to the mixed solution A under the condition of nitrogen protection, at -5 The reaction was stirred at ℃ for 5 hours, the product was alternately washed with deionized water and ethanol until the filtrate was colorless, and dried in vacuum at 40℃ for 20 hours to obtain the nano-network polyaniline-coated lithium iron phosphate cathode material.

Embodiment 2

[0021] 1. Add 7.29g of cetyltrimethylammonium bromide to 100ml of 0.2mol / L hydrochloric acid solution and stir until completely dissolved. Then 7.29g of lithium iron phosphate powder was dispersed in the solution, and ultrasonically stirred for 60 minutes to fully mix the lithium iron phosphate and cetyltrimethylammonium bromide. Add 0.69ml of pyrrole monomer under the condition of ultrasonic stirring, and continue ultrasonic stirring for 30min to obtain the mixed solution A;

[0022] 2. Cool the mixed solution A to -2°C, dissolve 4.74g of potassium permanganate in 100ml of 0.2mol / L hydrochloric acid to form a solution B, add B dropwise to the mixed solution A under the protection of argon, and The reaction was stirred at -2°C for 15 hours, the product was alternately washed with deionized water and ethanol until the filtrate was colorless, and dried in vacuum at 60°C for 24 hours to obtain the nano-network polypyrrole-coated lithium iron phosphate cathode material.

Embodiment 3

[0024] 1. Add 6.4g of cetyltrimethylammonium chloride into 100ml of 0.2mol / L hydrochloric acid solution and stir until completely dissolved. Then 3.2 g of lithium iron phosphate powder was dispersed in the solution, and ultrasonically stirred for 60 minutes to fully mix the lithium iron phosphate and cetyltrimethylammonium chloride. Add 1.38ml of pyrrole monomer under the condition of ultrasonic stirring, and continue ultrasonic stirring for 60min to obtain the mixed solution A;

[0025] 2. Cool the mixed solution A to 0°C, dissolve 4.56g of ammonium persulfate in 100ml of 0.2mol / L hydrochloric acid to form a solution B, add B dropwise to the mixed solution A under nitrogen protection, and stir at 0°C After reacting for 24 hours, the product was alternately washed with deionized water and ethanol until the filtrate was colorless, and dried in vacuum at 60°C for 48 hours to obtain the nano-network polypyrrole-coated lithium iron phosphate cathode material.

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PUM

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Abstract

The invention discloses a preparation method of a nano-network conductive polymer coated lithium iron phosphate anode material. The preparation method is characterized in that: a surfactant is used as a template; and a conductive polymer monomer is subjected to in-situ polymerization on a lithium iron phosphate surface in a low-temperature acid solution medium and a nano-network structure is grown; and thus, the nano-network conductive polymer coated lithium iron phosphate anode material is formed. The special shape of the nano-network conductive polymer is favorable for a current carrier to be conducted among polymer aggregate particles; and the nano-network conductive polymer has high current carrier mobility ratio, and can effectively connect surfaces among lithium iron phosphate particles when coated on the lithium iron phosphate surface to form an effective conductive network, so the lithium iron phosphate conductivity is significantly improved, and the contact resistance and electrode polarization among the particles are reduced to ensure that the electrochemical performance of an electrode material is greatly improved. The preparation method has a simple process and readily-available raw materials, and is suitable for carrying out industrial large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a nano-network conductive polymer-coated lithium iron phosphate cathode material, and belongs to the technical field of lithium-ion battery materials and preparation thereof. Background technique [0002] With the gradual depletion of petrochemical resources and the deterioration of the ecological environment, more and more attention has been paid to energy conservation and efficient and clean use of energy, and lithium-ion secondary batteries have therefore become the focus of attention. In lithium-ion batteries, the cathode material is an important factor that determines its electrochemical performance, safety performance and future development direction. Lithium iron phosphate (LiFePO 4 ), as a new generation of lithium-ion battery cathode material with the most development and application potential, has attracted more attention from all walks of life due to its advantages such as abundant raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 谭强强邱琳琳
Owner ZHONGKE LITHIUM BATTERY NEW ENERGY CO LTD
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