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Preparation method of lithium iron phosphate cathode material co-coated with conductive polymer/nano metal particles

A technology of nano metal particles and conductive polymers, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as loss of electrical conductivity, achieve good electronic conductivity, improve weak conductivity, and maintain the effect of cycle performance

Active Publication Date: 2015-10-07
嘉善县国创新能源研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, polyaniline will lose part of its conductive properties in the process of embedding and deintercalating lithium.

Method used

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  • Preparation method of lithium iron phosphate cathode material co-coated with conductive polymer/nano metal particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 0.11 g of aniline in 20.0 mL of 0.4 mol / L formic acid solution, stir and disperse for 30 min, then weigh 4.08 g of lithium iron phosphate powder, stir and disperse in the above solution and ultrasonically disperse for 2 h. After that, 0.1287 g of silver nitrate was weighed, poured into the mixed solution, and the reaction mixture was ultrasonically dispersed for 10 min to dissolve. Then weigh 0.27g of ammonium persulfate as the oxidant ammonium persulfate according to the 1:1 molar ratio of oxidant and polymer monomer, pour it into a flask, and keep the reaction mixture in an ultrasonic water bath at 0°C for 4h, cool to room temperature, and let it stand for 2h , and then filtered and washed three to five times with corresponding concentrations of acid solution and acetone, and vacuum dried at 80°C for 12 hours to obtain a high-rate lithium iron phosphate cathode material.

[0025] Take the active material polymer-coated lithium iron phosphate powder, acetylene...

Embodiment 2

[0028] Dissolve 0.11 g of aniline in 20.0 mL of 0.4 mol / L formic acid solution, stir and disperse for 30 min, then weigh 4.08 g of lithium iron phosphate powder, stir and disperse in the above solution and ultrasonically disperse for 2 h. Take by weighing 0.1287g nickel nitrate Ni (NO 3 ) 2 ·6H 2 O, poured into the mixed solution, and the reaction mixture was ultrasonically dispersed for 10 min to dissolve. Then weigh 0.27g of ammonium persulfate as the oxidant ammonium persulfate according to the 1:1 molar ratio of oxidant and polymer monomer, pour it into a flask, and keep the reaction mixture in an ultrasonic water bath at 0°C for 4h, cool to room temperature, and let it stand for 2h , and then filtered and washed three to five times with corresponding concentrations of acid solution and acetone, and vacuum dried at 80°C for 12 hours to obtain a high-rate lithium iron phosphate cathode material.

[0029] Take the active material polymer-coated lithium iron phosphate powd...

Embodiment 3

[0032] Dissolve 0.11 g of aniline in 20.0 mL of 0.4 mol / L formic acid solution, stir and disperse for 30 min, then weigh 4.08 g of lithium iron phosphate powder, stir and disperse in the above solution and ultrasonically disperse for 2 h. Take by weighing 0.1287g copper nitrate Cu (NO 3 ) 2 ·3H 2O, poured into the mixed solution, and the reaction mixture was ultrasonically dispersed for 10 min to dissolve. Then weigh 0.27g of ammonium persulfate as the oxidant ammonium persulfate according to the 1:1 molar ratio of oxidant and polymer monomer, pour it into a flask, and keep the reaction mixture in an ultrasonic water bath at 0°C for 4h, cool to room temperature, and let it stand for 2h , and then filtered and washed three to five times with corresponding concentrations of acid solution and acetone, and vacuum dried at 80°C for 12 hours to obtain a high-rate lithium iron phosphate cathode material.

[0033] Take the active material polymer-coated lithium iron phosphate powde...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate anode material co-coated by conducting polymer / nanometer metal particles. The preparation method comprises the following steps of: (1) sufficiently diffusing a polymer monomer and lithium iron phosphate powder in an acid solution, so as to obtain a mixed solution A, wherein the polymer monomer is one or a combination of more than one of aniline, pyrrole, thiophene and 3,4-ethylenedioxythiophene; (2) adding a metallic compound in the mixed solution, and sufficiently diffusing to obtain a mixed solution B, wherein the metallic compound is one of silver nitrate, nickel nitrate, nickel sulfate, copper nitrate, copper sulfate, chloroauric acid and chloroplatinic acid; and (3) adding an oxidant in the mixed solution B, carrying out ultrasonic water bath on the obtained reaction mixtures at a temperature of 0-30 DEG C for 1-4 hours; standing for 1-2 hours at the room temperature, filtering, washing and drying so as to obtain the lithium iron phosphate anode material co-coated by the conducting polymer / nanometer metal particles by. The material provided by the invention has the advantages of high material capacity and good rate capability.

Description

Technical field: [0001] The invention relates to a preparation method of a lithium iron phosphate cathode material, in particular to a method belonging to the fields of lithium ion battery materials and electric vehicles. Background technique: [0002] Automobiles have become an indispensable means of transportation for human life and social development today. It has played an irreplaceable and huge role in promoting the progress of human society, but at the same time it has brought negative impacts such as environmental damage and energy shortages to social development. CO from vehicles 2 , sulfide SO x , Nitrogen oxide NO x Harmful gases such as greenhouse effect intensify, ozone layer depletion, acid rain and other increasingly serious environmental problems. The second challenge facing the development of the automobile industry is the issue of energy supply. With the increase of the world's population and the improvement of living standards, the demand for automobile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 王连邦姚金翰王剑波
Owner 嘉善县国创新能源研究院
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