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Preparation method of LiFeXCo1-XPO4/N-C/CC composite material

A technology of composite materials and mixed solutions, which is applied in the preparation/purification of carbon, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of low electronic conductivity hindering development, low energy density, and affecting performance, so as to improve electrocatalysis Performance, simple processing method, performance-enhancing effect

Pending Publication Date: 2021-06-15
胡国强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiFePO 4 It is the most commonly used positive electrode material at present. It has the advantages of high cycle stability, high specific capacity, long cycle life, stable charge and discharge voltage, and green and pollution-free. It is currently the mainstream positive electrode material for power lithium-ion batteries in the domestic market, but LiFePO 4 The low energy density and low electronic conductivity hinder its further development
Studies have shown that LiFePO 4 Combining with carbon-based materials can effectively improve its performance, but powdered LiFePO 4 / C needs to be mixed with a binder to prepare an electrode material, which will bring additional internal resistance and affect its performance

Method used

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  • Preparation method of LiFeXCo1-XPO4/N-C/CC composite material
  • Preparation method of LiFeXCo1-XPO4/N-C/CC composite material

Examples

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Effect test

Embodiment 1

[0026] a LiFe X co 1-X PO 4 / N-C / CC composite material, specifically including the following preparation steps:

[0027] (1) Pretreatment of carbon cloth: put a carbon cloth with a side length of 2×3 into a mixed solution of 100ml of nitric acid and water with a volume ratio of 1:3, and conduct a hydrothermal reaction at 90°C for 2 hours;

[0028] (2) Add 0.03mol lithium acetate, 0.015mol ferric nitrate, 0.015mol cobalt nitrate and 0.03mol ammonium dihydrogen phosphate into 60ml deionized water, stir magnetically for 1 hour, transfer the above solution into a polytetrafluoroethylene reactor, put Carbon cloth, hydrothermally reacted at 190°C for 12h, then washed with deionized water;

[0029] (3) Put 5ml of ethylene glycol and 1ml of aniline into a beaker, add 55ml of deionized water, stir for 1 hour, add 1.5g of hexadecyltrimethylammonium bromide, continue to stir for 11 hours, and then age for 5 hours. After the reaction, Wash the product with deionized water and ethanol,...

Embodiment 2

[0040] a LiFe X co 1-X PO 4 / N-C / CC composite material, specifically including the following preparation steps:

[0041] (1) Pretreatment of carbon cloth: put a carbon cloth with a side length of 2×3 into a mixed solution of 100ml of nitric acid and water with a volume ratio of 1:3, and conduct a hydrothermal reaction at 80°C for 2 hours;

[0042] (2) Add 0.03mol lithium acetate, 0.01mol ferric nitrate, 0.02mol cobalt nitrate and 0.03mol ammonium dihydrogen phosphate into 60ml deionized water, stir magnetically for 1 hour, transfer the above solution into a polytetrafluoroethylene reactor, put Carbon cloth, hydrothermally reacted at 160°C for 10h, then washed with deionized water;

[0043] (3) Put 4ml of ethylene glycol and 1ml of aniline into a beaker, add 50ml of deionized water, stir for 1h, add 1g of cetyltrimethylammonium bromide, continue stirring for 10h, and then age for 4h. After the reaction, use Wash the product with deionized water and ethanol, and put it into ...

Embodiment 3

[0048] a LiFe X co 1-X PO 4 / N-C / CC composite material, specifically including the following preparation steps:

[0049] (1) Pretreatment of carbon cloth: put a carbon cloth with a side length of 2×3 into a mixed solution of 100ml of nitric acid and water with a volume ratio of 1:3, and conduct a hydrothermal reaction at 100°C for 2 hours;

[0050] (2) Add 0.03mol lithium acetate, 0.015mol ferric nitrate, 0.015mol cobalt nitrate and 0.03mol ammonium dihydrogen phosphate into 60ml deionized water, stir magnetically for 1 hour, transfer the above solution into a polytetrafluoroethylene reactor, put Carbon cloth, hydrothermally reacted at 190°C for 12h, then washed with deionized water;

[0051] (3) Put 5ml of ethylene glycol and 1ml of aniline into a beaker, add 60ml of deionized water, stir for 1 hour, add 2g of cetyltrimethylammonium bromide, continue to stir for 12 hours, and then age for 6 hours. After the reaction, use Wash the product with deionized water and ethanol, ...

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Abstract

The invention discloses a preparation method of a LiFeXCo1-XPO4 / N-C / CC composite material. The preparation method comprises the following steps: firstly dissolving lithium acetate, ferric nitrate, cobalt nitrate and ammonium dihydrogen phosphate in deionized water, carrying out hydrothermal reaction, then adding aniline, ethylene glycol and cetyltrimethylammonium bromide, stirring and aging, then putting in carbon cloth, and performing hydrothermal calcination to obtain the LiFeXCo1-XPO4 / N-C / CC composite material. The prepared LiFeXCo1-XPO4 / N-C / CC composite material is applied to a positive electrode material of a lithium ion battery and has good electrochemical performance and stability.

Description

technical field [0001] The present invention is applied to the cathode material of lithium ion battery, specifically relates to a kind of LiFe X co 1-X PO 4 / N-C / CC composite material preparation method. Background technique [0002] Since the second industrial revolution, the economy has developed by leaps and bounds, and the consumption of energy has gradually expanded. The predatory exploitation of natural resources by humans has led to the consumption of non-renewable resources, making oil, coal mines, natural gas and other non-renewable resources. Nearly exhausted in the middle of the 21st century. At the same time, the problem of environmental pollution has emerged rapidly along with the energy crisis, which has seriously affected the normal life of human beings. In order to alleviate various social problems caused by the energy crisis, the development and utilization of new green energy have attracted more and more attention. As a new type of energy storage device...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B25/45H01M4/58H01M4/62H01M10/0525
CPCC01B25/45C01B32/05H01M4/5825H01M4/625H01M10/0525C01P2004/03C01P2004/04C01P2006/40Y02E60/10
Inventor 胡国强李建洋
Owner 胡国强
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