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Preparation method of self-supporting three-dimensional porous carbon negative electrode material

A carbon negative electrode material, three-dimensional porous technology, which is applied in the field of preparation of self-supporting three-dimensional porous carbon negative electrode materials for sodium ion batteries, can solve the problems of high technical difficulty and cost, reduced battery capacity, difficult industrialized production, etc., and achieves improved electron conduction. High efficiency, high safety and simple preparation method

Inactive Publication Date: 2019-07-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At this stage, most research institutes and factories prepare electrodes by coating method. It is necessary to comprehensively consider the number of coating layers, the thickness of wet coating, the rheological characteristics of coating liquid, the required coating precision, coating Cloth support materials and coating speed, etc., the process is complex, technically difficult and costly [Zhao Boyuan. Lithium-ion battery pole piece coating technology and equipment research [J]. Battery, 2000,30(2):56-58. ]
The addition of adhesives and conductive agents will directly reduce the battery capacity, and the coating quality depends on the operator's coating technology, which is difficult for industrial production

Method used

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  • Preparation method of self-supporting three-dimensional porous carbon negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Dissolve sucrose in a mixed solvent of acetone and deionized water with a volume ratio of 1:9, and stir thoroughly to obtain a 0.02mol / L precursor solution;

[0032] 2) Take a nickel foam self-support body with a length of 40mm, a width of 25mm, and a thickness of 1.0mm, and then ultrasonically clean it with deionized water, acetone, hydrochloric acid with a concentration of 2mol / L, and ethanol for 30min, 50min, 8min, and 40min, and then vacuum-dry it at 80°C 12h, then add the dried nickel foam self-supporting body and precursor solution into a polytetrafluoroethylene-lined reactor, and react hydrothermally at 180°C for 18h;

[0033] 3) After the reaction, cool down to room temperature naturally, wash the product 6 times with deionized water and absolute ethanol, and dry it in a vacuum oven at 80°C for 24 hours;

[0034] 4) The product of step 3) was placed in a ceramic crucible, heated from room temperature to 800° C. for 2 hours at a rate of 5° C. / min under the pro...

Embodiment 2

[0041] 1) Dissolve sucrose in a mixed solvent of acetone and deionized water with a volume ratio of 1:1, and stir thoroughly to obtain a 0.04mol / L precursor solution;

[0042] 2) Take a nickel foam self-support body with a length of 40mm, a width of 25mm, and a thickness of 1.0mm, and then ultrasonically clean it with deionized water, acetone, hydrochloric acid with a concentration of 1mol / L, and ethanol for 40min, 60min, 5min, and 50min, and then vacuum-dry it at 80°C 12h, then add the dried nickel foam self-supporting body and precursor solution into a polytetrafluoroethylene-lined reactor, and react hydrothermally at 160°C for 24h;

[0043] 3) After the reaction, cool down to room temperature naturally, wash the product 6 times with deionized water and absolute ethanol, and dry it in a vacuum oven at 120°C for 12 hours;

[0044] 4) Place the product of step 3) in a ceramic crucible, heat it from room temperature to 700° C. for 2 hours at a rate of 7° C. / min under the protec...

Embodiment 3

[0046] 1) Dissolve sucrose in a mixed solvent of acetone and deionized water with a volume ratio of 1:3, and stir thoroughly to obtain a 0.08mol / L precursor solution;

[0047] 2) Take a nickel foam self-support body with a length of 40 mm, a width of 25 mm, and a thickness of 1.0 mm, and then ultrasonically clean it with deionized water, acetone, hydrochloric acid with a concentration of 3 mol / L, and ethanol for 50 min, 30 min, 10 min, and 60 min, and then vacuum-dry it at 80°C 12h, and then add the dried nickel foam self-supporting body and precursor solution into a polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 190°C for 20h;

[0048] 3) After the reaction, cool down to room temperature naturally, wash the product 6 times with deionized water and acetone, and dry it in a vacuum oven at 100°C for 18 hours;

[0049] 4) Place the product of step 3) in a ceramic crucible, heat it from room temperature to 900°C at a rate of 10°C / min under the protec...

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Abstract

The invention discloses a preparation method of a self-supporting three-dimensional porous carbon negative electrode material. The preparation method comprises the following steps: dissolving saccharose into an acetone and deionized water mixed solvent to obtain a precursor solution; after mixing a foamed nickel self-supporting body and a precursor, carrying out a hydrothermal reaction, naturallycooling to room temperature, and washing and drying the product; and carrying out heat treatment on the product in an inert atmosphere so as to obtain a final product. A three-dimensional porous carbon material is grown on the surface in an in-situ mode by taking metal foamed nickel as the self-supporting body. In the subsequent heat treatment process, the part connected with metal nickel can be partially graphitized through the catalytic graphitization of metal nickel, so that the electron conductivity is improved. Moreover, the material is of relatively large specific surface area through the three-dimensional porous structure, the material can be in sufficient contact with an electrode material, more attachment sites are provided for sodium ions, and the material is of relatively high capacity. According to the method, the used raw materials are stable in ingredients and wide in resources, the technological operation is simple, the prepared electrode does not need a subsequent coating technology, the capacity loss is reduced, and the method is beneficial for industrial production.

Description

technical field [0001] The invention belongs to the technical field of self-supporting electrode preparation, and in particular relates to a preparation method of a self-supporting three-dimensional porous carbon negative electrode material for a sodium ion battery. Background technique [0002] Lithium-ion batteries show excellent performance in terms of energy density, rate performance, and cycle stability, and are recognized as the most excellent energy storage battery system. Lithium-ion batteries are not only used in portable electronic devices, but also have applications in fields such as large-scale stationary electrical energy storage, and have rapidly penetrated into daily life. However, due to the limited reserves of lithium on the earth, it is not enough to meet the huge demand of the lithium-ion battery market in the future, so it is very critical to research and develop other cheap energy storage battery systems. Sodium is rich in resources, low in cost, has si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/05
CPCC01B32/05H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄剑锋何元元李嘉胤曹丽云李倩颖党欢刘倩倩贺菊菊
Owner SHAANXI UNIV OF SCI & TECH
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