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Carbosphere/graphene gel composite material and preparation method thereof

A graphene gel and composite material technology, applied in the field of carbon microsphere/graphene gel composite material and its preparation, can solve the problems of unspecified electrode specific capacity, cumbersome operation, complicated process, etc., and achieve excellent cycle stability stability and rate performance, avoid agglomeration accumulation, and improve the effect of Coulombic efficiency

Inactive Publication Date: 2019-06-04
唐山烯牛石墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN107017091A discloses a nitrogen-containing multi-level porous carbon / graphene composite material and its preparation method and application. The composite material prepared by it has a specific capacity of only 320 mAh / g when doped with nitrogen, and the process is complicated and the operation cumbersome
However, the m-phenylenediamine used in the product is a carcinogen, which is harmful to the environment and the body of production personnel, and the process is not suitable for large-scale production, and there is no explanation for the specific capacity of the electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of carbon microsphere / graphene gel composite material, comprising the steps of:

[0021] (1) Measure the graphene oxide suspension with a mass concentration of 2 mg / mL, put 30 mL into a beaker, add 5 mL of CMC aqueous solution with a concentration of 0.5 mg / mL and 120 mg of MCMB. Then the above mixture was ultrasonically treated for 30 min, mixed evenly and then transferred to a polytetrafluoroethylene-lined hydrothermal reactor. The temperature was set at 150 °C, and the reaction time was 8 h.

[0022] (2) The reaction product of step (1) was naturally cooled to room temperature and then taken out, soaked and washed repeatedly with deionized water and absolute ethanol respectively to obtain MCMB / GA composite hydrogel. Subsequently, the MCMB / GA gel composite material was obtained by freeze-drying and storing in a vacuum freezer.

Embodiment 2

[0024] A preparation method of carbon microsphere / graphene gel composite material, comprising the steps of:

[0025] (1) Measure the graphene oxide suspension with a mass concentration of 2.5 mg / mL, put 40 mL into a beaker, add 8 mL of a CMC aqueous solution with a concentration of 1 mg / mL and 150 mg of MCMB. Then the above mixture was ultrasonically treated for 40 min, mixed evenly and then transferred to a polytetrafluoroethylene-lined hydrothermal reactor. The temperature was set at 180°C, and the reaction time was 6h.

[0026] (2) The reaction product of step (1) was naturally cooled to room temperature and then taken out, soaked and washed repeatedly with deionized water and absolute ethanol respectively to obtain MCMB / GA composite hydrogel. Subsequently, the MCMB / GA gel composite material was obtained by freeze-drying and storing in a vacuum freezer.

Embodiment 3

[0028] A preparation method of carbon microsphere / graphene gel composite material, comprising the steps of:

[0029] (1) Measure the graphene oxide suspension with a mass concentration of 3 mg / mL, put 30 mL into a beaker, add 10 mL of a CMC aqueous solution with a concentration of 0.5 mg / mL and 200 mg of MCMB. Then the above mixture was ultrasonically treated for 50 min, mixed evenly and then transferred to a polytetrafluoroethylene-lined hydrothermal reactor. The temperature was set at 190 °C, and the reaction time was 5 h.

[0030] (2) The reaction product of step (1) was naturally cooled to room temperature and then taken out, soaked and washed repeatedly with deionized water and absolute ethanol respectively to obtain MCMB / GA composite hydrogel. Subsequently, the MCMB / GA gel composite material was obtained by freeze-drying and storing in a vacuum freezer.

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Abstract

The invention relates to a carbosphere / graphene gel composite material and a preparation method thereof. The MCMB / GA gel composite material is prepared from raw materials of oxidized graphene and carbosphere (MCMB) in a hydro-thermal synthesis method. In the MCMB / GA composite material, MCMB is embedded into a three-dimensional porous structure GA skeleton to form a cladding structure. A binder carboxymethyl cellulose (CMC) is added in the preparation process to improve a binding force between carbospheres and graphene. The prepared composite material has high circulation stability and multiplying performance, the specific capacity of the composite electrode material is greater than 360 mAh / g, the first frequency is over 90%, the 500 cycles per circulation 1C is maintained for 90% and over,and the circulation life of the battery is greater than 500 times.

Description

technical field [0001] The invention relates to functional materials, in particular to a carbon microsphere / graphene gel composite material and a preparation method thereof. Background technique [0002] At present, the theoretical capacity of graphite, a commonly used anode material for lithium-ion batteries, is only 372 mAh / g, which largely limits the improvement of its energy density and power density. In order to improve the energy density and power density of lithium-ion batteries, various high-capacity anode materials have been developed, such as transition metal oxides, silicon-based materials, and tin-based materials, but these materials have large volume changes during charge / discharge. , leading to a sharp decline in the cycle performance of the battery. Compared with the above-mentioned negative electrode materials, the new carbon material graphene is considered as an ideal lithium-ion battery negative electrode material due to its excellent electrical conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 高晓晔侯林艳耿晓欣宋晋李金岩
Owner 唐山烯牛石墨烯科技有限公司
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