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A carbon-coated core-shell structure nano-silicon/graphene composite negative electrode material and preparation method thereof

A technology of graphene composite and core-shell structure, which is applied in the direction of nanotechnology, nanotechnology, structural parts, etc. for materials and surface science, can solve the problems of low initial efficiency, poor cycle performance, and complicated preparation process, and achieve easy The effect of operation, high capacity and simple process

Active Publication Date: 2020-04-14
CHENGDU GUIBAO SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the obtained composite material solves the problem of uniform dispersion of nano-silicon particles to a certain extent, it still has the disadvantages of low first-time efficiency and poor cycle performance, and there is still about 40% capacity fading after 100 cycles, and its preparation process is relatively complicated. complex

Method used

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  • A carbon-coated core-shell structure nano-silicon/graphene composite negative electrode material and preparation method thereof
  • A carbon-coated core-shell structure nano-silicon/graphene composite negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] In this example, the surfactant polydimethyldiallylammonium chloride and nano-silica particles with a diameter of less than 10 nm were used. First weigh 0.16g of surfactant polydimethyldiallylammonium chloride and disperse it in distilled water. After stirring for a period of time, add 0.9g of nano silicon dioxide, ultrasonically disperse for 0.5h, centrifuge, wash and dry dry to obtain cation-modified nano-silica material.

[0029] A 2 mg / ml graphene oxide sol was prepared by the Hummers method. Add the cation-modified nano-silica material prepared above into 100ml graphene oxide sol, stir and mix evenly, and freeze-dry to prepare nano-silica / graphene oxide powder.

[0030]Mix the above-prepared nano-silica / graphene oxide powder with 7.2g of aluminum chloride and 0.72g of aluminum powder, keep the temperature at 200°C for 5 hours under an argon atmosphere, and then cool it down to room temperature naturally. The obtained material is washed with a dilute hydrochloric ...

Embodiment 2

[0036] This example employs the surfactant dodecyldimethylbenzyl ammonium chloride and nano-silica particles with a diameter of less than 10 nm. First weigh 0.16g of surfactant dodecyldimethylbenzyl ammonium chloride and disperse it in distilled water. After stirring for a period of time, add 0.8g of nano silicon dioxide, ultrasonically disperse for 0.5h, centrifuge and wash and drying to obtain a cation-modified nano silicon dioxide material.

[0037] A 2 mg / ml graphene oxide sol was prepared by the Hummers method. Add the cation-modified nano-silica material prepared above into 100ml graphene oxide sol, stir and mix evenly, and freeze-dry to prepare nano-silica / graphene oxide powder.

[0038] Mix the above-prepared nano-silica / graphene oxide powder with 6.4g of aluminum chloride and 0.64g of aluminum powder, keep the temperature at 250° C. for 5 hours under an argon atmosphere, and then naturally cool to room temperature. The obtained material is washed with a dilute hydro...

Embodiment 3

[0042] This example uses the surfactant 3-aminopropyltriethylsilane and nano silica particles with a diameter of less than 10 nm. First weigh 0.16g of surfactant 3-aminopropyltriethylsilane and disperse it in distilled water. After stirring for a period of time, add 0.8g of nano silicon dioxide, ultrasonically disperse for 1h, centrifuge, wash and dry to obtain Cationic modified nano silica material.

[0043] A 5 mg / ml graphene oxide sol was prepared by the Hummers method. Add the cation-modified nano-silica material prepared above into 20 ml of graphene oxide solution, stir and mix evenly, and freeze-dry to prepare nano-silica / graphene oxide powder.

[0044] Mix the above-prepared nano-silica / graphene oxide powder with 6.4g of aluminum chloride and 0.64g of aluminum powder, keep the temperature at 200°C for 5 hours under an argon atmosphere, and then cool it down to room temperature naturally. The obtained material is washed with a dilute hydrochloric acid solution to prepa...

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Abstract

The invention discloses a carbon coated core shell structure nano-silicon / graphene composite anode material and a preparation method thereof. According to the composite anode material, nano-silicon dioxide or silicate is taken as a silicon source; through combination of graphene oxide sol, the nano-silicon dioxide or silicate is uniformly absorbed on a graphene oxide slice layer through electrostatic self-assembly, so a silicon dioxide / graphene oxide composite material or silicate / graphene oxide composite material is obtained; the material is restored at low temperature in situ, thereby obtaining the nano-silicon / graphene composite material; and the carbon composite coating is carried out on the nano-silicon / graphene composite material, thereby obtaining the target object. According to thepreparation method, the composite anode material is prepared through adoption of a simple technology. The composite anode material has the advantages of high coulombic efficiency and excellent cycleperformance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a carbon-coated core-shell structure nano-silicon / graphene composite negative electrode material and a preparation method thereof. Background technique [0002] At present, the specific capacity of commercial lithium-ion battery cathode materials has basically reached its limit value, and it is difficult to make a leap forward. Therefore, the development of anode materials will play a vital role in the safety, energy density and service life of batteries. . [0003] The theoretical gram capacity of silicon-based materials in existing negative electrode materials can reach 4200mAh / g (Li 22 Si 5 ), and good safety (the potential of lithium intercalation into silicon is lower than 0.5V, and there is no co-intercalation problem of solvent molecules), abundant raw material reserves, and low cost, it is one of the most promising anode materials for lithium-i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 刘方明彭工厂刘圣洁刘文静黄强万琦王有治瞿美臻
Owner CHENGDU GUIBAO SCI & TECH
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