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Preparation method of 3D porous graphite/carbon nanotube-nanometer silicon aerogel lithium ion battery cathode material

A nano-silicon aerogel and porous graphene technology, which can be used in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability

Active Publication Date: 2018-07-06
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of poor cycle stability of existing lithium-ion battery negative electrode materials, the present invention provides a method for preparing a 3D porous graphene / carbon nanotube-nano silicon airgel lithium-ion battery negative electrode material

Method used

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  • Preparation method of 3D porous graphite/carbon nanotube-nanometer silicon aerogel lithium ion battery cathode material
  • Preparation method of 3D porous graphite/carbon nanotube-nanometer silicon aerogel lithium ion battery cathode material
  • Preparation method of 3D porous graphite/carbon nanotube-nanometer silicon aerogel lithium ion battery cathode material

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Embodiment 1

[0049] In the first step, the surfactant polyvinylpyrrolidone is added to deionized water at 0.1%, and stirred for 2 hours to fully dissolve the surfactant in the water;

[0050] In the second step, carbon nanotubes and nano-silicon are added to the solution in the first step at a mass ratio of carbon nanotubes and nano-silicon of 1:1, and ultrasonicated until they are uniformly dispersed to obtain a certain concentration of carbon nanotubes and nano-silicon mixed Dispersion solution A;

[0051] The third step is to prepare a graphene oxide aqueous solution with a solution concentration of 2 mg / mL according to the mass ratio of graphene oxide and nano-silicon at a ratio of 1:0.1, and ultrasonically until it is uniformly dispersed to obtain solution B;

[0052] The 4th step, according to the mass ratio of graphene oxide and nickel nitrate is the ratio of 1:0.1, nickel nitrate is added in the solution B, stirs 1h, obtains mixed solution C;

[0053] In the fifth step, mix the mi...

Embodiment 2

[0058] In the first step, the surfactant polyvinylpyrrolidone is added to deionized water at 0.01%, and stirred for 1 hour to fully dissolve the surfactant in the water;

[0059] In the second step, carbon nanotubes and nano-silicon are added to the solution in the first step at a mass ratio of carbon nanotubes and nano-silicon of 1:5, and ultrasonicated until they are uniformly dispersed to obtain a certain concentration of carbon nanotubes and nano-silicon mixed Dispersion solution A;

[0060] The third step is to prepare a graphene oxide aqueous solution with a solution concentration of 0.5 mg / mL according to the mass ratio of graphene oxide and nano-silicon at a ratio of 1:10, and ultrasonically until it is uniformly dispersed to obtain solution B;

[0061] The 4th step, according to the mass ratio of graphene oxide and nickel nitrate is the ratio of 1:1, ferric chloride is added in the solution B, stirs 1h, obtains mixed solution C;

[0062] In the fifth step, mix the mi...

Embodiment 3

[0067] In the first step, the surfactant polyvinylpyrrolidone is added to deionized water at 1%, and stirred for 12 hours to fully dissolve the surfactant in the water;

[0068] In the second step, carbon nanotubes and nano-silicon are added to the solution in the first step at a mass ratio of carbon nanotubes and nano-silicon of 1:0.1, and ultrasonicated until they are uniformly dispersed to obtain a certain concentration of carbon nanotubes and nano-silicon mixed Dispersion solution A;

[0069] The third step is to prepare a graphene oxide aqueous solution with a solution concentration of 1 mg / mL according to the mass ratio of graphene oxide and nano-silicon at a ratio of 1:2, and ultrasonically until it is uniformly dispersed to obtain solution B;

[0070] The 4th step, according to the mass ratio of graphene oxide and nickel nitrate is the ratio of 1:1, cobalt oxalate is added in the solution B, stirs 1h, obtains mixed solution C;

[0071] In the fifth step, mix the mixed...

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Abstract

The invention relates to a preparation method of a 3D porous graphite / carbon nanotube-nanometer silicon aerogel lithium ion battery cathode material, and belongs to the technical field of lithium ionbattery cathode materials, and solves the problem of poor cycling stability of the existing lithium ion battery cathode material. A carbon nanotube is taken as an internal conductive network and a carrier framework of nanometer silicon, and further combines with porous graphite in a sheet to construct the 3D porous graphite / carbon nanotube-nanometer silicon aerogel lithium ion battery cathode material. The high specific capacity of the nanometer silicon is fully used, and meanwhile, the high rate performance and the high cycle performance are realized with the help of the graphite and the carbon nanotube.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of a 3D porous graphene / carbon nanotube-nano silicon airgel lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries dominate portable power supplies due to their advantages of high open circuit voltage, long cycle life, high energy density, low self-discharge, and no memory effect. In order to meet the requirements of miniaturization of electronic equipment and high power of large equipment, improving energy density and rate performance has become an important development direction of lithium-ion batteries. [0003] As a promising anode material for lithium-ion batteries, silicon has a capacity of up to 4200mAh•g -1 Excellent theoretical specific capacity, low lithium intercalation potential, abundant reserves, and low cost. However, silicon shows a volume chan...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 马灿良赵云周翔
Owner SHANXI UNIV
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