Conductive polymer-coated silicon composite carbon nanotube anode material and preparation method and application thereof

A technology of conductive polymer and negative electrode material, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of poor electrode cycle performance, material structure damage, mechanical pulverization, etc., achieve good electrical conductivity, inhibit volume expansion, reduce The effect of loss

Active Publication Date: 2018-12-07
淄博巨浪新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the silicon anode exhibits poor cycle performance due to its severe volume expansion and contraction during the lithium intercalation and desorption cycle, resulting in the destruction of the material structure and mechanical pulverization.

Method used

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  • Conductive polymer-coated silicon composite carbon nanotube anode material and preparation method and application thereof
  • Conductive polymer-coated silicon composite carbon nanotube anode material and preparation method and application thereof
  • Conductive polymer-coated silicon composite carbon nanotube anode material and preparation method and application thereof

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Embodiment 1

[0030] This embodiment provides a method for preparing a conductive polymer-coated silicon composite carbon nanotube negative electrode material, which includes the following steps:

[0031] (1) Disperse elemental silicon (D50=7 micron, purity 99.95%, iron content<120ppm) in water, grind through sand mill 4h, obtain nano-silicon dispersion liquid, silicon particle diameter in the described nano-silicon dispersion liquid is D50= 300nm;

[0032] (2) get emulsifier dodecylbenzenesulfonic acid DBSA (also be the protonic acid dopant of polyaniline simultaneously) and emulsion dispersion agent dodecyl ammonium sulfate ALS respectively and dissolve in water, described emulsifier and described The molar ratio of the emulsion dispersant is 1:1, and then aniline monomer is added, the mass ratio of the aniline monomer to the emulsifier is 1:1.7, fully stirred and mixed uniformly, and the particle size of the emulsion droplet is 20-30nm aniline microemulsion;

[0033] (3) adding the nan...

Embodiment 2

[0038] This embodiment provides a method for preparing a conductive polymer-coated silicon composite carbon nanotube negative electrode material, which includes the following steps:

[0039] (1) Disperse elemental silicon (D50=7 micron, purity 99.95%, iron content<120ppm) in water, grind through sand mill 2h, obtain nano-silicon dispersion liquid, silicon particle diameter in the described nano-silicon dispersion liquid is D50= 1000nm;

[0040](2) get emulsifier dodecylbenzenesulfonic acid DBSA (also be the protonic acid dopant of polyaniline simultaneously) and emulsion dispersion agent dodecyl ammonium sulfate ALS respectively and dissolve in water, described emulsifier and described The molar ratio of the emulsion dispersant is 1:1, and then add aniline monomer, the mass ratio of the aniline monomer to the emulsifier is 1:1, fully stir and mix uniformly, and the particle size of the emulsion droplet is 110-120nm aniline microemulsion;

[0041] (3) adding the nano-silicon ...

Embodiment 3

[0046] This embodiment provides a method for preparing a conductive polymer-coated silicon composite carbon nanotube negative electrode material, which includes the following steps:

[0047] (1) Disperse elemental silicon (D50=7 micron, purity 99.95%, iron content<120ppm) in water, grind through sand mill 3h, obtain nano-silicon dispersion liquid, silicon particle diameter in the described nano-silicon dispersion liquid is D50= 500nm;

[0048] (2) get emulsifier dodecylbenzenesulfonic acid DBSA (also be the protonic acid dopant of polyaniline simultaneously) and emulsion dispersion agent dodecyl ammonium sulfate ALS respectively and dissolve in water, described emulsifier and described The molar ratio of the emulsion dispersant is 1:1, and then aniline monomer is added, the mass ratio of the aniline monomer to the emulsifier is 1:1.3, fully stirred and mixed uniformly, and the particle size of the emulsion droplet is 50-60nm aniline microemulsion;

[0049] (3) adding the nan...

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Abstract

The invention relates to a preparation method of conductive polymer-coated silicon composite carbon nanotube negative electrode material, In-situ polymerization of polyaniline on submicron or nano-sized silicon surface without organic solvent and simultaneous doping of conductive polymer polyaniline can effectively inhibit the volume expansion of silicon and provide good conductivity for silicon,and then polymerization of polyaniline with [pi]- [pi] conjugate effect, adding pre-dispersed carbon nanotubes, so that polyaniline coated silicon particles are uniformly dispersed and firmly fixed inthe carbon nanotube dispersion system. Carbon nanotubes with high conductivity and elasticity provide stable expansion elastic space and conductivity for polyaniline-coated silicon particles, which can completely solve the volume expansion of silicon and the destruction of negative electrode caused by pulverization. Polyaniline-coated silicon nanocomposite carbon nanotubes were synthesized. Underthe synergistic effect of silicon, polyaniline and carbon nanotubes, the content of elemental silicon can reach 50% and the specific capacity can reach more than 1800 mAh/g.

Description

technical field [0001] The invention belongs to the technical field of lithium battery negative electrode materials, and in particular relates to a conductive polymer-coated silicon composite carbon nanotube negative electrode material and its preparation method and application. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries are mainly graphite-based carbon anode materials, and their theoretical specific capacity is only 372mAh / g (LiC 6 ), severely restricting the further development of Li-ion batteries. Silicon-based materials are the research system with the highest theoretical specific capacity among the anode materials under research, and the alloy formed by them is Li x Si (x = 0 ~ 4.4), the theoretical specific capacity is as high as 4200mAh / g, because of its low lithium intercalation potential, low atomic mass, high energy density and high Li mole fraction in Li-Si alloy, it is considered as a carbon negative electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/587H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 周鲁中
Owner 淄博巨浪新能源科技有限公司
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