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Method for preparing lithium ion battery silicon-carbon anode material by using carbon nanotube

A lithium-ion battery, carbon nanotube technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of rapid capacity decay, complex preparation methods, poor conductivity, etc., and achieves low equipment requirements, simple and easy operation, The effect of low energy consumption

Active Publication Date: 2019-05-31
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, the shortcomings of the silicon material itself are also extremely significant, such as poor electrical conductivity, poor cycle performance, and high expansion rate; current research generally uses the carbon-silicon composite method to avoid disadvantages, but the uniformity of silicon-carbon composites, capacity The problems of fast attenuation, poor rate performance, and complicated preparation methods have not yet been overcome
[0003] Carbon nanotubes can effectively solve the above problems; carbon nanotubes are a one-dimensional nanomaterial with a radial dimension of the order of nanometers and an axial dimension of the order of micrometers. An excellent conductor of ions and electrons. Lithium ions and electrons reach silicon particles through carbon tubes for intercalation and detachment, which maximizes the advantages of silicon; however, carbon nanotubes are prone to agglomeration and entanglement. Excellent performance, how to uniformly disperse and immobilize carbon nanotubes in silicon carbon anode materials is a key problem to solve its efficient application

Method used

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Embodiment 1

[0027] Embodiment 1: The method for preparing the silicon-carbon negative electrode material of lithium-ion batteries by using carbon nanotubes is as follows:

[0028] (1) According to the mass ratio of silicon powder: multi-walled carbon nanotubes: polyvinylpyrrolidone = 1:0.1:0.1, weigh silicon powder (the particle size of silicon powder is 40nm), multi-walled carbon nanotubes (diameter is 20nm), polyvinylpyrrolidone, put the three in the same beaker, and dissolve them in water with magnetic stirring according to the ratio of mass volume ratio g:mL of 1:50, and then use a high-speed shearing machine to shear at 8000r / min Shear the mixture at a shear speed for 1h to obtain a mixed solution;

[0029] (2) Weigh the sucrose according to the ratio of 1:0.5 mass ratio of sucrose:silicon powder, dissolve the sucrose in water according to the mass ratio of 1:2, stir and mix well, and then add to the mixed solution in step (1) with magnetic stirring Mix well, and place the mixed sol...

Embodiment 2

[0032] Embodiment 2: The method for preparing the silicon-carbon negative electrode material of lithium-ion batteries by using carbon nanotubes is as follows:

[0033] (1) According to the mass ratio of silicon powder: multi-walled carbon nanotubes: polyvinylpyrrolidone = 1:0.2:0.5, weigh silicon powder (the particle size of silicon powder is 60nm), multi-walled carbon nanotubes (diameter is 25nm), polyvinylpyrrolidone, put the three in the same beaker, mechanically stir and dissolve them in water according to the ratio of mass to volume ratio g:mL of 1:70, and then use a high-speed shearing machine to shear at 5000r / min The shear speed shears the mixture for 2h to obtain a mixed solution;

[0034] (2) Weigh the sucrose according to the ratio of 1:2 mass ratio of sucrose:silicon powder, dissolve the sucrose in water according to the ratio of 1:5 and mix mechanically, then add the magnetic Stir and mix well, place the mixed solution in a 70°C water bath for magnetic stirring f...

Embodiment 3

[0037] Embodiment 3: The method for preparing the silicon-carbon negative electrode material of lithium-ion batteries by using carbon nanotubes is as follows:

[0038] (1) Weigh according to the mass ratio of silicon powder: multi-walled carbon nanotubes: polyvinylpyrrolidone = 1:1:1 (the particle size of silicon powder is 80nm), multi-walled carbon nanotubes (diameter is 30nm) , polyvinylpyrrolidone, the three are placed in the same beaker, dissolved in water at a ratio of 1:95 according to the mass volume ratio g:mL, and then the mixture is mixed with a high-speed shearing machine at a shear rate of 3000r / min. Cut for 3h to obtain a mixed solution;

[0039] (2) Weigh the sucrose according to the mass ratio of sucrose:silicon powder of 1:5, dissolve the sucrose in water with a mass ratio of 1:10 and stir it evenly, then add it to the mixed solution in step (1) and mechanically Stir and mix well, place the mixed solution in a water bath at 60°C for magnetic stirring for 8 hours...

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Abstract

The invention discloses a method for preparing a lithium ion battery silicon-carbon anode material by using a carbon nanotube. The method of the invention comprises dispersing and fixing the carbon nanotube and carbonizing a precursor. The method shortens and disperses the carbon nanotube by high-speed emulsification shearing. A dispersing agent keeps the carbon nanotube in a highly dispersed state, thereby solving the problem that the carbon nanotube is difficult to disperse and easy to agglomerate. By freeze drying, an organic carbon source fixes the highly dispersed carbon nanotube / nanosilicon. The carbon nanotube / nanosilicon is coated with carbon after the carbonization by the organic carbon source so as to achieve a purpose of efficiently preparing the lithium ion electronic silicon-carbon anode material from the carbon nanotube. The method of the invention is environmentally friendly and reproducible, is simple and easy, and low in equipment requirement and low in energy consumption, and can achieve large-scale production.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing silicon carbon negative electrode materials for lithium ion batteries by using carbon nanotubes. Background technique [0002] In order to meet the increasing demand for lithium-ion battery capacity and energy density in new energy vehicles and portable devices, carbon-silicon anode materials have become one of the leading development directions for lithium-ion battery anode materials in the future. The development of carbon-silicon anode materials is based on the use of silicon's ultra-high theoretical capacity and low lithium intercalation potential, and silicon is rich in resources and environmentally friendly. However, the shortcomings of the silicon material itself are also extremely significant, such as poor electrical conductivity, poor cycle performance, and high expansion rate; current research general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 姚耀春徐汝辉梁风张克宇杨斌马文会徐宝强
Owner KUNMING UNIV OF SCI & TECH
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