Preparation method of lithium ion battery nanoporous silicon negative electrode material

A lithium-ion battery, nanoporous technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of commercial scale application of difficult silicon-based negative electrode materials, complex processing technology, low output, etc., to achieve resource utilization Utilization, improvement of coulombic efficiency, and improvement of electrical conductivity

Active Publication Date: 2019-10-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used preparation methods of nanoporous silicon and its composite materials (such as chemical vapor deposition technology, magnetron sputtering technology, plasma processing and magnesium thermal reduction technology, etc.) often require expensive equipment, and the processing technology is relatively complicated, and the output Low and high cost, it is difficult to realize the commercial scale application of silicon-based anode materials and other issues

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  • Preparation method of lithium ion battery nanoporous silicon negative electrode material
  • Preparation method of lithium ion battery nanoporous silicon negative electrode material
  • Preparation method of lithium ion battery nanoporous silicon negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: A kind of preparation method of nanoporous silicon negative electrode material of lithium ion battery, concrete steps are as follows:

[0034] (1) In a protective gas (nitrogen) atmosphere, pulverize the high-purity silicon material to obtain micro-nano silicon powder with a particle size of less than 30 μm, wash it with deionized water for 3 times at room temperature, and wash it for 20 minutes each time, then dry it ;

[0035] (2) Add silicon powder in step (1) to the metal salt / HF / alcohol mixed solution system A, wherein the metal salt / HF / alcohol mixed solution system A contains a reducing agent to enhance the crushing effect. Under the condition of ℃, the one-step metal nanoparticle assisted etching method is used for crushing pretreatment for 120 minutes, and the metal nanoparticles on the surface of the silicon powder are removed by washing with detergent for 30 minutes. The metal salt in the quasi-mixed solution system A is Cu(NO 3 ) 2 , the alco...

Embodiment 2

[0040] Embodiment 2: a kind of preparation method of nanoporous silicon negative electrode material of lithium ion battery, concrete steps are as follows:

[0041] (1) In a protective gas (nitrogen) atmosphere, crush and finely grind the screened waste silicon slag from the photovoltaic industry to obtain micro-nano silicon powder with a particle size of less than 30 μm. 20min, drying;

[0042] (2) Add silicon powder in step (1) to the metal salt / HF / alcohol mixed solution system A, wherein the metal salt / HF / alcohol mixed solution system A contains a reducing agent to enhance the crushing effect. Under the condition of ℃, the one-step metal nanoparticle assisted etching method is used for crushing pretreatment for 60 minutes, and the metal nanoparticles on the surface of the silicon powder are removed by washing with detergent for 100 minutes, solid-liquid separation, and drying to obtain nano-scale silicon powder. The metal salt in the quasi-mixed solution system A is Cu(NO ...

Embodiment 3

[0046] Embodiment 3: A kind of preparation method of nanoporous silicon negative electrode material of lithium ion battery, concrete steps are as follows:

[0047] (1) In a protective gas (nitrogen) atmosphere, crush and finely grind the screened waste silicon slag from the photovoltaic industry to obtain micro-nano silicon powder with a particle size of less than 30 μm. 20min, drying;

[0048] (2) Add the silicon powder in step (1) to the metal salt / HF / alcohol mixed solution system A, wherein the metal salt / HF / alcohol mixed solution system A contains a reducing agent to enhance the crushing effect. Under the condition of ℃, a one-step metal nanoparticle assisted etching method was used for crushing pretreatment for 90 minutes, and detergent was used for 30 minutes to remove metal nanoparticles on the surface of silicon powder, solid-liquid separation, and drying to obtain nano-scale silicon powder; where metal salt / HF / alcohol The metal salt in the quasi-mixed solution system...

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Abstract

The invention relates to a preparation method of lithium ion battery nanoporous silicon negative electrode material, and belongs to the technical field of new energy materials and electrochemistry. The silicon material crushed and finely ground into the micro-nano silicon powder in the protective gas atmosphere, and then crushing pretreatment is performed and the metal nanoparticles on the surfaceof the silicon powder are washed away and dried so as to obtain the nano silicon powder; one-step or two-step metal nanoparticle assisted chemical etching is performed on the nano silicon powder, solid-liquid separation and drying are performed so as to obtain nanoporous silicon/metal composite material; or a detergent is applied to remove the metal nanoparticles on the surface of the nanoporoussilicon, solid-liquid separation and drying are performed so as to obtain the nanoporous silicon; and the nanoporous silicon/metal composite material or the nano-porous silicon is oxidized so as to obtain an oxidized nano-porous silicon/metal composite material or oxidized nano-porous silicon, and the nanoporous silicon/metal composite material, the nanoporous silicon, the oxidized nanoporous silicon/metal composite material or the oxidized nanoporous silicon are the lithium ion battery nanoporous silicon negative electrode material.

Description

technical field [0001] The invention relates to a preparation method of a nanoporous silicon negative electrode material for a lithium ion battery, and belongs to the technical fields of new energy materials and electrochemistry. Background technique [0002] Among many energy storage systems, lithium-ion batteries are considered to be the most promising energy storage devices due to their advantages of long life, light weight, safe use, and environmental protection. In recent years, with the development of electric vehicles, hybrid vehicles and large-scale energy storage equipment, higher requirements have been put forward for the next generation of new lithium-ion batteries in terms of cost, energy density, rate performance and cycle stability. The low theoretical specific capacity (372mAh / g) of traditional graphite anode has been difficult to meet the application requirements of new high specific energy batteries. The development of high capacity, long life and safe lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525
CPCH01M4/386H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 马文会席风硕李绍元张钊崔洪旗杨婷婷魏奎先陈正杰谢克强伍继君雷云杨斌戴永年
Owner KUNMING UNIV OF SCI & TECH
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