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a sio 2 /vo 2 Method for preparing silicon vanadium anode material for lithium ion battery by direct electrodeoxidation of mixture

A technology of lithium-ion batteries and negative electrode materials, applied in the direction of nanotechnology for materials and surface science, battery electrodes, active material electrodes, etc., to achieve the effects of low price, good cycle performance, and abundant sources

Active Publication Date: 2021-07-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanoscale metals, semiconductors, and composite materials with specific structures and morphologies, such as Ti, FeTi, NbC, TiV, etc., can be successfully prepared by molten salt electrolysis, but so far there has been no research on the use of molten salt electrolysis of SiO 2 / VO 2 Preparation of Nanoscale Silicon-Vanadium Composite Materials for Lithium-ion Batteries Using Mixed Materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The SiO 2 / VO 2 The method for preparing the silicon vanadium negative electrode material for lithium-ion batteries by direct electrodeoxidation of the mixture, the specific steps are as follows:

[0019] Step 1. Using micro-nano-scale SiO 2 and VO 2 The powder is used as the raw material and ground for 0.5 hours according to the mass ratio of 1:3 and mixed evenly to obtain a mixture (the total mass of the mixture is 1.0g). After h, the electrolytic raw material is prepared; wherein SiO 2 and VO 2 The particle size distribution of powder particles is 0.1~2μm;

[0020] Step 2, roasting the electrolysis raw material obtained in step 1 in an air atmosphere and a tube furnace at 500° C. for 3 hours to obtain an electrolysis cathode;

[0021] Step 3, using graphite as the anode, the electrolytic cathode prepared in step 2 as the cathode, and using CaCl 2 - x M molten salt system is electrolyte (CaCl 2 - x M molten salt system x is the mass percentage of the molten...

Embodiment 2

[0024] The SiO 2 / VO 2 The method for preparing the silicon vanadium negative electrode material for lithium-ion batteries by direct electrodeoxidation of the mixture, the specific steps are as follows:

[0025] Step 1. Using micro-nano-scale SiO 2 and VO 2 The powder is used as the raw material and ground for 0.8 hours according to the mass ratio of 1:4.23 and mixed evenly to obtain a mixture (the total mass of the mixture is 2.0g). After h, the electrolytic raw material is prepared; wherein SiO 2 and VO 2 The particle size distribution of powder particles is 0.1~2μm;

[0026] Step 2, roasting the electrolysis raw material obtained in step 1 in an air atmosphere and a tube furnace at 500° C. for 4 hours to obtain an electrolysis cathode;

[0027] Step 3, using graphite as the anode, the electrolytic cathode prepared in step 2 as the cathode, and using CaCl 2 - x M molten salt system is electrolyte (CaCl 2 - x M molten salt system x Molten salt M is a mixture of NaC...

Embodiment 3

[0030] The SiO 2 / VO2 The method for preparing the silicon vanadium negative electrode material for lithium-ion batteries by direct electrodeoxidation of the mixture, the specific steps are as follows:

[0031] Step 1. Using micro-nano-scale SiO 2 and VO 2 The powder is used as the raw material and ground for 0.8 hours according to the mass ratio of 1:6.75 and mixed evenly to obtain a mixture (the total mass of the mixture is 2.6g). After h, the electrolytic raw material is prepared; wherein SiO 2 and VO 2 The particle size distribution of powder particles is 0.1~2μm;

[0032] Step 2, roasting the electrolysis raw material obtained in step 1 in an air atmosphere and a tube furnace at 600° C. for 5 hours to obtain an electrolysis cathode;

[0033] Step 3, using graphite as the anode, the electrolytic cathode prepared in step 2 as the cathode, and using CaCl 2 - x M molten salt system is electrolyte (CaCl 2 - x M molten salt system x For the molten salt M is CaO, x is...

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Abstract

The present invention relates to a SiO 2 / VO 2 The invention discloses a method for preparing a silicon-vanadium negative electrode material for a lithium-ion battery by direct electrodeoxidation of a mixture, and belongs to the technical field of non-ferrous metal metallurgy. Micro-nano-scale SiO 2 and VO 2 The powder is used as the raw material to be ground for 0.5~1h and mixed evenly to obtain a mixture, and the binder polyvinyl alcohol with a weight of 40~60% of the mixture is added to the mixture, and then the electrolytic raw material is prepared after continuing to grind for 0.5h; the obtained electrolytic raw material is Air atmosphere, 500~600℃ tube furnace roasting for 3~5h to get electrolysis cathode; graphite as anode, electrolysis cathode as cathode, CaCl 2 - x The M molten salt system is an electrolyte. Under the cell voltage of 2.6~2.8V, the electrolysis temperature is controlled at 650~1000℃, and the electrolysis time is 3~5h. After the reaction is terminated, after the electrolyte molten salt is cooled, the electrolysis product at the cathode is taken out and deionized After water rinsing and drying, a silicon vanadium composite material is obtained. The method has easy-to-obtain raw materials and short technological process.

Description

technical field [0001] The present invention relates to a SiO 2 / VO 2 The invention discloses a method for preparing a silicon-vanadium negative electrode material for a lithium-ion battery by direct electrodeoxidation of a mixture, belonging to the technical field of non-ferrous metal metallurgy. Background technique [0002] The world economy and human life are increasingly demanding energy and the environment under the background of the rapid development of globalization. The consumption of non-renewable energy such as coal, oil and natural gas has also caused a series of energy problems, which has caused great harm to the global environment. harm. Vigorously developing clean energy is an effective way to solve the above problems. Electrochemical energy storage system is one of the important means to realize energy conversion and storage. Among them, lithium-ion batteries have the advantages of high working voltage, long cycle life, high energy density, stable discharg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C25C7/02H01M4/38H01M4/62B82Y30/00
CPCB82Y30/00C25C3/36C25C7/025H01M4/386H01M4/628H01M2004/021H01M2004/027Y02E60/10
Inventor 董鹏周忠仁张英杰华一新徐明丽李雪张举峰黄雪松
Owner KUNMING UNIV OF SCI & TECH