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A preparation method of a three-dimensional porous lithium-ion battery silicon dioxide negative electrode material

A lithium-ion battery, silicon dioxide technology, applied in the directions of silicon dioxide, silicon oxide, battery electrodes, etc., can solve the problems that have not been reported in the literature, and achieve improved electrochemical performance, controllable process, and simple preparation process. Effect

Active Publication Date: 2022-05-27
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no literature has reported that SiO 2 Application of / Mxene composite materials in lithium-ion battery anode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] A method for preparing a three-dimensional porous silica negative electrode material for lithium ion batteries, comprising:

[0020] 1) Weigh a certain mass of MXene, metal framework compound precursor and methanol, and magnetically stir for 5h;

[0021] 2) Weigh the product of step 1), metal salt, surfactant, organic alkaline substance and water, mix, stir, and perform hydrothermal reaction at 120°C for 5h;

[0022] 3) The product of step 2) was set aside for 10h at 800°C in an argon atmosphere;

[0023] 4) Mix the product of step 3) with organosilicon, water and surfactant, and conduct hydrothermal reaction at 40°C for 5h;

[0024] 5) Immerse the product of step 4) in concentrated hydrochloric acid for 30 hours, wash and dry to obtain a three-dimensional porous silica negative electrode material for lithium ion batteries.

[0025] A composition design of a three-dimensional porous silica negative electrode material for lithium ion batteries, comprising:

[0026] 1)...

example 2

[0032] A method for preparing a three-dimensional porous silica negative electrode material for lithium ion batteries, comprising:

[0033] 1) Weigh a certain mass of MXene, metal framework compound precursor and methanol, and magnetically stir for 8h;

[0034]2) Weigh the product, metal salt, surfactant, organic alkaline substance and water in step 1), mix, stir, and perform hydrothermal reaction at 100°C for 8h;

[0035] 3) The product of step 2) was put on hold for 10h at 1000°C in an argon atmosphere;

[0036] 4) Mix the product of step 3) with organosilicon, water and surfactant, and conduct hydrothermal reaction at 40°C for 5h;

[0037] 5) Immerse the product of step 4) in concentrated hydrochloric acid for 20 hours, wash and dry to obtain a three-dimensional porous silica negative electrode material for lithium ion batteries.

[0038] A composition design of a three-dimensional porous silica negative electrode material for lithium ion batteries, comprising:

[0039] ...

example 3

[0045] The implementation steps are as in Example 1

[0046] 9) MoNb 2 SnC 2 , 0.01mol; ZIF-67, 0.002mol; NiCl 2 .6H 2 O, 0.005mol; Ethyl orthosilicate, 0.03mol;

[0047] 10) MoNb 2 SnC 2 , 0.01mol; ZIF-67, 0.003mol; NiCl 2 .6H 2 O, 0.005mol; Ethyl orthosilicate, 0.04mol;

[0048] 11) MoNb 2 SnC 2 , 0.01mol; ZIF-67, 0.004mol; NiCl 2 .6H 2 O, 0.005mol; Ethyl orthosilicate, 0.06mol;

[0049] 12) MoNb 2 SnC 2 , 0.01mol; ZIF-67, 0.005mol; NiCl 2 .6H 2 O, 0.005mol; Ethyl orthosilicate, 0.07mol;

[0050] The electrochemical test results show that the silica anode material has good electrochemical performance; the capacity of 100 cycles is higher than 1200ml / g at 0.1C current density.

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Abstract

The invention discloses a preparation method of a three-dimensional porous silicon dioxide negative electrode material for lithium-ion batteries; the interlayer distance of the two-dimensional material is enlarged through a metal skeleton compound; hydroxide is prepared through salt hydrolysis, and then treated at a high temperature, through carbon and The metal oxide reacts to obtain a three-dimensional porous structure; and through the three-dimensional porous Mxene as a carrier, the deposition of silicon dioxide is regulated; and a three-dimensional porous silicon dioxide negative electrode material for lithium-ion batteries is obtained. The silicon dioxide negative electrode material has good electrochemical properties and has good application prospects in the field of lithium ion batteries.

Description

technical field [0001] The patent of the present invention relates to an electrode material, in particular to a preparation method of a three-dimensional porous silica negative electrode material for lithium ion batteries. Background technique [0002] SiO 2 Has a high theoretical specific capacity (about 2600mAh g -1 ), low discharge voltage and other advantages, it has a good application prospect in lithium-ion batteries. Same as silicon anode, SiO 2 There are also problems of poor conductivity and volume expansion during charging and discharging. Carbon materials, conductive polymers, etc. with high conductivity and large specific surface area are used together with SiO 2 compound, is to improve the SiO 2 An efficient route to electrochemical performance. Wang Jianping [Wang Jianping, Tian Wenhuai, Yang Daojun, et al. Preparation of silicon / carbon composites by high temperature pyrolysis and their electrochemical properties. Chinese Journal of Engineering Science, 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01B32/05C01B32/90C01B32/921H01M4/48H01M10/0525
CPCC01B33/12C01B32/05C01B32/921C01B32/90H01M4/483H01M10/0525H01M2004/027Y02E60/10
Inventor 陈子昂俞思涵曹江行蒋洪敏马廷丽
Owner CHINA JILIANG UNIV