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Preparation method and application of self-supporting binder-free flexible SiO2@C composite material

A binder-free, composite material technology, applied in structural parts, active material electrodes, electrical components, etc., to achieve the effect of small size, favorable for electron transmission, and strong crystallinity

Active Publication Date: 2020-07-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a self-supporting adhesive-free flexible SiO 2 Preparation method and application of @C composite materials to relieve SiO 2 Large volume changes during charge and discharge, poor conductivity, and poor electrode stability

Method used

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  • Preparation method and application of self-supporting binder-free flexible SiO2@C composite material
  • Preparation method and application of self-supporting binder-free flexible SiO2@C composite material
  • Preparation method and application of self-supporting binder-free flexible SiO2@C composite material

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preparation example Construction

[0018] The present invention provides a free-standing binder-free flexible SiO 2 The preparation method and application of @C composite material, comprising the following steps:

[0019] S1. Acidification treatment of carbon cloth;

[0020] Pretreat the carbon cloth, cut the carbon cloth into a cube of 3cm×3cm×0.1cm, soak it in a hydrochloric acid solution with a concentration of 1mol / L for 12 hours, and then wash it alternately with deionized water and ethanol for 3 times and then 60°C Dry to obtain acidified carbon cloth A;

[0021] S2, preparation of precursor solution;

[0022] Mix 0.1~0.5mL tetraethyl tetrasilicate (TEOS) and 10~60ml deionized water, and stir for 1~2 hours to obtain solution B; mix solution B with 0.05~0.2ml 25% ammonia water and stir for 1~ Solution C was obtained after 2 hours;

[0023] S3, free-standing flexible SiO without binder 2 Preparation of @C composite materials

[0024] Put the carbon cloth A and solution C into the reaction kettle toget...

Embodiment 1

[0031] S1. Acidification treatment of carbon cloth;

[0032] Pre-treat the carbon cloth, cut the carbon cloth into a cube of 3cm×3cm×0.1cm, soak it in a hydrochloric acid solution with a concentration of 1mol / L for 12 hours, and then wash it alternately with deionized water and ethanol for 3 times before 60°C Obtain acidified carbon cloth A after drying;

[0033] S2, preparation of precursor solution;

[0034] Mix 0.1mL tetraethyl orthosilicate (TEOS) and 10ml deionized water, and stir for 1 hour to obtain solution B; mix solution B with 0.05ml 25% ammonia water and stir for 1 hour to obtain solution C;

[0035] S3, free-standing flexible SiO without binder 2 Preparation of @C composite materials

[0036] Put the carbon cloth A and the solution C into the reaction kettle together, and react at 180°C for 10 hours; after the reaction, take out the carbon cloth, wash it with water and alcohol three times, and then dry it at 80°C to obtain a self-supporting non-adhesive flexib...

Embodiment 2

[0042] S1. Acidification treatment of carbon cloth;

[0043]Pre-treat the carbon cloth, cut the carbon cloth into a cube of 3cm×3cm×0.1cm, soak it in a hydrochloric acid solution with a concentration of 1mol / L for 12 hours, and then wash it alternately with deionized water and ethanol for 3 times before 60°C Obtain acidified carbon cloth A after drying;

[0044] S2, preparation of precursor solution;

[0045] Mix 0.53mL tetraethyl orthosilicate (TEOS) and 40ml deionized water, and stir for 2 hours to obtain solution B; mix solution B with 0.15ml 25% ammonia water and stir for 1 hour to obtain solution C;

[0046] S3, free-standing flexible SiO without binder 2 Preparation of @C composite materials

[0047] Put the carbon cloth A and solution C into the reaction kettle together, and react at 200°C for 10 hours; after the reaction, take out the carbon cloth, wash with water and alcohol three times, and then dry at 80°C to obtain a self-supporting non-adhesive flexible SiO 2...

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Abstract

The invention discloses a preparation method and application of a self-supporting binder-free flexible SiO2@C composite material. The self-supporting binder-free flexible SiO2@C composite material isprepared by adopting a one-step hydrothermal method, and the synthesis process is simple and easy to operate. Moreover, carbon cloth is selected as a carbon substrate, and the material is cheap and easily available. Besides, nanoscale SiO2 particles are provided with more lithium ion contact sites on the surfaces and can be sufficiently reacted with lithium, and the carbon cloth is used as a SiO2particle carrier, so that the nano particles are uniformly distributed on the surface of the carbon fiber, and the problem that the nano particles are easy to agglomerate is solved. In addition, carbon fibers can form a conductive carbon fiber network, electrons are easy to transmit, and the electrons are smooth and unobstructed on the whole flexible substrate.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a self-supporting flexible SiO2 without binder 2 Preparation methods and applications of @C composite materials. Background technique [0002] With the rapid development of portable devices, such as mobile phones and notebook computers, people are increasingly demanding high-capacity and high-energy-density lithium-ion batteries. However, the reversible capacity of graphite anodes in Li-ion batteries is only ~372 mA h g -1 . Unfortunately, using lithium metal as a battery material anode is extremely difficult because dendrites are easily formed on the surface of lithium anodes. In recent years, researchers have shown great interest in developing new high-capacity anode materials such as alloys and carbon-based composites. It is well known that some elements can electrochemically react with lithium to form lithium alloys and generate high capacity. Among these e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/628H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 杨艳玲孙瑜侯小江陈志刚朱建锋邹鑫鑫陈华军锁国权毕雅欣和茹梅冯雷叶晓慧张荔
Owner SHAANXI UNIV OF SCI & TECH
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