A kind of three-dimensional cross-linked structure composite electrode material and its preparation method and application

A composite electrode, lithium-ion battery technology, applied in the field of electrochemistry, can solve the problems of short service life, large volume change of silicon particles, low conductivity, etc., to maintain structural integrity, shorten transmission path, and long service life. Effect

Active Publication Date: 2021-01-12
TSINGHUA UNIV
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Problems solved by technology

[0008] In order to solve the problems of rapid battery capacity decay, poor cycle performance, short service life and low battery power density due to the large volume change of silicon particles and low conductivity of the silicon negative electrode material of lithium-ion batteries, the present invention proposes A three-dimensional cross-linked structure composite electrode material

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  • A kind of three-dimensional cross-linked structure composite electrode material and its preparation method and application
  • A kind of three-dimensional cross-linked structure composite electrode material and its preparation method and application
  • A kind of three-dimensional cross-linked structure composite electrode material and its preparation method and application

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Embodiment 1

[0041] This embodiment provides a method for preparing a composite electrode material with a three-dimensional crosslinked structure, including:

[0042] (1) By etching the precursor Ti 3 AlC 2 , to prepare an aqueous solution of two-dimensional transition metal carbide MXene: completely dissolve 1 g of lithium fluoride (LiF) powder in 20 mL of 9M hydrochloric acid (HCl) solution, then gradually add 1 g of Ti3AlC2, and react the solution at 35 °C After 24 hours, remove the Al layer. Wash with deionized water centrifugation for 5 minutes, and circulate until the pH of the solution reaches greater than 6. The resulting solution was diluted 50 times and then sonicated for 1 hour.

[0043] (2) After ball milling the silicon nanoparticles and the PVA for 1 hour according to the mass ratio of 1:1, add the two-dimensional transition metal carbide (MXene) aqueous solution to disperse, so as to obtain the aqueous dispersion of the two;

[0044] (3) ultrasonically mixing the aqueous...

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Abstract

The invention relates to the field of electrochemistry, in particular to a three-dimensional crosslinked structure composite electrode material and a preparation method thereof and application. The composite electrode material comprises multiple space units, amorphous carbon and silica nanoparticles, wherein the space unit is formed by cross-linking of adjacent sheet layers, and the sheet layer is formed by two-dimensional transition metal carbide or carbonitride; the amorphous carbon is dispersed and supported in the space unit; and the silica nanoparticles are coated in the space units. The composite electrode material can be used as a lithium ion battery negative electrode material, and has the advantages of high mass ratio capacity, good cycle property, long service life, high power and the like.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a three-dimensional cross-linked structure composite electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries have high energy density, high average output voltage, low self-discharge, no memory effect, long service life, relatively low safety cost, good cycle performance, large operating voltage range, no memory effect, high cycle life, green Environmental protection and other advantages are widely used in various portable energy storage devices and equipment. The performance of lithium-ion batteries mainly depends on the anode and cathode materials, and the development of anode materials with higher energy density is one of the current research priorities. [0003] The anode materials of lithium-ion batteries are divided into carbon-based anode materials and non-carbon-based anode materials. Carbon-based materials are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 王晓红胡丙萌
Owner TSINGHUA UNIV
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