Composite electrode material with reticulate coating structure as well as preparation method and application of composite electrode material
A composite electrode, lithium-ion battery technology, applied in the field of electrochemistry, can solve the problems of poor cycle performance, short service life, large volume change of silicon particles, etc., to achieve the effect of improving cycle stability and power performance
Inactive Publication Date: 2019-09-06
TSINGHUA UNIV
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[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 Novel Composite Electrode Material with Reticular Covering Structure
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Embodiment 1
[0039] This embodiment provides a method for preparing a negative electrode of a composite electrode material with a net-like coating structure, such as figure 1 shown, including:
[0040] (1) By etching the precursor Ti 3 AlC 2 , to prepare an aqueous solution of two-dimensional transition metal carbide MXene: 1 g of lithium fluoride (LiF) powder was completely dissolved in 20 mL of 9M hydrochloric acid (HCl) solution, and then 1 g of Ti 3 AlC 2 , the solution was reacted at 35°C for 24 hours to 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.
[0041] (2) Add silicon nanoparticles and carbon nanotubes to the aqueous solution of MXene, and ultrasonically stir for 20 minutes;
[0042] (3) Prepare a composite electrode material with a three-dimensional network coating structure by suction filtration, and ...
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Abstract
The invention relates to the field of electrochemistry, and in particular relates to a composite electrode material with a reticulate coating structure as well as a preparation method and applicationof the composite electrode material. The composite electrode material comprises a three-dimensional cross-linked net-shaped framework structure, a carbon nano tube and silicon nano-particles; the three-dimensional cross-linked net-shaped framework structure is composed of a plurality of unit spaces; the unit spaces are formed by cross-linking adjacent sheet layers; each sheet layer is formed by two-dimensional transition metal carbide or carbonitride; the carbon nano tube is scattered and supported in the unit spaces; and the silicon nano-particles are wrapped in the unit spaces. The compositeelectrode material can be used as a negative electrode material of a lithium ion battery, and the cycling stability and the power performance of the lithium ion battery can be greatly improved.
Description
technical field [0001] The invention relates to the field of electrochemistry, in particular to a composite electrode material with a net-like coating structure and a preparation method and application thereof. 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 cu...
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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/58H01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 王晓红胡丙萌
Owner TSINGHUA UNIV