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Core-shell structure nanometer silicon-Mxene composite cathode material and preparation method thereof

A core-shell structure and negative electrode material technology, applied in nanotechnology, nanotechnology, structural parts, etc., can solve the problems of large specific surface area, increased side reactions, and limited electrochemical performance of nanoparticle materials, so as to improve electrical conductivity, improve Specific capacity and cycling stability, effect of buffer volume expansion

Inactive Publication Date: 2019-02-15
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area of ​​nanoparticle materials is huge, and the side reactions between them and the electrolyte increase during the cycle, which limits the improvement of their electrochemical performance.

Method used

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  • Core-shell structure nanometer silicon-Mxene composite cathode material and preparation method thereof
  • Core-shell structure nanometer silicon-Mxene composite cathode material and preparation method thereof
  • Core-shell structure nanometer silicon-Mxene composite cathode material and preparation method thereof

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preparation example Construction

[0024] The present invention also discloses a method for preparing a core-shell structure nano-silicon-MXene composite negative electrode material, which includes the following steps:

[0025] (1) Using the ceramic phase precursor MAX as the raw material, the MXene material was obtained after etching with HCl+LiF and washing with deionized water. Specifically, the ceramic phase precursor MAX raw material is immersed in the HCl+LiF mixed etchant for stirring etching; the stirring time is 5-15min, the stirring rate is 200-800rpm, and the mass volume ratio of LiF to HCl is 1 (g): 5-15 (mL), the mass ratio of the amount of MAX phase to LiF is 1:1.05; the etched sample is transferred to a plastic centrifuge tube for centrifugation, then washed with deionized water for 3 times, centrifugally filtered, and then Shock treatment in 1mol / L KOH solution for 12h, with 30% H 2 o 2 Soak in the solution for 12 hours, wash with deionized water, and dry to obtain a two-dimensional layered MX...

Embodiment 1

[0031] A preparation method of a core-shell structure nano-silicon-MXene composite negative electrode material, comprising the following steps:

[0032] (1) Using the ceramic phase precursor MAX as the raw material, the MXene material was obtained after etching with HCl+LiF and washing with deionized water. Specifically, the ceramic phase precursor MAX raw material is immersed in the HCl+LiF mixed etchant for stirring etching; the stirring time is 15min, the stirring rate is 600rpm, and the mass volume ratio of LiF to HCl is 1 (g): 12 (mL) , the mass ratio of the amount of MAX phase to LiF was 1:1.05; the etched sample was transferred to a plastic centrifuge tube for centrifugation, then washed 3 times with deionized water, centrifugally filtered, and then in 1mol / L KOH solution Medium shock treatment for 12h, with 30% H 2 o 2 Soak in the solution for 12 hours, wash with deionized water, and dry to obtain a two-dimensional layered MXene material whose surface functional grou...

Embodiment 2

[0036] A preparation method of a core-shell structure nano-silicon-MXene composite negative electrode material, comprising the following steps:

[0037] (1) Using the ceramic phase precursor MAX as the raw material, the MXene material was obtained after etching with HCl+LiF and washing with deionized water. Specifically, the ceramic phase precursor MAX raw material is immersed in the HCl+LiF mixed etchant for stirring etching; the stirring time is 5min, the stirring rate is 200rpm, and the mass volume ratio of LiF to HCl is 1 (g): 10 (mL) , the mass ratio of the amount of MAX phase to LiF was 1:1.05; the etched sample was transferred to a plastic centrifuge tube for centrifugation, then washed 3 times with deionized water, centrifugally filtered, and then in 1mol / L KOH solution Medium shock treatment for 12h, with 30% H 2 o 2 Soak in the solution for 12 hours, wash with deionized water, and dry to obtain a two-dimensional layered MXene material whose surface functional group...

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Abstract

The invention discloses a core-shell structure nanometer silicon-Mxene composite cathode material and a preparation method thereof. During preparation, the core-shell structure nanometer silicon-Mxenecomposite cathode material comprises the following steps: (1) using a ceramic phase precursor MAX as a raw material, etching the ceramic phase precursor MAX by using HCl+LiF and using deionized waterto wash the ceramic phase precursor MAX to obtain an MXene material; (2) adding the MXene material to a nanometer silicon suspension liquid; carrying out high energy ball milling and dispersing on the MXene material so as to obtain a nanometer silicon-Mxene composite turbid liquid; and drying the nanometer silicon-Mxene composite turbid liquid to obtain a nanometer silicon-Mxene composite powder;and (3) coating the nanometer silicon-Mxene composite powder by using asphalt, and carbonizing the nanometer silicon-Mxene composite powder to prepare the core-shell structure nanometer silicon-Mxenecomposite cathode material. The core-shell structure nanometer silicon-Mxene composite cathode material disclosed by the invention has the advantages that the nanometer silicon and the Mxene with a two-dimensional layer structure are combined by using a high energy ball milling method, and a core-shell structure of a porous network is designed; and therefore, volume expansion in the nanometer silicon particle charging and discharging process can be effectively buffered, direct contact between electrolyte and a silicon interface is stopped, the electrical conductivity of an active substance isimproved, so that the specific capacity and cycling stability of a lithium ion battery are improved in a coordinated manner.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a core-shell structure nano-silicon-MXene composite negative electrode material and a preparation method thereof. Background technique [0002] In recent years, two-dimensional materials have shown great advantages in the field of energy storage due to their large specific surface area and short ion transport path. MXene is a type of two-dimensional transition metal carbide with a graphene-like structure. The general formula can be expressed as M n+1 x n T x (n=1, 2, 3, M is a transition metal element, X is carbon or nitrogen, T represents a functional group generated during the preparation process), MXene has good hydrophilicity, large specific surface area, good conductivity, and fast charge response The advantages of fast, pseudocapacitive characteristics and stable cycle life have great potential in energy storage. [0003] MXene contains an at...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 黄技军赵东辉周鹏伟李冰蟾
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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