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Preparation method of surface-modified titanium sulfide battery negative electrode material

A technology of titanium carbon sulfide and battery negative electrode, which is applied in the field of preparation of surface-modified titanium carbon sulfide battery negative electrode materials, can solve the problems of restricting lithium storage potential, unfavorable lithium ion deintercalation, etc., and achieve lower diffusion energy barrier, low cost, The effect of low energy consumption

Active Publication Date: 2020-12-01
YANCHENG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But pure Ti 2 The interlayer bonding of SC is relatively tight, which is not conducive to the deintercalation of lithium ions in the electrochemical process, which restricts its lithium storage potential.

Method used

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  • Preparation method of surface-modified titanium sulfide battery negative electrode material
  • Preparation method of surface-modified titanium sulfide battery negative electrode material
  • Preparation method of surface-modified titanium sulfide battery negative electrode material

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Embodiment 1

[0028] A method for preparing a surface-modified titanium carbon sulfide battery negative electrode material, comprising the steps of:

[0029] (1) Put titanium powder, sulfur powder and graphite powder into the ball mill tank at a molar ratio of 2:1:1, and control the ball-material ratio in the tank to 4:1, and the mass ratio of small, medium and large steel balls to 3:4: 3. Pass argon as the protective gas, conduct ball milling, control the relative humidity ≤ 60%, set the parameters to 300r / min, and ball milling time to 3h, to obtain the mixed powder;

[0030] (2) Add the mixed powder into the self-propagating synthesis reaction kettle, pass argon as the protective gas, and keep the pressure in the reaction kettle at 0.26MPa after three times of gas washing, turn on the low-pressure ignition, and carry out the high-temperature self-propagating reaction (100°C, 5min), obtain block sample;

[0031] (3) Roughly crush the bulk sample and put it into the ball mill tank. Control...

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Abstract

The invention provides a preparation method of a surface-modified carbon sulfide titanium battery negative electrode material. The preparation method comprises mixing titanium powder, sulfur powder and graphite powder according to a mole ratio of (1.4-2.2): (0.8-1.2): (0.8-1.2), adding the mixed powder into a self-propagating synthesis reaction kettle, carrying out a high temperature self-propagating reaction process, carrying out ball milling treatment on the obtained blocky sample to obtain a powdery small-particle sample, adding the powdery small-particle sample into absolute ethyl alcohol,carrying out solvent ultrasonic treatment, centrifuging, drying to obtain titanium sulfide powder, mixing the titanium sulfide powder and sodium borohydride in a weight ratio of 1: 4 in an argon atmosphere, heating, and cooling to room temperature to obtain the titanium sulfide / sodium borohydride composite material. The method disclosed by the invention is simple to operate, low in energy consumption, low in cost and environment-friendly, and the prepared surface-modified titanium sulfide negative electrode material is high in specific capacity, has good conductivity, electrochemical activity, cycling stability and rate capability, and is suitable for a negative electrode of a lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing a surface-modified carbon sulfide titanium battery negative electrode material, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] The Barsoum team of Drexel University in the United States first came up with the definition of "MAX phase" in 2000. The full name of the MAX phase is M n+1 AX n phase (n is an integer from 1 to 3), the M element is a transition metal element, A can be the third or fourth main group element, and the X element is C or N. At present, Ti 3 SiC 2 and Ti 3 AlC 2 , while for Ti 2 SC is less concerned. As a member of the MAX phase, Ti 2 SC has special properties, and its lattice parameter ratio c / a is the smallest. Once the A-site element is introduced into S, at room temperature, its oxide SO 2 for gas. In addition, Ti 2 As a lithium-ion battery anode material, SC has a large lithium storage capacity, so it...

Claims

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Application Information

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IPC IPC(8): C01B32/907H01M4/583H01M10/0525
CPCC01B32/907H01M4/583H01M10/0525H01M2004/021H01M2004/027C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 许剑光陈晨龚晨曹可荃姚为
Owner YANCHENG INST OF TECH
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