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Preparation method of functional interlayer of lithium-sulfur battery

A lithium-sulfur battery, a functional technology, applied in the field of material chemistry, which can solve problems such as capacity loss, cycle decay, and safety hazards

Active Publication Date: 2020-06-26
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the conductivity of sulfur cathode material is very poor, and elemental sulfur is an insulator of electrons and ions at room temperature (conductivity is 5×10S / cm), which makes it very difficult for the battery to discharge under high current; secondly, in the process of charging and discharging The positive electrode will generate polysulfides, which can be dissolved in the electrolyte and accumulate to the negative electrode through the separator, and react with lithium metal on the negative electrode to cause capacity loss and cycle attenuation, resulting in a "shuttle effect"; As a negative electrode, it is easy to generate lithium crystal dendrites, and it is easy to pierce the separator and cause a short circuit, which poses a safety hazard.

Method used

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  • Preparation method of functional interlayer of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first step is to prepare MXene materials:

[0022] Immerse the ground MAX phase ceramic powder in HF solution (mass fraction 40%), raise the temperature to 60°C, stir magnetically for 18 hours, then centrifuge to obtain the product, wash it with deionized water until neutral, and place it in an oven at 70°C The MXene material was obtained after drying for 18 hours. The MAX phase ceramic can be Ti 3 AlC 2 、Ti 2 AlC, Cr 2 One or more of AlC. The obtained MXene material can be Ti 3 C 2 T x (T x is -OH or -F functional group), Ti 2 CT x (Tx is -OH or -F functional group), Cr 2 CT x (T x One or more of -OH or -F functional groups).

[0023] The second step is to prepare zinc oxide-coated MXene materials:

[0024] Take 0.8g of the MXene powder prepared in the first step and evenly spread it on the bottom of the porcelain boat, then configure a zinc acetate-ethanol solution with a concentration of 0.2mol / L, use the drop coating method to drip the powder unti...

Embodiment 2

[0028] The first step is to prepare MXene materials:

[0029] Immerse the ground MAX phase ceramic powder in HF solution (mass fraction is 50%), raise the temperature to 90°C, stir magnetically for 24 hours, then centrifuge to obtain the product, wash it with deionized water until neutral, and place it in an oven at 80°C The MXene material was obtained after drying for 24 hours. The MAX phase ceramic can be Ti 3 AlC 2 、Ti 2 AlC, Cr 2 One or more of AlC. The obtained MXene material can be Ti 3 C 2 T x (T x is -OH or -F functional group), Ti 2 CT x (Tx is -OH or -F functional group), Cr 2 CT x (T x One or more of -OH or -F functional groups).

[0030] The second step is to prepare zinc oxide-coated MXene materials:

[0031] Take 1g of the MXene powder prepared in the first step and evenly spread it on the bottom of the porcelain boat, then configure a zinc acetate-ethanol solution with a concentration of 0.5mol / L, use the drop coating method to drip the powder unt...

Embodiment 3

[0035] The first step is to prepare MXene materials:

[0036]Immerse the ground MAX phase ceramic powder in HF solution (mass fraction is 30%), raise the temperature to 50°C, stir magnetically for 12 hours, then centrifuge to obtain the product, wash it with deionized water until neutral, and place it in an oven at 60°C The MXene material was obtained after drying for 12 hours. The MAX phase ceramic can be Ti 3 AlC 2 、Ti 2 AlC, Cr 2 One or more of AlC. The obtained MXene material can be Ti 3 C 2 T x (T x is -OH or -F functional group), Ti 2 CT x (Tx is -OH or -F functional group), Cr 2 CT x (T x One or more of -OH or -F functional groups).

[0037] The second step is to prepare zinc oxide-coated MXene materials:

[0038] Take 0.5g of the MXene powder prepared in the first step and evenly spread it on the bottom of the porcelain boat, then configure a zinc acetate-ethanol solution with a concentration of 0.05mol / L, use the drop coating method to drip the powder u...

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Abstract

The invention relates to a preparation method of a functional interlayer of a lithium-sulfur battery. The method comprises the following steps: firstly, preparing MXene, growing a layer of zinc oxidefilm on the surface of the MXene, and then coating the surface of the zinc oxide film with a layer of zinc nitride as a functional interlayer coating material of the lithium-sulfur battery. Accordingto the method, the shuttle effect of polysulfide in the lithium-sulfur battery prepared in the prior art is effectively relieved, the utilization rate of active substances in the positive electrode material is increased, and the problem that the cycle performance of the lithium-sulfur battery is unstable is solved.

Description

technical field [0001] The invention relates to a preparation method for a functional interlayer of a lithium-sulfur battery, in particular to a method for preparing an MXene material first, growing a layer of zinc oxide film on its surface, and then coating a layer of zinc nitride on the surface, A method for use as a functional interlayer of a lithium-sulfur battery belongs to the field of materials chemistry. Background technique [0002] With the development of science and technology, portable electronic products, electric vehicles, and aerospace and military industries all expect battery systems with higher energy density and longer working life. However, the traditional lithium-ion battery is limited by its theoretical capacity and cannot meet the requirements of electric vehicles or hybrid vehicles for long-distance transportation. Therefore, exploring and developing electrochemical energy storage systems with high energy density and low cost is a very important meas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/431Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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