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Preparation method of layered double hydroxide composite material for positive electrode of lithium-sulfur battery

A hydroxide, composite material technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problem of rare polar metal compounds

Active Publication Date: 2021-09-14
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

At present, the existing technology is devoted to dispersing metal single atoms in carbon materials to effectively improve its catalytic activity, but there are few studies on the combination of polar metal compounds and metal single atoms

Method used

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  • Preparation method of layered double hydroxide composite material for positive electrode of lithium-sulfur battery
  • Preparation method of layered double hydroxide composite material for positive electrode of lithium-sulfur battery

Examples

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Effect test

Embodiment 1

[0022] The layered dual hydroxide composite preparation method for the positive electrode of lithium sulfur batteries, including the following steps:

[0023] (1) Synthesis ac-feconi: First, 190.1 mgnicl 2 · 6h 2 O and 25.4mgfecl 2 Dissolved in 20 ml of methanol to give methanol solution A, spare; 50 mgZiF-67 ultrasonic dispersed in 10 ml of methanol to obtain methanol solution B; then pour methanol solution A in methanol solution B to give a mixed solution; finally mixed The solution was transferred to the autoclave at 120 ° C for 1 h, centrifugally, and washed with methanol to remove residual ions, and dried for 12 hours;

[0024] (2) Synthesis of Cu Sas / Ac-Feconi: 40 mgac-feconi (amorphous / crystalline FECONI LDH hollow nano box) obtained by step (1) is dispersed in a 20 ml of methanol / ammonium hydroxide mixture to obtain an Ac-Feconi solution. Among them, according to methanol in mass: ammonium hydroxide is 3: 1; 1.0 mgcucl 2 . Hide 2 O Dissolve in 5 ml of methanol to get...

Embodiment 2

[0026] The step (2) synthesis Cu Sas / Ac-FeConi will be Cucl under the continuous stirring conditions at room temperature 2 The methanol solution was added dropwise to the Ac-FeConi solution, and the mixture was obtained for 50 minutes at room temperature.

[0027] Others are the same as in Example 1.

Embodiment 3

[0029] The layered dual hydroxide composite preparation method for the positive electrode of lithium sulfur batteries, including the following steps:

[0030](1) Synthesis ac-feconi: First, 383MGNICL 2 · 6h 2 O and 50.9mgfecl 2 Dissolved in 40 ml of methanol to give a methanol solution A, spare; a mixture of 100 mgziF-67 is dispersed in 20 ml of methanol to obtain a methanol solution B; then pour the methanol solution A in methanol solution B to obtain a mixed solution; finally mixed The solution was transferred to the autoclave at 120 ° C for 1 h, centrifugally, and washed with methanol to remove residual ions, and dried for 12 hours;

[0031] (2) Synthesis of Cu Sas / Ac-Feconi: 80 mgac-feconi obtained by step (1) is dispersed in a 40 ml of methanol / ammonium hydroxide mixture to obtain an Ac-Feconi solution, wherein the mass ratio of methanol: ammonium hydroxide is 3: 1 ; 2.0mgcucl 2 . Hide 2 O Dissolve in 10 ml of methanol to get Cucl 2 Methanol solution; Cucl Cucl under cont...

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PUM

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a preparation method of a layered double hydroxide composite material for a positive electrode of a lithium-sulfur battery. The preparation method of the layered double hydroxide composite material for the positive electrode of the lithium-sulfur battery comprises the following steps: (1) synthesizing AC-FeCoNi; and (2) synthesizing Cu SAs / AC-FeCoNi. Copper atoms are introduced into AC-FeCoNi through an in-situ cation exchange reaction to prepare the Cu SAs / AC-FeCoNi composite material, and the preparation method is simple, effective and easy to operate; and the prepared composite material has high conductivity and high specific surface area, and has a stable three-dimensional structure.

Description

Technical field [0001] The present invention belongs to the technical field of lithium sulfur batteries, and in particular, a layered dual hydroxide composite preparation method for a positive electrode of a lithium sulfur battery. Background technique [0002] In recent years, with the rapid development of my country's industrial, vigorous development of lithium sulfur batteries (LSB) due to their lithium (3860mah.g) -1 ) And sulfur (1672mAh.g -1 The significant theoretical specific capacity is one of the most promising next-generation energy storage systems. Earth's rich sulfur has low cost and environmentally friendly advantages, but the practical application of LSB is still limited by the low sulfur utilization rate (<80%) and limited life (<500 cycles), mainly due to S / Li 2 The electrical conductivity difference between S and the shuttle effect. In addition, the transformation kinetics of the polysulfide (LiPSS) and the huge volume fluctuations accompanying, leading ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/052H01M4/62
CPCH01M4/364H01M4/366H01M4/58H01M10/052H01M4/628H01M2004/028Y02E60/10
Inventor 王新胡晨晨宋延丽韦小玲
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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