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

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Problems solved by technology

At present, the existing technology is devoted to dispersing metal single atoms in carbon materials to effectively i...

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

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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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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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