Preparation method of high-sulfur-content lithium-sulfur battery positive electrode material

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of difficulty in realizing industrial production, low actual charge-discharge specific capacity, and low active material loading rate, etc., and achieve improved adsorption effect, enhanced chemical adsorption, and improved physical and chemical properties

Active Publication Date: 2021-10-08
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

[0004] The object of the present invention is to provide a high-content sulfur-carbon nanotube composite material for the defects of low active material loading rate in the prior art; obvious volume expansion effect and low actual charge-discharge specific capacity, which makes it difficult to realize industrial production. A method for preparing a cathode material for a lithium-sulfur battery based on sulfur. The material prepared by the preparation method significantly improves the loading rate of the active material and effectively avoids the volume expansion effect of the lithium-sulfur battery.

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  • Preparation method of high-sulfur-content lithium-sulfur battery positive electrode material

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Embodiment 1

[0029] The preparation method of the high-sulfur lithium-sulfur battery cathode material comprises the following steps:

[0030] (1) Preparation of Ni(OH) 2 Precursor: First, 0.713g NiCl 2 ·6H 2 O and 1.802g urea were dissolved in 15mL deionized water respectively, and were configured to obtain nickel chloride solution and urea solution; the two solutions were mixed to form a light green solution, stirred for 30 minutes at a rotating speed of 300r / min; Under stirring, 6 mL of ammonia solution with a mass fraction of 13% was dropped dropwise into the light green solution to form a blue solution, namely Ni(OH) 2 Precursor;

[0031] (2) Preparation of Ni(OH) 2 @CNT: First, take 800 mg of carboxylated multi-walled carbon nanotube water slurry containing 10% carbon nanotubes and disperse it in 30 mL of absolute ethanol. The ethanol solution was uniformly dispersed into the blue solution obtained in step (1) to form a dispersion; then the dispersion was transferred to a 150mL p...

Embodiment 2

[0038] The preparation method of the high-sulfur lithium-sulfur battery cathode material comprises the following steps:

[0039] (1) Preparation of Ni(OH) 2 Precursor: First, 0.713g NiCl 2 ·6H 2 O and 1.802g urea were dissolved in 15mL deionized water respectively, and were configured to obtain nickel chloride solution and urea solution; the two solutions were mixed to form a light green solution, stirred for 30 minutes at a rotating speed of 300r / min; Under stirring, 6 mL of ammonia solution with a mass fraction of 13% was dropped dropwise into the light green solution to form a blue solution, namely Ni(OH) 2 Precursor;

[0040] (2) Preparation of Ni(OH) 2 @CNT: First, take 600 mg of carboxylated multi-walled carbon nanotube water slurry containing 10% carbon nanotubes and disperse it in 30 mL of absolute ethanol. The ethanol solution was uniformly dispersed into the blue solution obtained in step (1) to form a dispersion; then the dispersion was transferred to a 150mL p...

Embodiment 3

[0043] The preparation method of the high-sulfur lithium-sulfur battery cathode material comprises the following steps:

[0044] (1) Preparation of Ni(OH) 2 Precursor: First, 0.713g NiCl 2 ·6H 2 O and 1.802g urea were dissolved in 15mL deionized water respectively, and were configured to obtain nickel chloride solution and urea solution; the two solutions were mixed to form a light green solution, stirred for 30 minutes at a rotating speed of 300r / min; Under stirring, 6 mL of ammonia solution with a mass fraction of 13% was dropped dropwise into the light green solution to form a blue solution, namely Ni(OH) 2 Precursor;

[0045] (2) Preparation of Ni(OH) 2 @CNT: First, take 800 mg of carboxylated multi-walled carbon nanotube water slurry containing 10% carbon nanotubes and disperse it in 30 mL of absolute ethanol. The ethanol solution was uniformly dispersed into the blue solution obtained in step (1) to form a dispersion; then the dispersion was transferred to a 150mL p...

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Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a preparation method of a high-sulfur-content lithium-sulfur battery positive electrode material. The preparation method of the high-sulfur-content lithium-sulfur battery positive electrode material comprises the following steps of (1) preparing a Ni(OH)2 precursor, (2) preparing Ni(OH)2@CNT, and (3) preparing S/Ni(OH)2@CNT. According to the material prepared by the preparation method, the volume expansion effect of the lithium-sulfur battery is effectively avoided while the loading rate of the active substance is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a method for preparing a high-sulfur lithium-sulfur battery cathode material. Background technique [0002] With the advancement of social science and technology, people pay more and more attention to the protection of the environment while their demand for energy increases. At present, lithium-sulfur battery not only has extremely high energy density and theoretical capacity, but also its active material sulfur has the characteristics of cheap price, abundant reserves and no pollution to the environment. It has become one of the most promising low-cost energy storage systems. However, lithium-sulfur batteries still have the following problems that restrict their commercial development: (1) the active material sulfur and its product lithium sulfide are not conductive; (2) the volume expansion of the sulfur electrode destroys the electrode structure during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052
CPCH01M4/38H01M4/625H01M4/626H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 张永光金倩文
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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