Preparation method of positive electrode material of sodium-sulfur battery

A cathode material, sodium-sulfur battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of volume expansion, hinder battery performance, poor sulfur conductivity, etc., and achieve the effect of enhancing conductivity

Active Publication Date: 2021-07-16
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

However, sodium-sulfur batteries still face many problems, such as poor conductivity of sulfur, volume expansion during discharge, and dissolution and shuttling of intermediate sodium polysulfide, which seriously hinder the performance and practical application of batteries.

Method used

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  • Preparation method of positive electrode material of sodium-sulfur battery
  • Preparation method of positive electrode material of sodium-sulfur battery

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Effect test

Embodiment 1

[0018] The preparation method of the positive electrode material of the sodium-sulfur battery comprises the following steps:

[0019] (1) Pretreatment of CNTs: Add 3 g of carbon nanotubes to 90 mL of HNO with a mass fraction of 65% 3 The solution was refluxed at 120°C for 5 hours, then washed with deionized water, dried at 60°C, and set aside;

[0020] (2) Preparation of CNTs@NiFe-LDH / C: First, Ni(NO 3 ) 2 ﹒ 6H 2 O and Fe(NO 3 ) 3 ﹒ 9H 2 O was dissolved in 5mL N,N-dimethylformamide, and then 10mg of CNTs was added to prepare solution A; then 0.5mmol 2-mercapto-5-nitrobenzimidazole was dissolved in 25mL N,N-dimethylformamide, Prepare liquid B; finally add liquid A dropwise to liquid B under stirring conditions to obtain a mixed solution, transfer the mixed solution to a 50mL stainless steel Teflon-lined autoclave, and heat at 160°C for 12 hours; wait for Naturally cooled to room temperature, the product was washed to obtain CNTs@NiFe-LDH / C; LDH was flower-shaped and as...

Embodiment 2

[0025] The preparation method of the positive electrode material of the sodium-sulfur battery comprises the following steps:

[0026] (1) Pretreatment of CNTs: Add 3 g of carbon nanotubes to 90 mL of HNO with a mass fraction of 65% 3 The solution was refluxed at 120°C for 5 hours, then washed with deionized water, dried at 60°C, and set aside;

[0027] (2) Preparation of CNTs@NiFe-LDH / C: First, Ni(NO 3 ) 2 ﹒ 6H 2 O and Fe(NO 3 ) 3 ﹒ 9H 2 O was dissolved in 5mL N,N-dimethylformamide, and then 10mg of CNTs was added to prepare solution A; then 0.5mmol 2-mercapto-5-nitrobenzimidazole was dissolved in 25mL N,N-dimethylformamide, Prepare B liquid; finally add A liquid to B liquid under the condition of stirring to obtain the mixed solution, transfer the mixed solution to a 50ml stainless steel Teflon-lined autoclave, and heat at 160°C for 12 hours; after the reaction, wait for Naturally cooled to room temperature, the product was washed to obtain CNTs@NiFe-LDH / C; LDH was f...

Embodiment 3

[0030] The preparation method of the positive electrode material of the sodium-sulfur battery comprises the following steps:

[0031] (1) Pretreatment of CNTs: Add 3 g of carbon nanotubes to 90 mL of HNO with a mass fraction of 65% 3 The solution was refluxed at 120°C for 5 hours, then washed with deionized water, dried at 60°C, and set aside;

[0032] (2) Preparation of CNTs@NiFe-LDH / C: First, Ni(NO 3 ) 2﹒ 6H 2 O and Fe(NO 3 ) 3 ﹒ 9H 2 O was dissolved in 5mL N,N-dimethylformamide, and then 10mg of CNTs was added to prepare solution A; then 0.5mmol 2-mercapto-5-nitrobenzimidazole was dissolved in 25mL N,N-dimethylformamide, Prepare liquid B; finally, add liquid A dropwise to liquid B under stirring conditions to obtain a mixed solution, transfer the mixed solution to an autoclave, and heat at 160°C for 12 hours; after the reaction is completed, cool to room temperature naturally, and The product was washed to obtain CNTs@NiFe-LDH / C; LDH was flower-shaped and assembled...

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Abstract

The invention belongs to the technical field of sodium-sulfur batteries, and relates to a preparation method of a positive electrode material of a sodium-sulfur battery. The preparation method comprises the following steps of: (1) pretreating CNTs; (2) preparing CNTs@NiFe-LDH/C; and (3) preparing S@CNTs@NiFe-LDH/C composite material. According to the method, a graded nanostructure of superfine amorphous ferronickel layered double hydroxide andnanocarbon grafted on a carbon nanotube skeleton is constructed through in-situ growth; and with the obtained composite material adopted, the shuttling problem of sodium polysulfide can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of sodium-sulfur batteries, and in particular relates to a preparation method of anode materials for sodium-sulfur batteries. Background technique [0002] With the continuous growth of the scale of the global power industry and the rapid development of renewable energy (such as wind energy and solar energy) technologies, the need for large-scale energy storage to realize the integration of renewable energy into the grid and improve the efficiency and quality of power use is becoming more and more urgent. As a fast-growing energy storage battery, sodium-sulfur battery has a wide range of applications in the fields of peak shaving and valley filling, new energy grid connection, and smart grid construction. The theoretical specific energy of the sodium-sulfur battery is as high as 760Wh / kg, and it has the advantages of high energy density, long cycle life (up to 4500 times), no self-discharge phenomenon, 100% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/054
CPCH01M4/38H01M4/625H01M4/626H01M10/054H01M2004/028Y02E60/10
Inventor 张永光马恒韦小玲
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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