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Preparation method of high-specific-capacity sodium-sulfur battery positive electrode material

A sodium-sulfur battery and positive electrode material technology, which is applied in battery electrodes, positive electrodes, active material electrodes, etc., can solve the problems of battery chemical instability, large volume change, anode passivation, and low Coulombic efficiency.

Pending 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

However, there are still the following problems that seriously restrict the development of sodium-sulfur batteries: intermediate polysulfides (Na 2 S n ,4<n<8) are easily dissolved in the electrolyte and migrate freely between the anode and cathode regions, this “shuttle effect” leads to irreversible sulfur consumption, anode passivation, and Coulombic inefficiency, which in turn leads to battery chemistry unstable and inefficient
In addition, the conductivity of sulfur is poor (the conductivity at room temperature is only 5×10 -30 S m -1 ), the large volume change (170%) of the active material during cycling will induce severe electrochemical polarization and greatly limit the utilization of sulfur
[0004] Studies have shown that the shuttling problem of polysulfides in sodium-sulfur batteries is the root cause of the poor cycle performance of sodium-sulfur batteries. For the commercial development of sodium-sulfur batteries, it is urgent to solve the above problems

Method used

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  • Preparation method of high-specific-capacity sodium-sulfur battery positive electrode material
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  • Preparation method of high-specific-capacity sodium-sulfur battery positive electrode material

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Embodiment 1

[0026] The method of preparing the sodium-sulfur battery capacity than the positive electrode material, comprising the steps of:

[0027] (1) Preparation of ZIF-67: First, 1.64g dimethyl imidazole and 1.45g of cobalt nitrate hexahydrate were dissolved in 125mL methanol solution to prepare a solution of dimethyl imidazole and cobalt nitrate solution; then the solution dimethylimidazole was added to the stirred cobalt nitrate solution for 30 minutes for 24 hours, the precipitate was collected by centrifugation, and washed three times with ethanol, and dried at 70 deg.] C 24h, to give ZIF-67;

[0028] (2) Preparation of ZIF-67 @ rGO: Weigh step (1) prepared ZIF-67100mg was added to 100mL aqueous graphene oxide, the graphene oxide solution wherein the concentration of 2mg. mL -1 Ultrasonic stirring for 1 hour 24 hours to obtain a spray solution; spray solution was spray dried at 200 ℃, prepared ZIF-67 @ rGO;

[0029] (3) Preparation of a sulfur / ZIF-67 @ rGO: pure sulfur powder in st...

Embodiment 2

[0035] The method of preparing the sodium-sulfur battery capacity than the positive electrode material, comprising the steps of:

[0036] (1) Preparation of ZIF-67: First, 2.05g dimethyl imidazole and 1.81g of cobalt nitrate hexahydrate were dissolved in 175mL methanol solution to prepare a solution of dimethyl imidazole and cobalt nitrate solution; then the solution dimethylimidazole was added to the stirred cobalt nitrate solution for 30 minutes for 24 hours, the precipitate was collected by centrifugation, and washed three times with ethanol, and dried at 70 deg.] C 24h, to give ZIF-67;

[0037] (2) Preparation ZIF-67 @ RGO: ZiF-67150 mg prepared by step (1) was added to 100 ml of the grapien oxide inkyl, wherein the concentration of the oxide in graphene has a concentration of 2 mg. ml -1 After the ultrasonic treatment was 1.5 hours, stirred for 24 hours, resulting in a spray solution; spray drying treatment at 200 ° C, producing ZIF-67 @ RGO;

[0038] (3) Preparation of sulfur ...

Embodiment 3

[0040] The preparation method of the high-specific capacity sodium battery positive material, including the following steps:

[0041] (1) Preparation ZIF-67: First, 2.46 g of dimethylimidazole and 2.18 g of hexaviric acid cobalt were dissolved in 200 mL of methanol solution, and the dimethylimidazole solution and cobalt-nitrate solution were obtained; then the dimethylimidazole solution After stirring to a cobalt nitrate solution for 30 minutes, it was allowed to stand for 24 hours, and the precipitate was collected from centrifugation, and the use of ethanol was washed three times, and 24 h was dried at 70 ° C to obtain ZIF-67;

[0042] (2) Preparation ZIF-67 @ RGO: The ZIF-67200 mg prepared by step (1) was added to 100 ml of the oxide in grapiene aqueous solution, wherein the concentration of the oxide in graphene has a concentration of 2 mg. ml -1 After 2 hours, the ultrasonic treatment was stirred for 24 hours to obtain a spray solution; the spray solution was spray drying at ...

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Abstract

The invention belongs to the technical field of sodium-sulfur batteries, and particularly relates to a preparation method of a high-specific-capacity sodium-sulfur battery positive electrode material. The preparation method of the high-specific-capacity sodium-sulfur battery positive electrode material comprises the following steps: (1) preparing ZIF-67; (2) preparing ZIF-67@rGO; and (3) preparing sulfur / ZIF-67@rGO. The method is simple in process, the prepared ZIF-67@rGO can load more active substances, conversion of sodium polysulfide is accelerated, and therefore the electrochemical performance of the sodium-sulfur battery is improved.

Description

Technical field [0001] The present invention belongs to the technical field of the sodium-sulfur battery, the specific method for making a high specific capacity of the sodium-sulfur battery positive electrode material. Background technique [0002] Efficient large-scale electrical energy storage system in the world today attracted wide attention, we have been developed a variety of promising energy storage device, comprising a metal ion battery, a metal oxide and a metal-sulfur battery cell. After decades of research and development, conventional ion battery cathode materials (such as LiMn 2 O 4 , LiCoO 2 , LiNiO 2 , LiFePO 4 Etc.) has been widely used in mobile phones, notebook computers, digital cameras, and hybrid vehicles. However, with the increasing demand for energy storage devices with high energy density, such as submersible, unmanned aircraft and grid-scale storage of fixed, limited-ion batteries because of its theoretical energy density and can not meet the high energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/05
CPCH01M4/38H01M4/625H01M10/05H01M2004/028Y02E60/10
Inventor 张永光刘彦妤高万秸韦小玲
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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