Sodium-sulfur battery positive electrode material and preparation method thereof

A cathode material, sodium-sulfur battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor rate performance, short cycle life, low utilization rate, etc., achieve high porosity, solve volume expansion, The effect of improving utilization

Active Publication Date: 2021-01-08
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

[0004] The purpose of the present invention is to provide a sodium-sulfur battery positive electrode material and a preparation method thereof for the problems of low utilization rate of the positive electrode active material of the sodium-sulfur battery, poor rate performance, serious volume expansion during charging and discharging, and short cycle life. The positive electrode material is innovative By compounding Ni-ZIF67 with hollow structure and Mxene by said method, a kind of electrode material with good conductivity and high porosity is prepared, which can effectively improve the conductivity of the electrode material and inhibit the volume expansion of the electrode. , improve battery cycle and rate performance

Method used

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Embodiment 1

[0023] The preparation method of the positive electrode material of the sodium-sulfur battery comprises the following steps:

[0024] (1) Preparation of ZIF67 with a dodecahedral structure: Weigh 1.45g of cobalt nitrate and 1.64g of dimethylimidazole and dissolve them in 125mL of methanol respectively. After the two are completely dissolved, quickly pour the methanol solution of dimethylimidazole into into the methanol solution of cobalt nitrate, fully stirred for 20 minutes, and then stood still for 24 hours; then, after using methanol for centrifugation and washing 3 times, it was incubated at 60 ° C for 12 hours to obtain ZIF67 nanoparticles;

[0025] (2) Preparation of dodecahedral hollow shell material Ni-ZIF67 composed of layered double metal hydroxide: weigh 730mg of nickel nitrate and 300mg of ZIF67 obtained in step (1), dissolve nickel nitrate in 180mL of absolute ethanol, ZIF67 Dissolve in 20mL of absolute ethanol; heat the ethanol solution of nickel nitrate in a rou...

Embodiment 2

[0031] The preparation method of the positive electrode material of the sodium-sulfur battery comprises the following steps:

[0032] (1) Preparation of ZIF67 with a dodecahedral structure: Weigh 1.45g of cobalt nitrate and 1.64g of dimethylimidazole and dissolve them in 125mL of methanol respectively. After the two are completely dissolved, pour the methanol solution of dimethylimidazole into In the methanol solution of cobalt nitrate, fully stir for 20 minutes and then stand still for 24 hours; then use methanol to centrifuge and wash 3 times, and then incubate at 60 ° C for 12 hours to obtain ZIF67 nanoparticles;

[0033] (2) Preparation of dodecahedral hollow shell material Ni-ZIF67 composed of layered double metal hydroxide: weigh 730mg of nickel nitrate and 200mg of ZIF67 obtained in step (1), dissolve nickel nitrate in 180mL of absolute ethanol, ZIF67 Dissolve in 20mL absolute ethanol; heat the ethanol solution of nickel nitrate in a round bottom flask to 60°C, then pou...

Embodiment 3

[0037] The preparation method of the positive electrode material of the sodium-sulfur battery comprises the following steps:

[0038](1) Preparation of ZIF67 with a dodecahedral structure: Weigh 1.45g of cobalt nitrate and 1.64g of dimethylimidazole and dissolve them in 125mL of methanol respectively. After the two are completely dissolved, pour the methanol solution of dimethylimidazole into In the methanol solution of cobalt nitrate, fully stir for 20 minutes and then stand still for 24 hours; then use methanol to centrifuge and wash 3 times, and then incubate at 60 ° C for 12 hours to obtain ZIF67 nanoparticles;

[0039] (2) Preparation of dodecahedral hollow shell material Ni-ZIF67 composed of layered double metal hydroxide: weigh 730mg of nickel nitrate and 400mg of ZIF67 obtained in step (1), dissolve nickel nitrate in 180mL of absolute ethanol, ZIF67 Dissolve in 20mL absolute ethanol; heat the ethanol solution of nickel nitrate in a round bottom flask to 78°C, then pour...

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Abstract

The invention belongs to the technical field of sodium-sulfur batteries, and particularly relates to a sodium-sulfur battery positive electrode material and a preparation method thereof. The positiveelectrode material is a Ni-ZIF67@MXene / sulfur composite material. According to the positive electrode material, Ni-ZIF67 of a hollow structure and Mxene are creatively compounded through the method, the electrode material with high conductivity and high porosity is prepared, the conductivity of the electrode material can be effectively improved, the volume expansion of an electrode is inhibited, and the cycle and rate performance of a battery is improved.

Description

technical field [0001] The invention belongs to the technical field of sodium-sulfur batteries, and in particular relates to a sodium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Nowadays, problems such as environmental pollution, greenhouse effect, and energy crisis are becoming more and more serious in the world, and secondary batteries with high specific energy are of great significance for solving prominent energy and environmental problems. Lithium-ion secondary batteries have excellent properties such as high reversible capacity, high voltage, high cycle performance, and high energy density, and are currently the dominant power source for practical use. However, traditional cathode materials for lithium-ion batteries, such as lithium iron phosphate, have low theoretical specific capacity, which limits their further development. The sodium-sulfur battery generally uses elemental sulfur or sulfur-containing materials as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/39
CPCH01M4/362H01M4/38H01M4/624H01M4/628H01M10/3909H01M2004/021H01M2004/028Y02E60/10
Inventor 钊妍邱伟龙
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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