Preparation method of sodium ion battery negative electrode material of zinc-cobalt bimetal sulfide

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle life and stability, improve specific capacity and stability, increase capacity and service life, increase The effect of specific capacity

Active Publication Date: 2020-02-21
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

Studies have shown that ZnO and CoS 2 The sodium storage mechanism involves a conversion process, however, due to the large volume change of the battery during charging and discharging, spherical ZnS and CoS 2 Poor performance in terms of cycle life and stability performance

Method used

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  • Preparation method of sodium ion battery negative electrode material of zinc-cobalt bimetal sulfide
  • Preparation method of sodium ion battery negative electrode material of zinc-cobalt bimetal sulfide
  • Preparation method of sodium ion battery negative electrode material of zinc-cobalt bimetal sulfide

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Experimental program
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Effect test

Embodiment 1

[0032] The first step: the preparation of ZnO nanospheres:

[0033] Dissolve 0.88g of zinc acetate and 0.62g of triethanolamine in 40mL and 200mL of water, respectively, then magnetically stir for 15min, and then transfer ultrasound for 30min to obtain a milk-like suspension. Then the solution was left to stand for 12h. After standing still, samples were collected by centrifugation, washed three times with water and ethanol, and dried in an oven at 60° C. to obtain ZnO nanospheres.

[0034] Step 2: Synthesis of ZnO@Co-MOF material

[0035] Dissolve 0.04g of ZnO nanospheres prepared in step (1) in 10mL of ethanol, ultrasonically treat for 10min, then add 0.293g of cobalt nitrate hexahydrate to the solution, continue to sonicate for 10min, and mark it as A solution. Dissolve imidazole in 10mL ethanol, mark it as solution B, quickly pour solution B into solution A, keep stirring for 2 hours, collect samples by centrifugation, wash with methanol three times, and dry them in an o...

Embodiment 2

[0042] The first step: the preparation of ZnO nanospheres:

[0043] Zinc acetate and triethanolamine were dissolved in 40mL and 200mL of water, respectively, then magnetically stirred for 15min, and then transferred to ultrasound for 30min to obtain a milky suspension. Then the solution was left to stand for 12h. After standing still, samples were collected by centrifugation, washed three times with water and ethanol, and dried in an oven at 60° C. to obtain ZnO nanospheres.

[0044] Step 2: Synthesis of ZnO@Co-MOF material

[0045] Dissolve the ZnO nanospheres prepared in step (1) in ethanol, ultrasonically treat for 10min, then add cobalt nitrate hexahydrate to the solution, continue ultrasonication for 10min, mark it as A solution, dissolve dimethylimidazole in ethanol, Labeled as solution B, quickly pour solution B into solution A, keep stirring for 2 hours, separate by centrifuge, collect samples, wash with methanol three times, and dry in an oven at 60°C to obtain ZnO@...

Embodiment 3

[0049] The first step: the preparation of ZnO nanospheres:

[0050] Zinc acetate and triethanolamine were dissolved in 40mL and 200mL of water, respectively, then magnetically stirred for 15min, and then transferred to ultrasound for 30min to obtain a milky suspension. Then the solution was left to stand for 12h. After standing still, samples were collected by centrifugation, washed three times with water and ethanol, and dried in an oven at 60° C. to obtain ZnO nanospheres.

[0051] Step 2: Synthesis of ZnO@Co-MOF material

[0052] Dissolve the ZnO nanospheres prepared in step (1) in ethanol, ultrasonically treat for 10min, then add cobalt nitrate hexahydrate to the solution, continue ultrasonication for 10min, mark it as A solution, dissolve dimethylimidazole in ethanol, Labeled as solution B, quickly pour solution B into solution A, keep stirring for 2 hours, separate by centrifuge, collect samples, wash with methanol three times, and dry in an oven at 60°C to obtain ZnO@...

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Abstract

The invention belongs to the technical field of material chemistry, particularly discloses a preparation method of a sodium ion battery negative electrode material of zinc-cobalt bimetal sulfide, andsynthesizes a ZnS@CoS2@C heterostructure by a simple and convenient method so as to enhance electrochemical property of the sodium ion battery. The method comprises steps that ZnO precursor is synthesized; the ZnS@CoS2@C is obtained by growing a layer of Co-MOF structure on the surface through performing hydrothermal vulcanization and calcining in an Ar atmosphere, and the ZnS@CoS2@C has a uniformheterogeneous interface structure, so the ion diffusion kinetics is improved, electron conductivity is improved, and electrochemical performance of the sodium ion battery is further improved. Compared with pure ZnS, the ZnS@CoS2@C heterostructure is utilized as SIB of a negative electrode, so the specific capacity can be remarkably improved, and excellent cycling stability and rate performance are shown.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a preparation method of a zinc-cobalt bimetallic sulfide sodium ion battery negative electrode material. Background technique [0002] Rechargeable lithium-ion batteries are widely used in various fields due to their high energy density, environmental friendliness and long cycle life. For example: portable electronic products and electric vehicles and other products. However, due to the relatively expensive price of lithium metal, it is urgent to develop new energy storage systems to replace lithium-ion batteries. Metal sodium has a lot of storage on the earth, and the price is much cheaper than metal lithium, so it has been studied and explored by many researchers. Sodium-ion batteries are considered to be a new generation of energy storage systems to replace lithium-ion batteries. However, because the radius of sodium ions is larger than that of lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 董玉成林叶茂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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