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A kind of negative electrode material of sodium ion battery and preparation method thereof

A sodium ion battery and negative electrode material technology, applied in the field of material chemistry, can solve the problems of sodium ion battery negative electrode material volume expansion, easy damage of zinc oxide electrode material, poor cycle stability, etc.

Active Publication Date: 2020-12-25
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, when pure zinc oxide is used as the negative electrode material of the sodium ion battery, the sodium ion is repeatedly intercalated and extracted during the repeated charge and discharge process of the sodium ion battery, which will cause huge volume expansion and contraction of the negative electrode material of the sodium ion battery. ZnO electrode material is easily damaged, so pure ZnO usually shows poor cycle stability when used as anode material for Na-ion batteries

Method used

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  • A kind of negative electrode material of sodium ion battery and preparation method thereof
  • A kind of negative electrode material of sodium ion battery and preparation method thereof

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Embodiment 1

[0027] (1) Preparation of reduced graphene oxide fibers:

[0028] Take a commercially available graphene oxide aqueous solution (concentration: 0.5mg / mL), ultrasonicate for 40min, add sodium hydroxide to the uniformly dispersed graphene oxide aqueous solution, the solid-liquid ratio of sodium hydroxide and graphene oxide aqueous solution is 3:100g / mL mL, stirred and reacted at 70°C for 4h, followed by suction filtration to dry the solid powder. The prepared solid powder was placed in N,N-dimethylformamide at a solid-to-liquid ratio of 0.5:100 g / mL to prepare a spinning stock solution, and then the graphene oxide fiber was prepared by wet spinning. Place the prepared graphene oxide fiber in a reaction vessel, add hydrazine hydrate dropwise to it, the amount of hydrazine hydrate is added dropwise with reference to the ratio of 0.3g graphene oxide fiber: 0.1mL hydrazine hydrate, and place it in a constant temperature furnace , heat preservation at 100°C for 8 hours to obtain red...

Embodiment 2

[0034] (1) Preparation of reduced graphene oxide fibers:

[0035] Take commercially available graphene oxide aqueous solution (concentration is 0.1mg / mL), ultrasonic 30min, add sodium hydroxide to the uniformly dispersed graphene oxide aqueous solution, the solid-liquid ratio of sodium hydroxide and graphene oxide aqueous solution is 2:100g / mL mL, stirred and reacted at 60°C for 3h, followed by suction filtration to dry the solid powder. The prepared solid powder was placed in N,N-dimethylformamide at a solid-to-liquid ratio of 0.1:100 g / mL to prepare a spinning stock solution, and then the graphene oxide fiber was prepared by wet spinning. Place the prepared graphene oxide fiber in a reaction vessel, add hydrazine hydrate dropwise, the amount of hydrazine hydrate is added dropwise with reference to the ratio of 0.1g graphene oxide fiber: 0.1mL hydrazine hydrate, and place it in a constant temperature furnace , 90 ° C for 6 h to react to obtain reduced graphene oxide fibers. ...

Embodiment 3

[0041] (1) Preparation of reduced graphene oxide fibers:

[0042] Take a commercially available graphene oxide aqueous solution (concentration: 2mg / mL), ultrasonicate for 60min, add sodium hydroxide to the uniformly dispersed graphene oxide aqueous solution, the solid-liquid ratio of sodium hydroxide to graphene oxide aqueous solution is 5:100g / mL , Stir the reaction at 80° C. for 5 h, and then perform suction filtration to dry the solid powder. The prepared solid powder was placed in N,N-dimethylformamide at a solid-to-liquid ratio of 2:100 g / mL to prepare a spinning stock solution, and then the graphene oxide fiber was prepared by wet spinning. Place the prepared graphene oxide fiber in a reaction vessel, add hydrazine hydrate dropwise, the amount of hydrazine hydrate is added dropwise with reference to the ratio of 0.5g graphene oxide fiber: 0.1mL hydrazine hydrate, and place it in a constant temperature furnace , 120 ° C for 12 h to react to obtain reduced graphene oxide ...

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Abstract

The invention relates to a negative electrode material of a sodium ion battery and a preparation method thereof. The negative electrode material is a ZIF8 / zinc oxide / reduced graphene oxide ternary composite material, and its preparation process includes, using electrospinning to prepare graphene oxide fibers, and preparing reduced graphene oxide fibers through reduction with a strong reducing agent, and then Zinc oxide and reduced graphene oxide fibers were combined by hydrothermal method to obtain zinc oxide / reduced graphene oxide composites, and then ZIF8 / zinc oxide / reduced graphene oxide ternary composites were prepared by zinc oxide induction. The introduction of graphene makes up for the lack of electron and sodium ion transport efficiency of the zinc oxide electrode, and the high specific area of ​​ZIF8 improves the structural stability and ion adsorption capacity of the material. Reduced graphene oxide fibers, zinc oxide, and ZIF8 work together to improve the electrochemical performance of sodium-ion batteries.

Description

technical field [0001] The invention relates to a high specific capacity sodium ion battery negative electrode material and a preparation method thereof, belonging to the field of material chemistry. Background technique [0002] Since the successful commercialization of lithium-ion batteries in 1991, there has been great success in portable energy storage. However, the scarcity of lithium resources has led to a continuous increase in the cost of lithium-ion batteries. Sodium-ion batteries have a charging and discharging mechanism similar to lithium-ion batteries, and sodium resources are far more abundant than lithium, so sodium-ion batteries are ideal substitutes for lithium-ion batteries. However, commercial graphite anodes for lithium-ion batteries are not suitable for sodium-ion batteries. Therefore, the research on anode materials for Na-ion batteries is of great significance to the development of Na-ion batteries. [0003] As a typical metal oxide, ZnO has the adva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/054
CPCH01M4/36H01M4/362H01M4/483H01M4/583H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 钊妍王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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