Tin selenide nanosheet array/carbon cloth composite negative electrode material structure for sodium ion battery

A sodium-ion battery and nanosheet array technology, which is applied to battery electrodes, structural parts, circuits, etc., can solve problems such as slowness, achieve the effects of avoiding agglomeration, simple negative electrode structure, and improving specific capacity and cycle stability

Pending Publication Date: 2022-06-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although SnSe has made some progress as a sodium storage anode material in recent years, the cycle problem caused by the volume change during the SnSe reaction process, as well as the slow kinetics problem caused by its semiconductor properties and the product Sn during the reaction process still need to be solved urgently.

Method used

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  • Tin selenide nanosheet array/carbon cloth composite negative electrode material structure for sodium ion battery
  • Tin selenide nanosheet array/carbon cloth composite negative electrode material structure for sodium ion battery
  • Tin selenide nanosheet array/carbon cloth composite negative electrode material structure for sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, cut the carbon cloth into a size of 0.9cm×0.9cm, then wash the carbon cloth with acetone, anhydrous ethanol and deionized water successively, put it in a drying oven to dry, take out the dried carbon cloth, and weigh it with a balance The mass of the carbon cloth was 8.21 mg, and then the vacuum thermal evaporation method was used in a vacuum degree of 5 × 10. -4 The tin selenide powder raw material was heated to 450 °C under Pa and kept for 90 min to prepare a tin selenide array nanosheet array on the carbon cloth. After taking out the sample, the weight was weighed again to 9.57 mg, and the weight of the carbon cloth was subtracted from this weight. Therefore, the mass of the active material was calculated to be 1.36 mg, and then the carbon cloth loaded with the tin selenide nanosheet array was used as the negative electrode of the sodium ion battery, and the positive electrode was the sodium sheet, which was assembled into a button battery for electrochemical p...

Embodiment 2

[0027] First, cut the carbon cloth into a size of 0.9cm×0.8cm, then wash the carbon cloth with acetone, anhydrous ethanol and deionized water successively, put it in a drying oven to dry, take out the dried carbon cloth, and weigh it with a balance The mass of the carbon cloth was 9.72 mg, and then the vacuum thermal evaporation method was used in a vacuum of 5 × 10 -5 The tin selenide powder raw material was heated to 450 °C under Pa and kept for 90 min to prepare a tin selenide array nanosheet array on the carbon cloth. After taking out the sample, the weight was weighed again to 10.97 mg, and the weight of the carbon cloth was subtracted from this weight. Therefore, the mass of the active material was calculated to be 1.25 mg, and then the carbon cloth loaded with the tin selenide nanosheet array was used as the negative electrode of the sodium ion battery, and the positive electrode was the sodium sheet, which was assembled into a button battery for electrochemical performa...

Embodiment 3

[0030] First cut the carbon cloth into a size of 0.8cm×0.8cm, then wash the carbon cloth with acetone, anhydrous ethanol and deionized water successively, put it in a drying box to dry, take out the dried carbon cloth, and weigh it with a balance The mass of the carbon cloth is 8.21mg, and the vacuum degree is 5×10 by the vacuum thermal evaporation method. -5 The tin selenide powder raw material was heated to 450 °C under Pa and kept for 90 mm, and the tin selenide array nanosheet array was prepared on the carbon cloth. After taking out the sample, the weight was weighed again to 9.91 mg, and the weight of the carbon cloth was subtracted from this weight. Therefore, the mass of the active material was calculated to be 1.70 mg, and then the carbon cloth loaded with the tin selenide nanosheet array was used as the negative electrode of the sodium ion battery, and the positive electrode was the sodium sheet, which was assembled into a button battery for electrochemical performance...

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Abstract

The invention provides a tin selenide nanosheet array / carbon cloth composite negative electrode material structure for a sodium ion battery, and belongs to the technical field of nano materials and batteries. The negative electrode material structure is prepared by adopting a simple vacuum thermal evaporation technology, and tin selenide powder is heated to a certain temperature in a vacuum environment to sublimate and deposit on carbon cloth to form a tin selenide nanosheet array, so that the composite negative electrode material structure is formed. The tin selenide nanosheet array uniformly covers the surface of the carbon cloth, so that each nanosheet can contribute effective capacity, the agglomeration phenomenon of a powder material can be effectively avoided, and the specific capacity and the cycling stability of the material are improved. And the composite negative electrode structure has the flexibility of the carbon cloth, and the conductivity of the composite negative electrode structure is improved by the carbon cloth. Compared with a traditional battery negative electrode material, the structure does not need to use a binder and a conductive agent, can be directly used as a sodium ion battery negative electrode, has high specific capacity and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and batteries, relates to a negative electrode material structure of a sodium ion battery, and in particular relates to a negative electrode material structure of a tin selenide nanosheet array / carbon cloth composite sodium ion battery. Background technique [0002] In recent years, sodium-ion batteries are considered to be the most promising alternative to lithium-ion batteries because of their abundant raw material reserves and low cost, and because sodium and lithium are the same main group element and have similar physical and chemical properties. [0003] SnSe as a group IV metal sulfide has a high theoretical specific capacity of sodium-ion batteries (780mAh g -1 ), and the high abundance of natural elements on earth is environmentally friendly and has the potential to realize high-performance sodium-ion battery anode materials. Lee et al. prepared SnSe / C composites by ball milling an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/625H01M4/58Y02E60/10
Inventor 简基康杨文龙
Owner GUANGDONG UNIV OF TECH
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