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Preparation and Application of Electrode Containing Tin Array Structure

An array structure and electrode technology, applied in the field of electrode preparation and application, can solve the problems of low negative electrode capacity, poor cycle stability, etc., and achieve the effect of improving electrical contact, improving cycle stability, and simple process

Active Publication Date: 2021-07-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low capacity and poor cycle stability of the negative electrode obtained by the existing method, the purpose of the present invention is to provide a preparation and application of an electrode containing tin array structure. The present invention adopts constant current electrodeposition technology on copper substrate The tin nanoscale tin array structure is directly grown on the surface, and the copper-tin alloyed enhanced electrode is obtained after annealing treatment. The electrode prepared by the present invention has high specific capacity, good cycle stability and excellent rate charge and discharge characteristics.

Method used

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  • Preparation and Application of Electrode Containing Tin Array Structure
  • Preparation and Application of Electrode Containing Tin Array Structure
  • Preparation and Application of Electrode Containing Tin Array Structure

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Take a 2cm×0.5cm copper sheet and ultrasonically clean it in oxalic acid solution, deionized water and alcohol for 10 minutes. With the cleaned copper sheet as the working electrode and the carbon electrode as the counter electrode, the electrolyte is composed of 0.06M tin tetrachloride pentahydrate and 0.12M trisodium citrate solution, and the electrolyte solvent is ethylene glycol and water (volume The ratio is 1:1), using a three-electrode system at 0.01A cm -2 Electrodeposition was performed for 20 minutes at a current density to deposit a tin array structure on the surface of the copper substrate. The copper substrate deposited with the tin array structure was annealed, the protective atmosphere used was argon, the temperature was 180° C., and the time was 2 hours to obtain a negative electrode with a tin array structure with a height of about 3 μm.

[0044] The negative electrode containing tin array structure (hereinafter referred to as tin array negative electr...

Embodiment 2

[0046] Take a 2cm×0.5cm copper sheet and ultrasonically clean it in oxalic acid solution, deionized water and alcohol for 10 minutes. With the cleaned copper sheet as the working electrode and the carbon electrode as the counter electrode, the electrolyte is composed of 0.2M tin tetrachloride pentahydrate and 0.2M polyvinylpyrrolidone solution, and the electrolyte solvent is ethylene glycol and water (volume ratio 1:1), using a three-electrode system at 0.01A cm -2 Depositing at a current density of 5 min to deposit a tin array structure on the surface of the copper substrate. The copper substrate deposited with the tin array structure was annealed at 220° C. for 2 hours under the protection of argon to obtain a tin array negative electrode with a height of about 5 μm.

[0047] The tin array negative electrode was tested for sodium storage performance according to the above method, and the results showed that the reversible sodium storage capacity of the obtained tin array ne...

Embodiment 3

[0049] Take a 2cm×1cm copper sheet and ultrasonically clean it in oxalic acid solution, deionized water and alcohol for 10 minutes. The cleaned copper sheet is used as the working electrode, and the carbon electrode is used as the counter electrode. The electrolyte is composed of 0.1M tin tetrachloride pentahydrate, 0.1M stannous chloride and 0.4M ethylenediamine hydrochloride. The electrolyte solvent is Diethylene glycol and water (volume ratio 1:2), using a three-electrode system at 0.04A cm -2 Electrodeposition was carried out for 10 minutes at a current density to deposit a tin array structure on the surface of the copper substrate. Then vacuum annealing was performed on the copper substrate deposited with the tin array structure, the annealing temperature was 200° C., and the time was 30 min to obtain a tin array negative electrode with a height of about 10 μm.

[0050] The tin array negative electrode was tested for sodium storage performance according to the above meth...

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Abstract

The invention relates to a method for preparing an electrode with a high-performance tin-containing array structure for a sodium ion battery, comprising the following steps: using a cleaned copper substrate as a working electrode, using a solution containing tin ions and a template as an electrolyte, A three-electrode system is used for constant current electrodeposition to form a tin array structure on the surface of the copper substrate; the substrate after the above treatment is annealed at 80-230°C in a vacuum or in a non-oxidizing gas to obtain a tin-containing array structure. electrode. The preparation method has simple process and convenient operation, and the prepared electrode can be directly used as a negative electrode of a sodium ion battery, and exhibits high specific capacity, good cycle stability and excellent rate charge and discharge characteristics.

Description

technical field [0001] The invention relates to the technical field of electrode preparation, in particular to the preparation and application of an electrode with a tin-containing array structure. Background technique [0002] In recent years, the rapid development of lithium-ion batteries in the field of large-scale energy storage and vehicle power has accelerated the consumption of lithium resources in the world, which has brought about the possible depletion of lithium resources. In addition, the recovery and reuse of lithium resources is still a worldwide technical problem. Therefore, finding new alternative energy storage battery systems is an urgent problem to be solved. Sodium-ion batteries are a potential choice because of their abundant resources, low cost, and higher safety. Despite the many potential performance and cost advantages of Na-ion batteries, their practical use in energy storage devices still faces many problems. One of the important problems is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/04H01M4/134H01M10/054B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/0452H01M4/0471H01M4/134H01M4/1395H01M10/054Y02E60/10
Inventor 倪江锋朱晓翠孙梦雷李亮
Owner SUZHOU UNIV
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