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A modified three-dimensional porous antimony electrode, preparation method and application

A three-dimensional porous, antimony electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of capacity decay, poor electrode/electrolyte interface stability, large volume expansion of antimony electrodes, etc., to reduce side reactions and achieve good coverage , the effect of increasing the first Coulomb efficiency and cycle stability

Active Publication Date: 2020-11-10
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large volume expansion of antimony electrodes during the alloying process leads to powdering of the electrode material and poor stability of the electrode / electrolyte interface, which eventually leads to capacity fading.

Method used

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  • A modified three-dimensional porous antimony electrode, preparation method and application
  • A modified three-dimensional porous antimony electrode, preparation method and application
  • A modified three-dimensional porous antimony electrode, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of a three-dimensional porous antimony electrode;

[0038] Using three-dimensional porous copper as the current collector, the electrodeposition method is used to deposit antimony on the surface of the current collector, and the deposition amount is 0.5-1.8mg cm -2 , the preparation method of the three-dimensional porous copper is chemical growth.

[0039] In the preparation of the three-dimensional porous antimony electrode in step 1, the electrodeposition solution used in the potentiostatic deposition method contains a concentration of 0.2mol L -1 Sb 2 o 3 , the concentration is 0.2mol L -1 Tartaric acid, the concentration is 0.5mol L -1 Potassium hydroxide, the electrodeposition current density is 15mA cm -2 .

[0040] Step 2: Preparation of a three-dimensional porous antimony electrode with metal indium deposited on the surface;

[0041] The three-dimensional porous antimony electrode prepared in step one is used as the cathode, the platin...

Embodiment 2

[0046] The steps of this embodiment are the same as in Example 1, except that the oxidation treatment time in step 3 is 10min;

Embodiment 3

[0048] The steps of this embodiment are the same as in Example 1, except that the oxidation treatment time in step 3 is 5min;

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Abstract

The invention provides a modified three-dimensional porous antimony electrode, a preparation method and application. Three-dimensional porous copper is taken as a current collector, antimony is deposited on the surface of the current collector by using an electrodeposition method, the deposit rate is 0.5 to 1.8 mg cm<-2>, a three-dimensional porous antimony electrode is prepared, then the three-dimensional porous antimony electrode is taken as a negative electrode, a platinum plating titanium mesh is taken as a positive electrode, a three-dimensional porous antimony electrode of which the surface is deposited with metal indium is obtained through constant potential deposition, and finally the three-dimensional porous antimony electrode of which the surface is deposited with metal indium isput in a potassium dichromate solution for oxidation treatment, so that the modified three-dimensional porous antimony electrode is obtained. According to the modified three-dimensional porous antimony electrode provided by the invention, an indium oxide coating layer is adopted, the occurrence of an electrode / electrode interface side reaction is reduced, and the initial coulomb efficiency and cycling stability of the antimony electrode as a negative electrode of a sodium-ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of anode materials for sodium ion batteries and the technical field of electrodeposition, and specifically relates to a modified three-dimensional porous antimony electrode, a preparation method and an application. Background technique [0002] Due to the advantages of high energy density, long cycle life and environmental friendliness, lithium-ion batteries are widely used in the field of portable electronic devices, and are gradually expanding to the field of electric vehicles. However, the disadvantages of limited lithium reserves and high cost seriously hinder its application in the field of large-scale energy storage. Na-ion batteries have attracted extensive attention from researchers due to their electrochemical energy storage mechanism similar to that of lithium-ion batteries, abundant sodium resources, and low raw material costs. [0003] Among many anode materials for sodium-ion batteries, graphit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/134H01M4/1395H01M4/366H01M4/38H01M4/624H01M4/628H01M10/054Y02E60/10
Inventor 樊小勇蒋震韩家兴孙瑞波毋妍李东林苟蕾
Owner CHANGAN UNIV