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A kind of preparation method of the sodium ion battery anode material of double metal selenide

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electronic conductivity, poor ion diffusion kinetics, and structural collapse

Active Publication Date: 2020-10-20
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

Although metal selenides have many advantages as anodes for Na-ion batteries, there are still some serious problems that need to be addressed, such as severe structural collapse during charge and discharge, poor electronic conductivity and ion diffusion kinetics.

Method used

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  • A kind of preparation method of the sodium ion battery anode material of double metal selenide
  • A kind of preparation method of the sodium ion battery anode material of double metal selenide
  • A kind of preparation method of the sodium ion battery anode material of double metal selenide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step is to prepare the precursor of CuCo-MOF

[0029] 1.328g of potassium cobaltcyanide was dissolved in 50mL of ultrapure water and marked as solution A, 0.78g of cuprous chloride and 1.94g of sodium citrate were dissolved in 50mL of ultrapure water and marked as solution B, Finally, solution A and solution B were mixed and allowed to stand for 24 hours. After the reaction was over, the precipitated product was collected. The product was rinsed three times with deionized water, and then dried in an oven at 60°C.

[0030] The second step is to prepare Cu 2 Se / CoSe 2 @C anode material

[0031] The obtained CuCo-MOF precursor and selenium powder were put into a porcelain boat, the ratio was 1:3, and then calcined under the protection of inert gas, the reaction temperature was 400°C, and the reaction time was 3h. When cooled to room temperature, Cu 2 Se / CoSe 2 @C compound.

[0032] as attached figure 1 As shown, the prepared CuCo-MOF precursor has a cubi...

Embodiment 2

[0037] The first step is to prepare the precursor of CuCo-MOF

[0038] 1.328g of potassium cobaltcyanide was dissolved in 50mL of ultrapure water and marked as solution A, 0.78g of cuprous chloride and 1.94g of sodium citrate were dissolved in 50mL of ultrapure water and marked as solution B, Finally, solution A and solution B were mixed and allowed to stand for 24 hours. After the reaction was over, the precipitated product was collected. The product was rinsed three times with deionized water, and then dried in an oven at 60°C.

[0039] The second step is to prepare Cu 2 Se / CoSe 2 @C anode material

[0040] The obtained CuCo-MOF precursor and selenium powder were put into a porcelain boat at a ratio of 1:2, and then calcined under the protection of an inert gas, the reaction temperature was 400°C, and the reaction time was 3h. When cooled to room temperature, Cu 2 Se / CoSe2 @C compound.

Embodiment 3

[0042] The first step is to prepare the precursor of CuCo-MOF

[0043] 1.328g of potassium cobaltcyanide was dissolved in 50mL of ultrapure water and marked as solution A, 0.78g of cuprous chloride and 1.94g of sodium citrate were dissolved in 50mL of ultrapure water and marked as solution B, Finally, solution A and solution B were mixed and allowed to stand for 24 hours. After the reaction was over, the precipitated product was collected. The product was rinsed three times with deionized water, and then dried in an oven at 60°C.

[0044] The second step is to prepare Cu 2 Se / CoSe 2 @C anode material

[0045] The obtained CuCo-MOF precursor and selenium powder were put into a porcelain boat with a ratio of 1:3, and then calcined under the protection of an inert gas, the reaction temperature was 500°C, and the reaction time was 3h. When cooled to room temperature, Cu 2 Se / CoSe 2 @C compound.

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Abstract

The invention relates to a preparation method of a double metal selenide sodium ion battery negative electrode material, comprising synthesizing a metal organic framework CuCo-MOF, using CuCo-MOF as a precursor, and preparing a double metal selenium through a high-temperature selenization process under an inert atmosphere Compound Cu 2 Se / CoSe 2 @C. The prepared double metal selenide is used as the negative electrode material of the sodium ion battery, and the controllable synthesized structure can effectively improve the cycle performance and coulombic efficiency of the sodium ion battery. The technical solution of the invention overcomes the volume expansion of the negative electrode material of the sodium ion battery prepared in the prior art during the charging and discharging process, and effectively improves the cycle performance of the battery.

Description

technical field [0001] The technical solution of the invention relates to a preparation method of a double metal selenide sodium ion battery negative electrode material, which belongs to the field of material chemistry. Background technique [0002] In order to solve the problem of limited fossil fuel resources and the pursuit of more environmentally friendly energy storage devices, researchers have been working on finding battery materials with high energy density and long life. Although lithium-ion batteries have achieved great commercial success, their long-term and widespread application in portable electronic devices has been hindered by the severe shortage and high cost of lithium sources. Due to the cheap and abundant sodium resources, as well as the similar chemical properties to lithium, sodium-ion batteries (SIBs) are considered as the next-generation batteries that can replace lithium-ion batteries and have attracted extensive attention. At present, the developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCY02E60/10
Inventor 董玉成林叶茂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV