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Preparation method of cobalt-iron bimetal selenide sodium ion battery negative electrode material

A sodium ion battery and negative electrode material technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve problems such as poor cycle life and stable performance, improve cycle performance, increase capacity and service life, and increase specific capacity Effect

Active Publication Date: 2020-03-31
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

However, due to the large volume change of the battery during charging and discharging, bulk FeSe 2 and CoSe 2 Exhibit poor cycle life and stability performance

Method used

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  • Preparation method of cobalt-iron bimetal selenide sodium ion battery negative electrode material
  • Preparation method of cobalt-iron bimetal selenide sodium ion battery negative electrode material
  • Preparation method of cobalt-iron bimetal selenide sodium ion battery negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step: the preparation of ZIF-67 precursor:

[0028] Dissolve 0.291g of sodium cobaltate nitrate in 20mL of methanol and then stir in a magnetic stirrer at a speed of 400r / min for 5min until completely dissolved, which is marked as solution A. Dissolve 0.658g of 2-methylimidazole in 20 mL of methanol, stir for 5min at a speed of 400r / min in a magnetic stirrer until completely dissolved, and mark it as B solution. Quickly pour solution B into solution A and stir for 5 minutes, let stand at room temperature for 24 hours, collect samples by centrifugation at 8000r / min, wash with methanol three times and dry in an oven at 60°C for later use. attached by figure 1 It can be seen that the shape of the prepared precursor is hexagonal rhombus, uniform in size, and the diameter is about 300-400nm. It can be seen from the picture that the inside is a hexagonal rhombus, and the outside is a layer of small granular iron.

[0029] Step 2: Synthesis of ZIF-67@Fe-LDH struct...

Embodiment 2

[0034] The first step: the preparation of ZIF-67 precursor:

[0035]Dissolve 0.291g of sodium cobaltate nitrate in 20mL of methanol and then stir in a magnetic stirrer at a speed of 400r / min for 5min until completely dissolved and marked as solution A. Dissolve 0.658g of 2-methylimidazole in 20mL of methanol, stir in a magnetic stirrer at a speed of 400r / min for 5min until completely dissolved, and mark it as solution B. Quickly pour solution B into solution A and stir for 5 minutes, let stand at room temperature for 24 hours, collect samples by centrifugation at 8000r / min, wash with methanol three times and dry in an oven at 60°C for later use.

[0036] Step 2: Synthesis of ZIF-67@Fe-LDH structure

[0037] The resulting 0.05 g of ZIF-67 was dissolved in 5 mL of ethanol, marked as solution C, and sonicated for 10 min. The potassium ferricyanide of 0.05g and the PVP that 0.63g molecular weight is 10000 are dissolved in the ethanol solution that 40mL volume fraction is 50%, ma...

Embodiment 3

[0041] The first step: the preparation of ZIF-67 precursor:

[0042] Dissolve 0.291g of sodium cobaltate nitrate in 20mL of methanol and then stir in a magnetic stirrer at a speed of 400r / min for 5min until completely dissolved, which is marked as solution A. Dissolve 0.658g of 2-methylimidazole in 20 mL of methanol, stir for 5min at a speed of 400r / min in a magnetic stirrer until completely dissolved, and mark it as B solution. Quickly pour solution B into solution A and stir for 5 minutes, let stand at room temperature for 24 hours, collect samples by centrifugation at 8000r / min, wash with methanol three times and dry in an oven at 60°C for later use.

[0043] Step 2: Synthesis of ZIF-67@Fe-LDH structure material

[0044] The resulting 0.05 g of ZIF-67 was dissolved in 5 mL of ethanol, marked as solution C, and sonicated for 10 min. The potassium ferricyanide of 0.05g and the PVP that 0.63g molecular weight is 10000 are dissolved in the ethanol solution that 40mL volume fr...

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Abstract

The invention relates to a preparation method of a cobalt-iron bimetal selenide sodium ion battery negative electrode material, which synthesizes a FeSe2 (at) CoSe2 heterostructure through a simple and convenient method so as to enhance the electrochemical properties of a sodium ion battery. The method comprises the following steps: firstly, synthesizing a precursor of ZIF-67, then growing a Fe metal layer on the surface through ion adsorption, and carrying out high-temperature selenylation calcination to obtain the core-shell structure material with a uniform heterogeneous interface. The ferrocobalt bimetal selenide material prepared by the method is used as a negative electrode material to be applied to the sodium-ion battery, so that the cycle performance of the sodium-ion battery is remarkably improved, the capacity of the battery is improved, the service life of the battery is prolonged, and the volume expansion in the charging and discharging process is effectively inhibited.

Description

technical field [0001] The technical scheme of the present invention relates to a kind of preparation method of cobalt-iron double metal selenide sodium ion battery negative electrode material, belongs to the field of material chemistry. Background technique [0002] Lithium-ion batteries have attracted the attention of researchers due to their high energy density, long cycle life, and environmental friendliness, and are widely used in various fields, such as portable electronics and electric vehicles. However, due to the relatively low specific capacity of graphite as the negative electrode of lithium-ion batteries, it cannot meet the requirements of rapid market development. Therefore, it is urgent to find a new system to replace it. Sodium metal has a large amount of storage on the earth and its price is relatively low. Although sodium ions are similar to lithium-ion batteries in the process of charging and discharging, because the ionic radius of sodium is larger than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054B82Y40/00
CPCB82Y40/00H01M4/581H01M4/625H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 董玉成林叶茂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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