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Preparation method of bi-metal selenide sodium-ion battery cathode material

A sodium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of poor cycle life and stability, and achieve the effect of increasing specific capacity, good conductivity, and inhibiting volume expansion

Active Publication Date: 2020-02-04
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

Studies have shown that MoSe 2 and CoSe 2 The sodium storage mechanism involves the conversion process, however, due to the volume change of the battery during charging and discharging, bulk MoSe 2 and CoSe 2 Poor performance in terms of cycle life and stability performance

Method used

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  • Preparation method of bi-metal selenide sodium-ion battery cathode material
  • Preparation method of bi-metal selenide sodium-ion battery cathode material
  • Preparation method of bi-metal selenide sodium-ion battery cathode material

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Experimental program
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Embodiment 1

[0026] Step 1: Preparation of MoO 3 Nanorod precursors:

[0027] Dissolve 1.4g sodium molybdate tetrahydrate in 40mL of nitric acid solution, the nitric acid solution is a mixed solution obtained by diluting 65wt% nitric acid with 5 times the volume of water, and stir for 10min at a speed of 400r / min in a magnetic stirrer . The obtained solution was transferred to a 100 mL reactor and reacted in an oven at 200° C. for 20 h. After the reaction, cool to room temperature, collect the samples by centrifugation at 10,000 r / min for 3 minutes, wash the samples three times with water and ethanol respectively, and dry them in an oven at 60°C for use.

[0028] Depend on figure 1 A shows that the shape of the prepared precursor is long nanosheets, uniform in size, about 5-6μm in length, and about 300-400nm in diameter. figure 1 In B, it can be seen that there are MoO3 nanorods inside and a thin layer of Co-MOF nanosheets outside.

[0029] Step 2: Synthesis of MoO 3 @Co-MOF

[0030...

Embodiment 2

[0037] Step 1: Preparation of MoO 3 Nanorod precursors:

[0038] Dissolve 1.4g sodium molybdate tetrahydrate in 40mL of nitric acid solution, the nitric acid solution is a mixed solution obtained by diluting 65wt% nitric acid with 5 times the volume of water, and stir for 10min at a speed of 400r / min in a magnetic stirrer . The obtained solution was transferred to a 100 mL reactor and reacted in an oven at 200° C. for 20 h. After the reaction, cool to room temperature, collect the samples by centrifugation at 10,000 r / min for 3 minutes, wash the samples three times with water and ethanol respectively, and dry them in an oven at 60°C for use.

[0039] Step 2: Synthesis of MoO 3 @Co-MOF material

[0040] The MoO obtained by 0.05g 3 The nanorods were dissolved in 10 mL of methanol, treated with ultrasound for 10 minutes, then added 0.293 g of cobalt nitrate hexahydrate, and continued to sonicate for 10 minutes to prepare solution A. Add 10 mL of methanol to another beaker, ...

Embodiment 3

[0044] Step 1: Preparation of MoO 3 Nanorod precursors:

[0045] Dissolve 1.4g sodium molybdate tetrahydrate in 40mL of nitric acid solution, the nitric acid solution is a mixed solution obtained by diluting 65wt% nitric acid with 5 times the volume of water, and stir for 10min at a speed of 400r / min in a magnetic stirrer . The obtained solution was transferred to a 100 mL reactor and reacted in an oven at 200° C. for 20 h. After the reaction, cool to room temperature, collect the samples by centrifugation at 10,000 r / min for 3 minutes, wash the samples three times with water and ethanol respectively, and dry them in an oven at 60°C for use. Step 2: Synthesis of MoO 3 @Co-MOF material

[0046] The MoO obtained by 0.05g 3 The nanorods were dissolved in 10 mL of methanol, treated with ultrasound for 10 minutes, then added 0.293 g of cobalt nitrate hexahydrate, and continued to sonicate for 10 minutes to prepare solution A. Add 10 mL of methanol to another beaker, add 0.63 ...

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Abstract

The invention relates to a preparation method of a bi-metal selenide sodium-ion battery cathode material. According to the preparation method, an MoSe2@CoSe2@C heterostructure is synthesized through asimple process so as to realize the aim of enhance the electrochemical performance of the sodium-ion batteries. According to the method, an MoO3 nanorod is firstly synthesized, a layer of Co-MOF nanosheet is grown on the surface of the MoO3 nanorod, and high-temperature selenylation calcination is carried out to obtain a core-shell structure with a uniform heterogenous interface, so that the iondiffusion kinetics can be improved and the electron conductivity can be improved, thereby improving the electrochemical performance of the batteries. Compared with the pure MoSe2, an SIB taking the MoSe2@CoSe2@C heterostructure as a cathode shows a remarkably improved specific capacity and excellent cycling stability and rate performance.

Description

technical field [0001] The invention relates to a preparation method of a double metal selenide sodium ion battery negative electrode material, belonging to the field of material chemistry. Background technique [0002] With the rapid development of energy technology, the demand for energy supply in modern society is increasing. In order to reduce the dependence on fossil fuels, it is urgent to turn to sustainable energy. Rechargeable batteries have attracted much attention due to their high energy density and long cycle life. Lithium-ion batteries (LIBs) have been widely used in portable electronics for nearly three decades and are considered to be the most promising power batteries for electric vehicles. The core issue of lithium-ion batteries is to further increase their energy density. At present, graphite is the most common anode material for lithium-ion batteries widely used in commerce, but the further development of lithium-ion batteries is limited due to the relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y40/00
CPCH01M4/366H01M4/581H01M4/625H01M4/628H01M10/054B82Y40/00H01M2004/027Y02E60/10
Inventor 董玉成林叶茂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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