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Negative electrode composite material for sodium ion battery and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, carbon preparation/purification, etc., can solve poor electronic conductivity, limit the rate performance of sodium-ion batteries, cycle stability, volume expansion, etc. problems, achieve good industrialization prospects, improve charge specific capacity and rate performance, and stabilize crystal structure

Active Publication Date: 2020-10-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such materials generally have poor electronic conductivity and are prone to severe volume expansion during electrochemical cycling, which limits the rate performance and cycle stability of sodium-ion batteries.

Method used

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  • Negative electrode composite material for sodium ion battery and preparation method thereof
  • Negative electrode composite material for sodium ion battery and preparation method thereof
  • Negative electrode composite material for sodium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a carbon-coated bimetallic sulfide composite material for a negative electrode of a sodium ion battery, comprising the following steps:

[0036] 2.48g tungsten disulfide (WS 2 ) powder material and 4g polyvinylpyrrolidone (PVP) were uniformly mixed and dissolved in 1L methanol solution, and then 8.93g zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O), stirred at 30°C for 48h at a stirring speed of 300rpm to WS 2 with Zn(NO 3 ) 2 ·6H 2 O was uniformly dispersed in methanol solution to form solution A.

[0037] Solution B was formed by dissolving 24.62 g of dimethylimidazole in 1 L of methanol solution. Solution B was slowly added to solution A, and the stirring was continued for 60 min until the reaction was complete. Centrifuge and wash three times under the condition of rotating speed of 6000 rpm, and place the obtained product in a vacuum drying oven to dry at 80° C. for 12 hours.

[0038]The dried material was heated to 800°C at a rate of...

Embodiment 2

[0044] A method for preparing a carbon-coated bimetallic sulfide composite material for a negative electrode of a sodium ion battery, comprising the following steps:

[0045] 2.48g tungsten disulfide (WS 2 ) powder material and 4g polyvinylpyrrolidone (PVP) were uniformly mixed and dissolved in 1L methanol solution, and then 2.97g zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O), stirred at 30°C for 48h at a stirring speed of 300rpm to WS 2 with Zn(NO 3 ) 2 ·6H 2 O was uniformly dispersed in methanol solution to form solution A.

[0046] Solution B was formed by dissolving 8.21 g of dimethylimidazole in 1 L of methanol solution. Solution B was slowly added to solution A, and the stirring was continued for 60 min until the reaction was complete. Centrifuge and wash three times under the condition of rotating speed of 6000 rpm, and place the obtained product in a vacuum drying oven to dry at 80° C. for 12 hours.

[0047] The dried material was heated to 800°C at a rate of...

Embodiment 3

[0049] A method for preparing a carbon-coated bimetallic sulfide composite material for a negative electrode of a sodium ion battery, comprising the following steps:

[0050] 2.48g tungsten disulfide (WS 2 ) powder material and 4g polyvinylpyrrolidone (PVP) were uniformly mixed and dissolved in 1L methanol solution, and then 14.89g zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O), stirred at 30°C for 48h at a stirring speed of 300rpm to WS 2 with Zn(NO 3 ) 2 ·6H 2 O was uniformly dispersed in methanol solution to form solution A.

[0051] Solution B was formed by dissolving 41.05 g of dimethylimidazole in 1 L of methanol solution. Solution B was slowly added to solution A, and the stirring was continued for 60 min until the reaction was complete. Centrifuge and wash three times under the condition of rotating speed of 6000 rpm, and place the obtained product in a vacuum drying oven to dry at 80° C. for 12 hours.

[0052] The dried material was heated to 800°C at a rate ...

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Abstract

The invention relates to a sodium-ion battery negative electrode composite material and a preparation method thereof, wherein a uniform metal organic framework coating layer is generated on the surface of a metal sulfide in situ, and calcining is performed to obtain a carbon-coated bimetallic sulfide composite material for a sodium-ion battery negative electrode. According to the invention, the preparation method is simple and convenient, does not require the adding of an additional sulfur source, and can prepare the bimetal sulfide with the carbon coating layer and the heterostructure in onestep; and the built-in electric field effect generated by the heterojunction formed by the two metal sulfides in the obtained composite material can significantly improve the surface reaction kineticsof the material and accelerate the charge transfer, so that the prepared sodium ion battery has excellent rate capability and good structural stability.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode composite material of a sodium ion secondary battery. Background technique [0002] With the unscientific use of fossil fuels such as coal, oil, and natural gas, a series of environmental pollution problems have been caused, making environmental pollution and energy depletion a serious problem in today's society. It is urgent to vigorously develop renewable energy such as solar energy, wind energy, Tidal energy, etc. to improve the existing ecological environment. However, the intermittency of this type of energy seriously interferes with the normal operation of the smart grid. Therefore, the development of reliable and stable energy storage devices is the key to achieving sustainable output of clean energy. [0003] Lithium-ion batteries, as the most concerned and fastest-growing new energy storage devices, have been widely used in portable electronic devices and pure electric and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62C01G9/08C01B32/05
CPCB82Y30/00B82Y40/00C01G9/08C01G41/00C01P2002/72C01P2004/03C01P2004/04C01P2004/64C01P2004/80C01P2006/40C01B32/05H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 吴锋李雨吴川白莹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY