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Sodium-ion battery metal selenide negative electrode material and preparation method and application thereof

A metal selenide, sodium-ion battery technology, applied in battery electrodes, selenium/tellurium compounds, chemical instruments and methods, etc., can solve problems such as poor electronic conductivity, increase capacitance behavior, solve poor electronic conductivity, and improve ion diffusion The effect of dynamics

Pending Publication Date: 2022-07-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the inherent poor electronic conductivity of bulk metal selenides, the object of the present invention is to provide a metal selenide negative electrode material for a sodium ion battery and its preparation method and application

Method used

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  • Sodium-ion battery metal selenide negative electrode material and preparation method and application thereof
  • Sodium-ion battery metal selenide negative electrode material and preparation method and application thereof
  • Sodium-ion battery metal selenide negative electrode material and preparation method and application thereof

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Effect test

Embodiment 1

[0036] A method for preparing a metal selenide negative electrode material for a sodium ion battery, comprising the following steps:

[0037] Step (1): Weigh 4.8 g of antimony triselenide (Sb 2 Se 3 ) and 5.8 g of polyvinylpyrrolidone (PVP) were uniformly mixed and dissolved in 1 L of methanol solution.

[0038] Step (2): add 11.9g of zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O), stir at 30°C for 48h to Sb 2 Se 3 with Zn(NO 3 ) 2 ·6H 2 O is uniformly dispersed in methanol solution to form solution A.

[0039] Step (3): Dissolve 49.2 g of 2-methylimidazole in 1 L of methanol solution to form solution B.

[0040] Step (4): slowly add solution B to solution A, and stir vigorously for 30 min until the reaction is complete. Centrifuge and wash three times under the condition of rotating speed 8000rpm, and the obtained product was placed in a vacuum drying box and dried at 80°C for 12h.

[0041] Step (5): The obtained precursor is heat-treated in a tube furnace at 800°...

Embodiment 2

[0047] A method for preparing a metal selenide negative electrode material for a sodium ion battery, comprising the following steps:

[0048] Step (1): Weigh 4.8 g of antimony triselenide (Sb 2 Se 3 ) and 5.8 g of polyvinylpyrrolidone (PVP) were uniformly mixed and dissolved in 1 L of methanol solution.

[0049] Step (2): add 2.9g zinc nitrate hexahydrate (Zn(NO) to above-mentioned solution 3 ) 2 ·6H 2 O), stir at 30°C for 48h to Sb 2 Se 3 with Zn(NO 3 ) 2 ·6H 2 O is uniformly dispersed in methanol solution to form solution A.

[0050] Step (3): Dissolve 16.4 g of 2-methylimidazole in 1 L of methanol solution to form solution B.

[0051] Step (4): slowly add solution B to solution A, and stir vigorously for 30 min until the reaction is complete. Centrifuge and wash three times under the condition of rotating speed 8000rpm, and the obtained product was placed in a vacuum drying box and dried at 80°C for 12h.

[0052] Step (5): The obtained precursor is heat-treated ...

Embodiment 3

[0054] A method for preparing a metal selenide negative electrode material for a sodium ion battery, comprising the following steps:

[0055] Step (1): Weigh 4.8 g of antimony triselenide (Sb 2 Se 3 ) and 5.8 g of polyvinylpyrrolidone (PVP) were uniformly mixed and dissolved in 1 L of methanol solution.

[0056] Step (2): add 14.9g of zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O), stir at 30°C for 48h to Sb 2 Se 3 with Zn(NO 3 ) 2 ·6H 2 O is uniformly dispersed in methanol solution to form solution A.

[0057] Step (3): Dissolve 82.1 g of 2-methylimidazole in 1 L of methanol solution to form solution B.

[0058] Step (4): slowly add solution B to solution A, and stir vigorously for 30 min until the reaction is complete. Centrifuge and wash three times under the condition of rotating speed 8000rpm, and the obtained product was placed in a vacuum drying box and dried at 80°C for 12h.

[0059] Step (5): The obtained precursor is heat-treated in a tube furnace at 800°...

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Abstract

The invention discloses a sodium ion battery metal selenide negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that metal selenide, a dispersing agent, metal salt and imidazole organic matter are mixed in a methanol solution, and a uniform metal organic framework coating layer is generated on the surface of the metal selenide in situ; and carrying out heat treatment on the obtained precursor in a protective atmosphere to obtain the electrode material. According to the method disclosed by the invention, an additional selenium source does not need to be introduced, and the composite material with two different types of metal selenide can be obtained through one-step heat treatment. According to the composite material, a large number of selenium vacancies are induced to be generated by virtue of moderate lattice mismatch between two different metal selenide. The introduction of selenium vacancy can solve the inherent low electron conductivity problem of bulk metal selenide, improve ion / electron transport kinetics, and improve the electrochemical performance of the material. The preparation method provided by the invention is simple to operate, can be expanded and applied to preparation of various negative electrode materials, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of negative electrode materials for sodium ion batteries, in particular, to a metal selenide negative electrode material for sodium ion batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are currently the most commercially successful electrochemical energy storage devices, and are now widely used in portable electronic devices and electric vehicles. However, the reserves of lithium resources are limited and unevenly distributed, which severely limits the development of large-scale energy storage. Therefore, it is particularly important to construct a new energy storage system to replace lithium-ion batteries. Sodium and lithium have similar physical and chemical properties, and sodium resources are abundant and widely distributed, which makes it feasible to replace lithium-ion batteries and large-scale energy storage. However, the radius of Na ions is larg...

Claims

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Application Information

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IPC IPC(8): C01B19/00C01B32/05H01M4/36H01M4/58H01M4/62H01M10/054
CPCC01B19/007C01B32/05H01M4/58H01M4/366H01M4/628H01M10/054H01M2004/027C01P2004/80C01P2004/03C01P2002/85C01P2004/30C01P2004/61C01P2004/62C01P2006/40Y02E60/10
Inventor 李雨白莹巩玉腾吴川吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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