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Selenide-containing composite material and preparation method and application thereof

A composite material and a selenide technology, which are applied in the field of selenide-containing composite materials and the preparation thereof, can solve the problems of difficult control of the structure of the selenide material, difficulty in the preparation of the high-performance multi-element metal selenide composite structure, etc. Controllable, high specific capacity effect

Active Publication Date: 2021-11-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the difficulty in controlling the structure of the selenide material obtained by the one-step hydrothermal method, resulting in the difficult defect of preparing a high-performance multi-element metal selenide composite structure, thereby providing a composite material containing selenide and its Preparation method and application

Method used

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  • Selenide-containing composite material and preparation method and application thereof
  • Selenide-containing composite material and preparation method and application thereof
  • Selenide-containing composite material and preparation method and application thereof

Examples

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Embodiment 1

[0044] This embodiment provides a method for preparing a composite material containing selenide, which specifically includes the following steps,

[0045] (1) Take 3.2mmol NaSnO 3 Add to 60mL deionized water to form NaSnO 3 Aqueous solution; ultrasonically disperse 50mg of graphene oxide powder into 95mL of deionized water for 30min to form an aqueous solution of graphene oxide; dissolve 3.2mmol of CuSO 4 ·5H 2 O was added to the graphene oxide aqueous solution, placed in a cold bath, stirred and cooled to 0°C, 800mL of ammonia water was added to it, the pH was adjusted to 9, and the solution was stirred rapidly until the color of the solution turned dark blue, and then NaSnO was added drop by drop. 3 Aqueous solution, dropwise time is 30min, obtain CuSn(OH) 6 Precipitation; CuSn(OH) 6 After the precipitate was centrifuged at high speed, washed with water and alcohol until the filtrate was neutral, it was dried in an oven for 24 hours to obtain CuSn(OH) 6 powder; then the...

Embodiment 2

[0057] This embodiment provides a method for preparing a composite material containing selenide, which specifically includes the following steps,

[0058] (1) Take 2.8mmol NaSnO 3 Add to 60mL deionized water to form NaSnO 3 aqueous solution; ultrasonically disperse 55 mg of graphene oxide powder into 95 mL of deionized water for 30 min to form an aqueous solution of graphene oxide; 3.2 mmol of Fe(NO 3 ) 2 Add graphene oxide aqueous solution, put it in a cold bath, stir and cool to 0°C, add 700mL ammonia water to it, adjust the pH to 8, stir quickly, and then add NaSnO drop by drop 3 Aqueous solution, dropwise time is 30min, obtain FeSn(OH) 6 Precipitation; FeSn(OH) 6 After the precipitate is centrifuged at high speed, washed with water and alcohol until the filtrate is neutral, it is dried in an oven for 24 hours to obtain FeSn(OH) 6 powder; then the powder was calcined in a tube furnace at 350°C for 2h to obtain FeSnO 3 powder. Wherein, the centrifugation time is 10 mi...

Embodiment 3

[0062] This embodiment provides a method for preparing a composite material containing selenide, which specifically includes the following steps,

[0063] (1) Take 3.4mmolNaSnO 3 Add to 60mL deionized water to form NaSnO 3 aqueous solution; ultrasonically disperse 60 mg of graphene oxide powder into 95 mL of deionized water for 30 min to form an aqueous solution of graphene oxide; dissolve 3.2 mmol of NiSO 4 ·6H 2 O was added to the graphene oxide aqueous solution, placed in a cold bath and stirred to cool to 0°C, and 1000mL of ammonia water was added to it, and the pH was adjusted to 10, stirred rapidly, and then NaSnO was added drop by drop. 3 Aqueous solution, dropwise time is 30min, get NiSn(OH) 6 Precipitation; NiSn(OH) 6 After the precipitate is centrifuged at high speed, washed with water and alcohol until the filtrate is neutral, it is dried in an oven for 24 hours to obtain NiSn(OH) 6 powder; then the powder was calcined in a tube furnace at 350°C for 2h to obtai...

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Abstract

The invention belongs to the technical field of sodium ion battery negative electrode material preparation, and particularly relates to a selenide-containing composite material and a preparation method and application thereof. The preparation method comprises the following three steps: preparing metal oxide microspheres, preparing a selenium-containing solution and preparing a selenide-containing composite material. The transition metal hydroxide is prepared through a coprecipitation method, and bimetallic components (tin and transition metal) are effectively introduced; a metal oxide microsphere structure is obtained through calcining; selenium ions are obtained from selenium powder through a reducing agent, the metal oxide microsphere structure is used as a template, and the selenium ions are exchanged with oxygen in the metal oxide microsphere structure; therefore, the selenide which is high in purity, good in crystal form and complete and controllable in structure and contains double metal components is obtained, and the controllable structure of the selenide-containing composite material is achieved by controlling the structure of the metal oxidized microspheres; the selenide-containing composite material is of an eggshell structure, and the structure can increase the specific surface area and active sites of the material, so that the sodium storage capacity of the selenide-containing composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for sodium ion batteries, and in particular relates to a composite material containing selenide and its preparation method and application. Background technique [0002] With the rapid development of industry, people exploit fossil fuels in large quantities, resulting in a serious energy crisis, and traditional energy sources such as coal and oil have caused great pollution to the environment. Facing the energy crisis and the deteriorating environment, the country is actively carrying out energy structure transformation. Green energy such as wind energy, tidal energy, and solar energy is discontinuous and unstable, and there is a large amount of abandoned wind and water in the process of use. Energy storage devices need to be used to store and utilize energy efficiently. [0003] Secondary batteries have been widely developed as an energy storage device, and li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054
CPCH01M4/628H01M4/625H01M4/581H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 黄永鑫张蒙蒙陈人杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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