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Integrated electrode NiSe(at)CNFs with self-supporting structure as well as preparation method and application of integrated electrode NiSe(at)CNFs

A self-supporting structure and electrode technology, applied in structural parts, battery electrodes, circuits, etc., can solve the problems of insufficient rate performance and cycle stability of sodium ion batteries, volume changes of sodium ion insertion and extraction, and slow reaction kinetics. Achieve good cycle stability, ensure fast electron transport, and ensure the effect of structural integrity

Active Publication Date: 2021-06-11
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the disadvantages of the sodium ion battery in the prior art, when the sodium ion battery is used as the negative electrode material, there is a large volume change and slow reaction kinetics during the intercalation and extraction of sodium ions, resulting in insufficient rate performance and cycle stability of the sodium ion battery. Firstly, a preparation method for the integrated electrode NiSe@CNFs with self-supporting structure is provided

Method used

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  • Integrated electrode NiSe(at)CNFs with self-supporting structure as well as preparation method and application of integrated electrode NiSe(at)CNFs
  • Integrated electrode NiSe(at)CNFs with self-supporting structure as well as preparation method and application of integrated electrode NiSe(at)CNFs
  • Integrated electrode NiSe(at)CNFs with self-supporting structure as well as preparation method and application of integrated electrode NiSe(at)CNFs

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Embodiment 1

[0035] An integrated electrode NiSe@CNFs with a self-supporting structure, the preparation process is as follows:

[0036] (1) Preparation of precursor material: Dissolve 1.64g of nickel acetate tetrahydrate in 24ml of DMF solution to obtain solution A; dissolve 1.0g of trimesic acid in 25ml of N,N-dimethylformamide in DMF solution , to obtain solution B; after mixing solution A and B, add 1ml of TEA solution, centrifuge, wash, and dry to obtain the precursor;

[0037] (2) Dissolve 0.8g of the precursor and 0.8g of polyacrylonitrile PAN in 10ml of DMF solution, and mix to obtain a uniformly dispersed emulsion;

[0038] (3) electrospinning the emulsion to obtain nanofibers;

[0039] (4) Put nanofibers and selenium powder in a corundum crucible with a mass ratio of 1:2, and heat them in a tube furnace at 2°C min -1 The temperature was increased from 20 °C to 500 °C at a heating rate of 4 h, and NiSe@CNFs were obtained.

Embodiment 2

[0041] An integrated electrode NiSe@CNFs with a self-supporting structure, the preparation process is as follows:

[0042] (1) Preparation of precursor material: 2.21g of nickel acetylacetonate was dissolved in 24ml of DMF solution to obtain solution A; 1.0g of trimesic acid was dissolved in 25ml of N,N-dimethylformamide DMF solution, Obtain solution B; after mixing solution A and B, add 1ml of TEA solution, centrifuge, wash, and dry to obtain the precursor;

[0043] (2) Dissolve 0.8g of the precursor and 0.8g of polyacrylonitrile PAN in 10ml of DMF solution, and mix to obtain a uniformly dispersed emulsion;

[0044] (3) electrospinning the emulsion to obtain nanofibers;

[0045] (4) Put nanofibers and selenium powder in a corundum crucible with a mass ratio of 1:2, and heat them in a tube furnace at 2°C min -1 The temperature was increased from 20 °C to 500 °C at a heating rate of 4 h, and NiSe@CNFs were obtained.

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Abstract

The invention belongs to the technical field of electrochemical sodium ion batteries. An integrated electrode NiSe(at)CNFs with a self-supporting structure is prepared by utilizing electrostatic spinning and high-temperature selenylation. Electrospinning is carried out on organic polymer macromolecules and precursor nanoparticles, and then selenylation is carried out under the condition of high temperature, so that the integrated electrode NiSe(at)CNFs with a self-supporting structure is obtained. NiSe nanoparticles are embedded into carbon nanofibers, and the carbon nanofibers serve as a buffer layer to adapt to volume change, so that the structural integrity is ensured, and the battery has good cycle stability; and on the other hand, the carbon fiber provides a conductive network for NiSe, so that rapid electron transmission and Na < + > migration are ensured, reaction kinetics is promoted, and the rate capability of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical sodium-ion batteries, and more specifically, to an integrated electrode NiSe@CNFs with a self-supporting structure and its preparation method and application. Background technique [0002] Since the successful commercialization of lithium-ion batteries in the 1990s, they have been widely used in portable digital products. People's utilization of lithium resources has greatly increased. The problems of limited lithium resources and high cost of lithium-ion batteries have limited the development of lithium-ion batteries. . At present, due to the advantages of rich resources, low price and easy availability of sodium, the research on sodium-ion batteries is in a boom, and it is expected to use sodium-ion batteries for large-scale energy storage in the future. However, compared with lithium ions, the larger ionic radius of sodium ions results in slower sodium storage reaction kinetics and lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/58H01M4/625H01M10/054Y02E60/10
Inventor 商超群醋俏胡乐王新
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV