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Nickel phosphide composite electrode and preparation method and application thereof

A composite electrode, nickel phosphide technology, used in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, battery electrodes, etc., can solve the problems of reducing the bonding force at the interface of materials, discounting electrode cycle life, and difficult to industrialize applications. Achieve controllable balance of conductivity and capacity, good cycle performance, and firm adhesion

Active Publication Date: 2022-03-04
PLA OF CHINA AIR FORCE EARLY WARNING ACADEMY LEIDA SERGEANT SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this measure will lead to other problems: first, the multiple growth of active materials is cumbersome and difficult for industrial application; second, the growth of active materials several times before and after will significantly reduce the bonding force at the interface of each material, making the overall The cycle life of the electrode is greatly reduced

Method used

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  • Nickel phosphide composite electrode and preparation method and application thereof
  • Nickel phosphide composite electrode and preparation method and application thereof
  • Nickel phosphide composite electrode and preparation method and application thereof

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preparation example Construction

[0032] Based on the same inventive concept, the embodiment of the present application also provides a method for preparing the above-mentioned nickel phosphide composite electrode, comprising the following steps:

[0033] S1. Prepare a mixed solution containing nickel salt, triton and reducing agent, then heat it to 55-65° C., heat up to 66-75° C. after the reaction, and continue the reaction to obtain a nickel hydroxide nanosheet / nickel nanowire precursor;

[0034] S2. Put the nickel hydroxide nanosheet / nickel nanowire precursor and the phosphating additive in a tube furnace, raise the temperature to 300-400° C. under a protective atmosphere, and obtain the nickel phosphide composite electrode after phosphating.

[0035] It should be noted that the specific preparation method of the mixed solution of this application is: add nickel salt, triton and reducing agent to water, and stir evenly to obtain the mixed solution; the nickel hydroxide nanosheet / nickel nanowire precursor in...

Embodiment 1

[0048] The embodiment of the present application provides a method for preparing a nickel phosphide composite electrode, comprising the following steps:

[0049] S1. Prepare a mixed solution containing nickel salt, triton and hydrazine hydrate, then heat it to 62°C, keep it warm for 30 minutes, then raise the temperature to 70°C, keep it warm until the solution is clear, collect, wash, and dry to obtain nickel hydroxide nano Sheet / nickel nanowire precursor;

[0050] S2. Put the nickel hydroxide nanosheet / nickel nanowire precursor and excess sodium dihydrogen hypophosphite in a tube furnace, and raise the temperature to 350°C at a heating rate of 1°C / min under a hydrogen / argon mixed atmosphere, and then phosphate After annealing for 2 hours, cool to room temperature and collect samples to obtain a composite electrode of "nickel phosphide nanosheet / nickel@nickel phosphide nanowire" (that is, nickel phosphide composite electrode);

[0051] Wherein, the nickel salt in the mixed s...

Embodiment 2

[0053] The embodiment of the present application provides a method for preparing a nickel phosphide composite electrode, comprising the following steps:

[0054] S1. Prepare a mixed solution containing nickel salt, triton and hydrazine hydrate, then heat it to 62°C, keep it warm for 30 minutes, then raise the temperature to 70°C, keep it warm until the solution is clear, collect, wash, and dry to obtain nickel hydroxide nano Sheet / nickel nanowire precursor;

[0055] S2. Put the nickel hydroxide nanosheet / nickel nanowire precursor and excess sodium dihydrogen hypophosphite in a tube furnace, and raise the temperature to 350°C at a heating rate of 1°C / min under a hydrogen / argon mixed atmosphere, and then phosphate After annealing for 1 hour, cool to room temperature to collect the sample, and obtain the composite electrode of "nickel phosphide nanosheet / nickel@nickel phosphide nanowire" (that is, nickel phosphide composite electrode);

[0056] Wherein, the nickel salt in the mi...

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Abstract

The invention provides a nickel phosphide composite electrode as well as a preparation method and application thereof. The composite electrode comprises a nickel nanowire core layer, a nickel phosphide shell layer coated outside the core layer and a nickel phosphide nanosheet positioned on the surface of the nickel phosphide shell layer. According to the preparation method, the process is simple and controllable, production is easy, all components of the composite electrode are firmly attached, and good cycle performance is shown; the nickel hydroxide nanosheets rich in active sites and the nickel nanowires are synchronously phosphatized in the subsequent annealing step, so that the damage to the electrode material caused by multiple phosphatization is avoided; according to the method, a high-conductivity elemental nickel component which does not provide pseudocapacitance performance is controllably and partially converted into nickel phosphide with high pseudocapacitance performance, so that the mass ratio of a non-capacitance active material in the composite electrode is reduced, and the controllable balance of conductivity and capacity is realized; the nickel phosphide shell generated on the surface layer and the nickel phosphide nanosheet form a homojunction or heterojunction structure, high electrochemical performance is shown, and good specific capacity and rate capability are achieved.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a nickel phosphide composite electrode and its preparation method and application. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have higher energy density than traditional capacitors and higher power density than batteries. In addition, they also have a series of advantages such as short charge and discharge time, long cycle life, high current shock resistance, and wide operating temperature range. . Therefore, supercapacitors have achieved good performance in portable electronic devices, electric vehicles, energy storage, and military applications, showing broad application prospects. [0003] However, the relatively low energy density of supercapacitors compared with batteries has been widely criticized, which seriously restricts the development of supercapacitors. Therefore, pseudocapacitive materials with high capacity hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/24H01G11/86H01M4/134H01M4/136H01M4/1395H01M4/1397H01M10/052
CPCH01G11/30H01G11/24H01G11/86H01M4/134H01M4/136H01M4/1395H01M4/1397H01M10/052Y02E60/10
Inventor 陈柯宇王骏哲张丰刘延斌吴胜华刘幸张俊哲胡亦良贾强李燕张小涵
Owner PLA OF CHINA AIR FORCE EARLY WARNING ACADEMY LEIDA SERGEANT SCHOOL
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