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Total phosphate electrode material and preparation method thereof

A technology of electrode material and full phosphate, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve problems such as poor stability, poor rate performance of bimetallic nickel-cobalt phosphide, and unsatisfactory cycle performance. High energy density, beneficial to flow and conduction, and enhanced electrochemical reactivity

Pending Publication Date: 2022-04-29
NINGBO NOTTINGHAM NEW MATERIALS INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, bimetallic nickel-cobalt phosphides have disadvantages such as poor rate performance and poor stability, and the cycle performance has not been ideal.

Method used

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  • Total phosphate electrode material and preparation method thereof
  • Total phosphate electrode material and preparation method thereof
  • Total phosphate electrode material and preparation method thereof

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preparation example Construction

[0047] The embodiment of the present invention provides a kind of preparation method of all-phosphate electrode material, comprises the following steps:

[0048] S1. Growing sheet-shaped nickel-cobalt phosphate on the surface of the substrate by a hydrothermal method to obtain the substrate loaded with the sheet-shaped nickel-cobalt phosphate;

[0049] S2. Using the substrate supporting the flaky nickel-cobalt phosphate as a working electrode, deposit nickel-cobalt hydrogen phosphate on the surface of the flaky nickel-cobalt phosphate by electrodeposition to obtain a full phosphate electrode material.

[0050] The sheet structure of single nickel cobalt phosphate is unstable and easy to collapse. Based on this, the present invention selects two different nickel-cobalt phosphate materials as battery-type capacitor materials for compounding, using sheet-shaped nickel-cobalt phosphate as the basis to provide a large number of deposition sites, and then compounding on it with high...

Embodiment 1

[0072] The preparation of the substrate of embodiment 1 load sheet-shaped nickel-cobalt phosphate

[0073] The sheet-shaped nickel-cobalt phosphate is grown on the surface of the substrate by a hydrothermal method to obtain a substrate loaded with sheet-shaped nickel-cobalt phosphate; the specific operations include:

[0074] S11, using water as a solvent, preparing a mixed solution containing nickel chloride and cobalt chloride, adding dipotassium hydrogen phosphate solution dropwise thereto, and then mixing and stirring for 30 minutes to make it evenly mixed to obtain a reaction solution, in which nickel ions and The total molar concentration of cobalt ions is 1.8mM, and the molar concentration of hydrogen phosphate ions is 1.2mM;

[0075] S12. Pour 10mL of the reaction solution into a 25mL reactor, add nickel foam as a substrate, and conduct a hydrothermal reaction at 150°C for 12 hours. After the reaction is completed, the product is washed and dried to obtain a substrate ...

Embodiment 2

[0082] The preparation of embodiment 2 full phosphate electrode material

[0083] A preparation method for an all-phosphate electrode material, comprising the following steps:

[0084] S1. Growth of flaky nickel-cobalt phosphate on the surface of the substrate by hydrothermal method to obtain a substrate loaded with flaky nickel-cobalt phosphate, the specific operation is the same as that of Example 1;

[0085] In the present embodiment, the molecular formula of nickel-cobalt phosphate is: Ni 2 Co(PO 4 ) 2 ;

[0086] S2. A three-electrode system is constructed with the substrate loaded with sheet-like nickel-cobalt phosphate as the working electrode, Pt as the counter electrode, and Ag / AgCl as the reference electrode. The three-electrode system is placed in the electrolyte and scanned by cyclic voltammetry for 6 Circle, the scanning voltage is -1.2 to 0.2V, and the scanning rate is 5mv / s, nickel-cobalt hydrogen phosphate is electrodeposited on the surface of nickel-cobalt ...

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Abstract

The invention provides a total phosphate electrode material and a preparation method thereof, and belongs to the technical field of supercapacitor electrode materials. The method comprises the following steps: S1, growing flaky nickel cobalt phosphate on the surface of a substrate through a hydrothermal method to obtain the substrate loaded with the flaky nickel cobalt phosphate; and S2, by taking the substrate loaded with the flaky nickel cobalt phosphate as a working electrode, depositing hydrogen nickel cobalt phosphate on the surface of the flaky nickel cobalt phosphate through an electro-deposition method to obtain the total phosphate electrode material. Two different nickel-cobalt phosphate materials are compounded, a large number of deposition sites are provided on the basis of flaky nickel-cobalt phosphate, and then nickel-cobalt hydrogen phosphate with high conductivity and small internal resistance is compounded on the deposition sites, so that the toughness of the flaky nickel-cobalt phosphate is improved, and the volume expansion of the nickel-cobalt phosphate in the reaction process is limited; and therefore, the composite material disclosed by the invention simultaneously realizes high energy density, power density and rate capability.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrode materials, in particular to a full phosphate electrode material and a preparation method thereof. Background technique [0002] As a new type of chemical power source, supercapacitors have the advantages of high power density, high energy density, fast charge and discharge rate, high efficiency, long cycle life and wide operating temperature range. The fields of automobile, aerospace and national defense technology have huge market potential. received widespread attention. In a supercapacitor, the electrode material is the most critical component. The type and performance of the electrode material will directly affect the performance of the supercapacitor. Therefore, how to improve the performance of the electrode material has become a hot research topic today. [0003] In recent years, researchers have carried out a series of work around electrode materials. Transition metal o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/84
CPCH01G11/30H01G11/84
Inventor 朱光冯含芳王乐辰李华阳
Owner NINGBO NOTTINGHAM NEW MATERIALS INST CO LTD
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