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A kind of mxene/nickel phosphate electrode material and its preparation method and application

An electrode material, nickel phosphate technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of low specific capacity, stability or specific capacitance difference, specific capacitance and stability improvement, etc.

Active Publication Date: 2022-06-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is difficult to achieve complete exchange of MOFs ligand ions, so both stability and specific capacitance are not satisfactory (Z.Xiao, Y.Bao, Z.Li, X.Huai, M.Wang, P.Liu, L. Wang, ACS Appl. Energy Mater. 2019, 2, 1086.)
Third: Anchor nickel phosphate on the surface of graphene sheets to obtain a composite material of graphene and nickel phosphate. Compared with pure nickel phosphate, the material has a -1 The current density exhibited 48mAh g -1 The specific capacitance and the stability far superior to ordinary nickel phosphate, after 2000 cycles, the capacity can still maintain 92% of the initial capacity, but due to the limited functional groups on the surface of graphene, it is difficult to form a stable bond between nickel phosphate and graphene. Chemical bonds, resulting in low specific capacity, electrochemical performance is still unsatisfactory (A.A.Mirghni, M.J.Madito, K.O.Oyedotun, T.M.Masikhwa, N.M.Ndiaye, S.J.Ray, N.Manyala, RSCAdv.2018, 8, 11608.)
[0005] It can be seen that although there have been many schemes to optimize the electrochemical performance and stability of nickel phosphate electrode materials, none of the above-mentioned methods can simultaneously improve the conductivity, specific capacitance and stability of nickel phosphate.

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  • A kind of mxene/nickel phosphate electrode material and its preparation method and application
  • A kind of mxene/nickel phosphate electrode material and its preparation method and application
  • A kind of mxene/nickel phosphate electrode material and its preparation method and application

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[0047] The present invention also provides the preparation method of the MXene / nickel phosphate electrode material described in the above technical solution, comprising the following steps:

[0048] (1) mixing the MAX phase material with metal fluoride salt and hydrochloric acid for a first etching reaction to obtain an intermediate; mixing the intermediate with hydrofluoric acid for a second etching reaction to obtain an MXene nanosheet;

[0049] (2) mixing nickel nitrate hexahydrate, terephthalic acid, an organic solvent and the MXene nanosheet obtained in the step (1), and performing a solvothermal reaction to obtain MXene-MOF;

[0050] (3) mixing the MXene-MOF obtained in the step (2) with a potassium dihydrogen phosphate solution, and performing an ion exchange reaction to obtain an MXene / nickel phosphate electrode material.

[0051] In the present invention, the MAX phase material is mixed with the metal fluoride salt and hydrochloric acid to carry out the first etching ...

Embodiment 1

[0093] (1) 3g Ti 2 AlC 3 Mixed with 1.98g LiF and 50mL concentrated hydrochloric acid with a concentration of 4mol / L, the first etching reaction was carried out under stirring at 40 ° C for 24h, and the intermediate was obtained by washing and centrifuging with deionized water; the mass fraction of the intermediate and 50mL was 45% hydrofluoric acid was mixed and kept stirring at 50°C for 24 hours to carry out the second etching reaction. Then, deionized water and absolute ethanol were used to wash and centrifuge to obtain a black precipitate, and MXene nanosheets were obtained after lyophilization for 12 hours. Among them, MAX phase material (Ti 2 AlC 3 ), the mass ratio of metal fluoride (LiF) and hydrochloric acid is 3:1.98:50, Ti 2 AlC 3 The mass ratio to LiF is 1:0.66.

[0094] (2) Mix 0.5 g of nickel nitrate hexahydrate, 0.15 g of terephthalic acid and 150 mL of DMF to obtain a transparent solution, and then disperse 0.05 g of the MXene nanosheets prepared in step (...

Embodiment 2

[0112] (1) Put 2.5g V 2 AlC with 1.5g NH 4 F was mixed with 40 mL of concentrated hydrochloric acid with a concentration of 4 mol / L, and the first etching reaction was carried out under stirring at 40 °C for 24 h. The intermediate was obtained by washing and centrifuging with deionized water; the intermediate was mixed with 40 mL of 35% Mix with hydrofluoric acid, keep stirring at 40°C for 32h, carry out the second etching reaction, then use deionized water and absolute ethanol to wash and centrifuge to obtain black precipitate, and freeze-dry for 15h to obtain MXene nanosheets. Among them, MAX phase material (V 2 AlC), metal fluoride salts (NH 4 The mass ratio of F) and hydrochloric acid is 2.5:1.5:40, V 2 AlC and NH 4 The mass ratio of F is 5:3.

[0113] (2) Mix 0.5 g of nickel nitrate hexahydrate, 0.2 g of terephthalic acid and 250 mL of DMF to obtain a transparent solution, and then disperse 0.05 g of the MXene nanosheets prepared in step (1) in the transparent soluti...

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Abstract

The invention relates to the technical field of electrode materials, and provides a MXene / nickel phosphate electrode material and its preparation method and application. The MXene / nickel phosphate electrode material provided by the invention includes MXene sheets and nickel phosphate balls, and the nickel phosphate ball anchors Oriented on the surface of MXene nanosheets and intercalated between MXene nanosheets. The MXene / nickel phosphate electrode material nickel phosphate provided by the invention is anchored on the surface of MXene nanosheets, which reduces the interfacial transfer resistance between composite materials and improves the conductivity of composite materials; the intercalation of nickel phosphate grows between MXene sheets It widens the interlayer spacing of MXene sheets and becomes its interlayer pillar, which enhances the structural stability of the material while promoting ion migration, and exhibits excellent electrochemical performance of large specific capacitance, high stability, and high conductivity.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to an MXene / nickel phosphate electrode material and a preparation method and application thereof. Background technique [0002] The demand for portable electronic devices and the uneven spatial and temporal distribution of new energy power generation pose great challenges to the development and innovation of energy storage devices. Among many energy storage devices, supercapacitors are expected to meet the above challenges due to their safety and stability, fast charging, and wide power density range, and become the next-generation mainstream energy storage devices. However, the relatively poor stability and energy density of supercapacitors are the key factors restricting their practical production applications. [0003] Transition metal phosphates have the characteristics of high theoretical specific capacitance, abundant reserves, environmental and biological friendl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/30H01G11/86
CPCH01G11/24H01G11/26H01G11/30H01G11/86
Inventor 徐奔张昊兵梅豪孙道峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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