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Phosphorus-doped heterogeneous nickel-cobalt sulfide composite material and preparation method and application thereof

A nickel-cobalt sulfide and composite material technology, applied in the field of materials, can solve the volume expansion of transition metal sulfide electrode materials, limit the wide application of supercapacitors, and capacity fading.

Pending Publication Date: 2021-05-18
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the long-term charge-discharge process, transition metal sulfide electrode materials are prone to severe volume expansion, which leads to a decrease in reaction rate, capacity fading, and cycle stability, which severely limits their wide application in the field of supercapacitors.

Method used

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  • Phosphorus-doped heterogeneous nickel-cobalt sulfide composite material and preparation method and application thereof
  • Phosphorus-doped heterogeneous nickel-cobalt sulfide composite material and preparation method and application thereof
  • Phosphorus-doped heterogeneous nickel-cobalt sulfide composite material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0057] (1) A preparation method of a phosphorus-doped heterogeneous nickel-cobalt sulfide composite material, comprising the following steps:

[0058] 1) Dissolve 1.45g of cobalt nitrate and 1g of sodium lauryl sulfate in a mixed solution of 35mL of methanol and 5mL of water. After stirring into a pink homogeneous solution, soak a piece of nickel foam (3cm×5cm) that has been washed several times with acetone, hydrochloric acid, and ultrapure water into the above solution, and then transfer the mixed solution into 50mL polytetrafluoroethylene In the lining, heat to 180°C for 10 hours. After the reactor was naturally cooled to room temperature, the nickel foam was taken out, washed several times with absolute ethanol and ultrapure water, and then vacuum-dried at 80°C for 12 hours to obtain the nickel foam loaded with Co precursor;

[0059] 2) Transfer the nickel foam loaded with Co precursor obtained in step 1) to a muffle furnace, place it in an air atmosphere, raise the tempe...

Embodiment 2

[0073] (1) A preparation method of a phosphorus-doped heterogeneous nickel-cobalt sulfide composite material, comprising the following steps:

[0074] 1) operation is with the step 1) of embodiment 1;

[0075] 2) Transfer the nickel foam loaded with Co precursor obtained in step 1) to a muffle furnace, place it in an air atmosphere, raise the temperature to 400°C at a heating rate of 2°C / min, and keep it warm for 2h to obtain nano flower nickel foam;

[0076] 3) Immerse the nickel foam loaded with tricobalt tetroxide obtained in step 2) into 40 mL of absolute ethanol solution containing 0.63 g of nickel acetate tetrahydrate and 0.56 g of thioacetamide, and then transfer the material to a 50 mL autoclave at a constant temperature of 120 ° C. Reaction 2h. After cooling, wash the nickel foam several times with ultrapure water and ethanol, and finally dry it at 80°C for 12 hours to obtain heterogeneous nickel-cobalt sulfide nanocomposites;

[0077] 4) Place the product of step ...

Embodiment 3

[0085] (1) A preparation method of a phosphorus-doped heterogeneous nickel-cobalt sulfide composite material, comprising the following steps:

[0086] 1) operation is with the step 1) of embodiment 1;

[0087] 2) Transfer the nickel foam loaded with Co precursor obtained in step 1) to a muffle furnace, place it in an air atmosphere, raise the temperature to 400°C at a heating rate of 2°C / min, and keep it warm for 2h to obtain nano flower nickel foam;

[0088] 3) Immerse the nickel foam loaded with tricobalt tetroxide obtained in step 2) into 40 mL of absolute ethanol solution containing 0.63 g of nickel acetate tetrahydrate and 0.56 g of thioacetamide, and then transfer the material to a 50 mL autoclave at a constant temperature of 120 ° C. Reaction 2h. After cooling, wash the nickel foam several times with ultrapure water and ethanol, and finally dry it at 80°C for 12 hours to obtain heterogeneous nickel-cobalt sulfide nanocomposites;

[0089] 4) Put the product obtained i...

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Abstract

The invention discloses a phosphorus-doped heterogeneous nickel-cobalt sulfide composite material and a preparation method and application thereof. The preparation method comprises the following steps: placing foamed nickel in a methanol-water solution containing cobalt nitrate-surfactant, carrying out hydrothermal reaction, performing cooling, cleaning and drying after the reaction, and calcining the obtained foamed nickel for growing a cobalt precursor to obtain foamed nickel loaded with cobaltosic oxide; putting the foamed nickel into an ethanol solution containing nickel acetate and thioacetamide, carrying out a hydrothermal reaction, and performing cooling, cleaning and drying after the reaction to obtain a heterogeneous nickel-cobalt sulfide nano composite material; and then, putting the nickel-cobalt sulfide composite material at the downstream of an air flow, putting sodium hypophosphite at the upstream of the air flow, performing calcining in nitrogen, and naturally performing cooling to obtain the phosphorus-doped heterogeneous nickel-cobalt sulfide composite material. The material has excellent conductivity and excellent electrochemical performance, and shows excellent cycling stability and relatively high energy density when being applied to a supercapacitor as an active material.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a phosphorus-doped heterogeneous nickel-cobalt sulfide composite material and its preparation method and application. Background technique [0002] Supercapacitors are one of the important representatives of new energy storage devices. With the advantages of ultra-high power density, fast charge and discharge rate, excellent cycle performance and low maintenance cost, supercapacitors have become a bridge connecting batteries and electrical equipment. However, the practical application of supercapacitors is still hampered by the lack of high-performance electrode materials. Therefore, the design and development of new electrode materials with high specific capacity and excellent electrochemical stability has important practical significance for supercapacitors to replace traditional energy sources. [0003] Due to their high theoretical specific capacitance and fast redox reaction rate, ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/86
CPCH01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 邹汉波冯志伟彭卓陈江东杨伟陈胜洲
Owner GUANGZHOU UNIVERSITY
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