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A Ni3S2/MnO composite material, a preparation method thereof and an application thereof in an aqueous alkaline battery

A composite material and electrodeposition technology, which is applied in the field of electrochemistry, can solve the problems of less positive electrode materials, low electrochemical performance, and complicated composite methods in aqueous alkaline batteries, and achieve good cycle stability, excellent rate performance, and increased potential sexual effect

Active Publication Date: 2018-12-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently Ni 3 S 2 There are many studies on supercapacitors, but there are very few reports as positive electrode materials for aqueous alkaline batteries.
Although Ni 3 S 2 The conductivity of the material is good, but the electrochemical performance of the material cannot be compared with carbon materials and metal conductors. At present, it is usually combined with materials with high conductivity such as carbon materials and nickel foam; or by constructing a special morphology and other means to further improve the Ni 3 S 2 electrochemical performance
(See ElectrochimicaActa 2017,251,235; Adv.Energy Mater.2017,7,1700983; J.Mater.Chem.A 2015,3,16150), although the electrochemical performance can be improved to a certain extent through recombination energy, the electrochemical performance is still Not high, and the current composite method is complicated, and the obtained composite material is unstable

Method used

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  • A Ni3S2/MnO composite material, a preparation method thereof and an application thereof in an aqueous alkaline battery
  • A Ni3S2/MnO composite material, a preparation method thereof and an application thereof in an aqueous alkaline battery
  • A Ni3S2/MnO composite material, a preparation method thereof and an application thereof in an aqueous alkaline battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Ni 3 S 2 The preparation method of / MnO composite material comprises steps as follows:

[0042] NiCl 2 , MnCl 2 The mixed solution with thiourea is the electrolyte, and the NiCl in the mixed solution 2 The concentration is 7.5mmolL -1 , MnCl 2 The concentration is 5mmol L -1 , the concentration of thiourea is 0.5mol L -1 , carbon paper was electrodeposited at a constant potential of -0.85V for 60min to electrodeposit active substances on the surface of the carbon paper. After washing and drying, a precursor product was obtained, and then calcined at 400°C for 2 hours in an Ar atmosphere to obtain Ni 3 S 2 / MnO composite (S1). The mass of active material on carbon paper is 4 mg cm- 2 .

[0043] Ni produced 3 S 2 / MnO composite material (S1) XRD pattern and scanning electron microscope such as figure 1 , figure 2 shown by figure 2 It can be seen that the morphology of the material presents a granular combined cauliflower shape and is densely coated on the...

Embodiment 2

[0059] Ni as described in Example 1 3 S 2 / MnO composite preparation method, the difference is:

[0060] NiCl in mixed solution 2 The concentration is 2.5mmol L -1 , MnCl 2 The concentration is 7.5mmol L -1 , the concentration of thiourea is 0.5mol L -1 , the electrodeposition time is 30min, and the high-temperature calcination time is 1 hour to obtain Ni 3 S 2 / MnO composites with an active material mass of 1.5 mg cm on carbon paper -2 .

[0061] The morphology of the material presents the shape of granular combined cauliflower and is densely covered on the surface of carbon fiber. XRD test has carbon paper, Ni 3 S 2 And three different characteristic peaks of MnO, elemental mapping can be observed Mn element.

Embodiment 3

[0063] Ni as described in Example 1 3 S 2 / MnO composite preparation method, the difference is:

[0064] NiCl in mixed solution 2 The concentration is 15mmol L -1 , MnCl 2 The concentration is 10mmol L -1 , the concentration of thiourea is 1mol L -1 , the electrodeposition time is 120min, and the high-temperature calcination time is 3 hours to obtain Ni 3 S 2 / MnO composites with an active mass of 8 mg cm on carbon paper -2 .

[0065] The morphology of the material presents the shape of granular combined cauliflower and is densely covered on the surface of carbon fiber. XRD test has carbon paper, Ni 3 S 2 And three different characteristic peaks of MnO, elemental mapping can be observed Mn element.

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Abstract

The invention relates to a Ni3S2 / MnO composite material, a preparation method thereof and an application thereof in an aqueous alkaline battery, The Ni3S2 / MnO composite is a Ni3S2 / MnO active materialloaded on carbon paper, the Ni3S2 / MnO active material is shaped like broccoli, and the loading amount of the active material is 1.5-8mgcm <2>. The precursor was synthesized on carbon paper by a simpleelectrodeposition method, and the final product Ni3S2 / MnO composite was obtained after calcination. The specific surface area of the composites is large, which promotes the rate performance and cyclestability of the composites. Ni3S2 / MnO composites exhibit excellent rate performance in aqueous alkaline batteries. The electrochemical properties of Ni3S2 / MnO composites are tested in the range of 15Ag-1. There is still 30mAh / g at the current density of 1-1; The results show that the cycle stability is good in the long cycle charge-discharge test, and the cycle stability is good in the range of2A g-1. The specific capacitance of 85.1 mAh g-1, corresponding to 97.5% of the initial specific capacity, and the Coulomb efficiency was maintained at nearly 100% throughout the whole process.

Description

Technical field: [0001] The present invention relates to a kind of Ni 3 S 2 The invention relates to a / MnO composite material, a preparation method thereof, and an application in an aqueous alkaline battery, belonging to the technical field of electrochemistry. Background technique: [0002] Due to its large capacity and high efficiency, lithium-ion batteries have greatly improved people's quality of life and brought many conveniences. Followed by more and more news of battery explosion and burning, people began to worry and question the safety of lithium-ion batteries. Flammable and explosive electrolytes, harsh assembly conditions and high raw material prices have forced people to turn their attention to other types of energy storage devices. Aqueous batteries use aqueous solutions to replace the widely used organic electrolytes. Aqueous batteries have the advantages of low cost and high safety performance, and can effectively solve the above problems. Due to the bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/48H01M4/505H01M10/36
CPCH01M4/366H01M4/48H01M4/505H01M4/5815H01M10/36Y02E60/10
Inventor 杨剑张隽殊张大鹏
Owner SHANDONG UNIV
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