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a ni 3 the s 2 /mno composite material and its preparation method and application in aqueous alkaline battery

A composite material and electrodeposition technology, which is applied in the field of electrochemistry, can solve the problems that the electrochemical performance cannot be compared with carbon materials and metal conductors, the cathode materials of water-based alkaline batteries are less, and the composite materials are unstable, etc., and achieve good cycle stability. properties, reducing the rate of oxygen evolution, and the effect of excellent rate performance

Active Publication Date: 2021-07-23
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 ni <sub>3</sub> the s <sub>2</sub> /mno composite material and its preparation method and application in aqueous alkaline battery
  • a ni <sub>3</sub> the s <sub>2</sub> /mno composite material and its preparation method and application in aqueous alkaline battery
  • a ni <sub>3</sub> the s <sub>2</sub> /mno composite material and its preparation method and application in aqueous alkaline battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Ni 3 S 2 The preparation method of / MnO composite material comprises steps as follows:

[0043] 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 60 minutes 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 .

[0044] 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 ...

Embodiment 2

[0060] Ni as described in Example 1 3 S 2 / MnO composite preparation method, the difference is:

[0061] 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 .

[0062] 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

[0064] Ni as described in Example 1 3 S 2 / MnO composite preparation method, the difference is:

[0065] 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 .

[0066] 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 present invention relates to a kind of Ni 3 S 2 / MnO composite material and preparation method thereof and application in aqueous alkaline battery, described Ni 3 S 2 / MnO composite is carbon paper loaded with Ni 3 S 2 / MnO active material, Ni 3 S 2 The shape of the / MnO active material is cauliflower-shaped, and the loading capacity of the active material is 1.5-8mgcm ‑2 . Through a simple electrodeposition method, the precursor was generated on carbon paper in one step, and then calcined to obtain the final product Ni 3 S 2 / MnO complex. The obtained composite material has a large specific surface area, which promotes the rate performance and cycle stability of the material. In the application test of aqueous alkaline battery, Ni 3 S 2 / MnO composite exhibits excellent rate capability at 15A g ‑1 30mAh g at current density ‑1 The mass specific capacity; in the long cycle charge and discharge test process showed good cycle stability, at 2A g ‑1 After charging and discharging 450 times at the current density, the specific capacity can still maintain 85.1mAh g ‑1 , which is equivalent to 97.5% of the initial specific capacity, and a nearly 100% Coulombic efficiency is maintained throughout the 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 Patents(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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