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Preparation method of CoFe-S-coated 3D-S-NCNT electrode and quasi-solid-state zinc-air battery

A cofe-s, 1. cofe-s technology, applied in electrical components, battery electrodes, fuel cell half-cells and secondary battery half-cells, etc., to achieve high power density, high bifunctional activity, synthetic The effect of simple process

Pending Publication Date: 2022-06-10
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of powder air electrode materials with high bifunctional activity, high power density, and excellent stability by this facile method for quasi-solid-state Zn-air batteries has not been reported yet.

Method used

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  • Preparation method of CoFe-S-coated 3D-S-NCNT electrode and quasi-solid-state zinc-air battery
  • Preparation method of CoFe-S-coated 3D-S-NCNT electrode and quasi-solid-state zinc-air battery
  • Preparation method of CoFe-S-coated 3D-S-NCNT electrode and quasi-solid-state zinc-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The hydrophobicity of the prepared CoFe-S@3D-S-NCNT micro-nano composite material was tested, and the carbon paper loaded with CoFe-S@3D-S-NCNT micro-nano composite material was directly tested, such as Figure 6 As shown, it can be seen that its hydrophobic angle has 151°, which proves that the hydrophobicity of the CoFe-S@3D-S-NCNT micro-nanocomposite material is excellent, and the material with better hydrophobicity has an advantage in the discharge polarization, because Discharge polarization requires a large amount of oxygen to make the reaction go forward.

[0045] The ORR performance test of the prepared CoFe-S@3D-S-NCNT micro-nano composite material, such as Figure 7 As shown, it can be seen that it has a higher half-wave potential of 0.855V, which is close to 6mA / cm 2 The limiting current density shows that it has excellent ORR activity.

[0046] The OER performance test of the prepared CoFe-S@3D-S-NCNT micro-nano composite material, such as Figure 8 As sh...

Embodiment 2

[0065] (2) Preparation of CoFe@3D-NCNT

[0066] (3) Preparation of CoFe-S@3D-S-NCNT

[0067] Example 6

[0068] (2) Preparation of CoFe@3D-NCNT

[0069] (3) Preparation of CoFe-S@3D-S-NCNT

[0070] After the same experimental verification as in Example 1, the results show that when the material prepared in Example 2 is used for the preparation of an electrode for a rechargeable zinc-empty battery, its peak power density is at 360 mW / cm 2 , its cycle stability is more than 180 cycles; when the material prepared in Example 3 is used for the preparation of zinc-empty battery electrodes, its peak power density is 380 mW / cm 2 , its cycle stability is more than 150 cycles; when the material prepared in Example 4 is used for the preparation of zinc-empty battery electrodes, its peak power density is 240 mW / cm 2 , its cycle stability is more than 110 cycles; when the material prepared in Example 5 is used for the preparation of zinc-empty battery electrodes, its peak power density...

Embodiment 3

[0072] The prepared materials were tested for catalytic activity and discharge polarization. The ORR half-wave potential was 0.82V, the OER overpotential was 390mV, and the peak power density was 375 mW / cm 2 , the results show that the electrochemical performance of pure Co-MOF decreases after annealing and sulfidation.

[0073] Comparative example 2

With embodiment 1, the difference is that the calcining process in the step (2) does not introduce melamine as the carbon source and directly heats up to 800 °, and then the holding time is 1 hour.

[0074] The morphology, cycle stability, catalytic activity test and discharge polarization test of the prepared material showed that the ORR half-wave potential was 0.73V, the OER overpotential was 430mV, and the peak power density was 140 mW / cm 2 , and its cycle stability is 85 times. The results show that after calcination without introducing melamine as a carbon source, carbon nanotubes will not grow in situ on CoFe-MOF nanosheet...

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Abstract

The invention relates to a preparation method of a CoFe-S-coated 3D-S-NCNT electrode and a quasi-solid zinc-air battery. The invention relates to the technical field of chargeable and dischargeable quasi-solid-state zinc-air batteries, in particular to a preparation method of an electrode and a quasi-solid-state zinc-air battery comprising the electrode. The preparation method comprises the following steps: by taking cobalt salt, ferric salt and 2-methylimidazole as reaction raw materials, growing at room temperature to obtain a CoFe-MOF nanosheet, and then carrying out CVD (Chemical Vapor Deposition) annealing carbonization to obtain the CoFe-coated 3D-NCNT micro-nano material; and then carrying out hydrothermal reaction in a sodium sulfide solution to obtain the CoFe-S-3D-S-NCNT micro-nano composite material with a 3D micro-nano hierarchical structure, high catalytic activity and better hydrophobicity. The prepared CoFe-S-coated 3D-S-NCNT composite material is used as a cathode, and the cathode, a zinc anode and a quasi-solid electrolyte are assembled into the quasi-solid zinc-air battery with a sandwich structure. The battery has ideal charge-discharge performance, the open-circuit voltage is up to 1.479 V, the discharge peak power density is up to 460 mW / cm < 2 >, and the battery has excellent charge-discharge stability and can be circulated for more than 225 cycles.

Description

technical field [0001] The invention relates to the technical field of preparation of quasi-solid-state rechargeable zinc-air batteries, and the air cathode side specifically relates to the technical field of preparation of new energy materials. Background technique [0002] Quasi-solid-state zinc-air batteries have the advantages of high energy density, portability, small size, low cost, safety, and environmental protection, and have good application prospects. However, the low peak power density and poor stability of quasi-solid-state Zn-air batteries are still a great challenge for practical applications. Air electrodes, as the core components of quasi-solid-state zinc-air batteries, have an important impact on the energy storage density, discharge peak power density and cycle life of batteries. Therefore, the development of cathode electrocatalytic materials and air electrodes with high catalytic activity, high stability, and high reaction kinetics is of great significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/08
CPCH01M4/8657H01M4/8673H01M4/8825H01M12/08H01M4/9083Y02E60/10
Inventor 孙小华赵大福刘秋恒孙盼盼吕小伟
Owner CHINA THREE GORGES UNIV
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