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ZnO@C negative electrode material for zinc-nickel battery and preparation method thereof

A technology of zinc-nickel battery and negative electrode material, applied in battery electrodes, nickel accumulators, carbon preparation/purification, etc., can solve the problems of small contact area, incomplete dendrite growth inhibition, etc., to improve mass transfer rate, excellent Electrochemical performance, the effect of improving utilization

Inactive Publication Date: 2021-06-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon coating materials currently used are directly introduced into the carbon source and coated on the surface of zinc oxide, the contact area between the carbon material and ZnO is relatively small, and the inhibition of dendrite growth is not complete.

Method used

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  • ZnO@C negative electrode material for zinc-nickel battery and preparation method thereof
  • ZnO@C negative electrode material for zinc-nickel battery and preparation method thereof
  • ZnO@C negative electrode material for zinc-nickel battery and preparation method thereof

Examples

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Embodiment 1

[0038] A method for preparing a ZnO@C negative electrode material for a zinc-nickel battery, comprising the following steps:

[0039] Step 1: Add 6 g of zinc acetate into 300 mL of diethylene glycol, heat in an oil bath at 170° C., stir and react for 30 min to obtain a reaction solution.

[0040] After the reaction solution was cooled to room temperature, centrifugal separation was carried out, and the product was repeatedly washed 3 times with absolute ethanol and deionized water, and dried under vacuum for 12 hours to obtain ZnO microspheres;

[0041] Step 2: Take 0.825g of 2-methylimidazole and 0.102g of the above-prepared ZnO pellets, and sequentially add them to the N,N-dimethylformamide (DMF) / H 2 The mixed solution of O (80mL, the volume ratio of the two is DMF:H 2 O=3:1), and fully stirred to obtain a mixed liquid. The above mixed liquid was transferred to a hydrothermal reaction kettle (volume 100mL), and the hydrothermal reaction was carried out at 70°C for 24 hours...

Embodiment 2

[0052] A method for preparing a ZnO@C negative electrode material for a zinc-nickel battery, comprising the following steps:

[0053] Step 1: Add 5 g of zinc acetate into 300 mL of diethylene glycol, heat in an oil bath at 180° C., and stir for 40 minutes to obtain a reaction solution.

[0054] After the reaction solution was cooled to room temperature, centrifugation was carried out, and the product was repeatedly washed 3 times with absolute ethanol and deionized water, and dried under vacuum for 11 hours to obtain ZnO microspheres;

[0055] Step 2: Take 0.7425g of 2-methylimidazole and 0.102g of the above-prepared ZnO pellets, and sequentially add them to the N,N-dimethylformamide (DMF) / H 2 The mixed solution of O (60mL, the volume ratio of the two is DMF:H 2 O=2:1), and fully stirred to obtain a mixed liquid.

[0056] The above mixed liquid was transferred to a hydrothermal reaction kettle (volume 100mL), and the hydrothermal reaction was carried out at 60°C for 20h. Aft...

Embodiment 3

[0061] A method for preparing a ZnO@C negative electrode material for a zinc-nickel battery, comprising the following steps:

[0062] Step 1: Add 5 g of zinc acetate into 200 mL of diethylene glycol, heat in an oil bath at 160° C., stir and react for 20 min to obtain a reaction solution.

[0063] After the reaction solution was cooled to room temperature, centrifugation was carried out, and the product was repeatedly washed twice with absolute ethanol and deionized water, and dried under vacuum for 10 hours to obtain ZnO microspheres;

[0064] Step 2: Take 0.66g of 2-methylimidazole and 0.102g of the above-prepared ZnO pellets, and sequentially add them to the N,N-dimethylformamide (DMF) / H 2 The mixed solution of O (80mL, the volume ratio of the two is DMF:H 2 O=1:1), and fully stirred to obtain a mixed liquid. The above mixed liquid was transferred to a hydrothermal reaction kettle (volume 100mL), and the hydrothermal reaction was carried out at 80°C for 22 hours. After coo...

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Abstract

A ZnO@C C negative electrode material for a zinc-nickel battery and a preparation method thereof belongs to the field of alkaline secondary battery negative electrode materials. The preparation method of the ZnO@C negative electrode material for the zinc-nickel battery comprises the following steps of: preparing nano ZnO microspheres by adopting a hydrothermal method, taking the nano ZnO microspheres as a zinc source, growing ZIF-8 on the surfaces of the nano ZnO microspheres in situ to prepare a ZnO@ZIF-8 core-shell nano composite material with a ZIF-8 coated core-shell structure, and performing argon carbonization and air carbonization to form a ZIF-8 derived carbon coated ZnO nano composite material (ZnO@C). When the material is used for a zinc-nickel battery negative electrode, the core-shell structure can increase the contact area between an active substance and an electrolyte and improve the conductivity of an electrode material, the porous carbon coating the surface of ZnO can inhibit dissolution of ZnO in alkaline electrolyte, more zinc deposition sites are provided, dendritic crystals and deformation of a zinc negative electrode are effectively slowed down, and the cycle performance of the zinc-nickel battery is excellent.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for alkaline secondary batteries, and in particular relates to a ZnO@C negative electrode material for zinc-nickel batteries and a preparation method thereof. Background technique [0002] With the depletion of fossil fuels such as coal and petroleum, the development of new environmentally friendly renewable energy has become a global trend. The secondary battery energy storage system has received extensive attention from researchers. The common secondary battery systems mainly include lithium-ion batteries, lead-acid batteries, and nickel-metal hydride batteries for chemical energy storage, as well as supercapacitors and ultracapacitors for electromagnetic energy storage. Conductive magnetism, etc. However, most of the existing secondary battery systems have obvious limitations, such as: lead-acid batteries have low specific energy density and environmental pollution; nickel...

Claims

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Application Information

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IPC IPC(8): C01G9/02C01B32/05H01M4/36H01M4/48H01M4/62H01M10/30
CPCC01G9/02C01B32/05H01M4/366H01M4/48H01M4/625H01M4/628H01M10/30H01M2004/021H01M2004/027C01P2004/80C01P2004/62C01P2006/12C01P2006/14C01P2006/40C01P2002/72C01P2004/03C01P2006/17Y02E60/10
Inventor 胡宪伟王晓丽李卓陈鹏李博石忠宁王兆文
Owner NORTHEASTERN UNIV
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