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High-performance alkaline zinc battery cathode material and preparation method thereof

A cathode material, zinc battery technology, applied in the direction of alkaline storage battery, battery electrode, carbon preparation/purification, etc., can solve the problems of poor controllability, tedious time-consuming, not enough environmental protection, etc., to achieve mild and controllable reaction, The effect of low production cost and high area specific capacity

Pending Publication Date: 2021-08-20
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is cumbersome and time-consuming, difficult to operate, and poor in controllability, and the cycle can be increased to about 6000 cycles at most
2. By introducing oxygen vacancies or surface phosphate ion modification to the spinel double metal oxide, the capacity is significantly improved, and the cycle stability is above 3000 cycles, but the decomposition of the dihydrogen phosphate used in the modification process is easy to produce highly toxic Phosphine gas, not environmentally friendly
Therefore, it is still challenging to develop highly reversible alkaline zinc storage cathode materials with good cycle stability.

Method used

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  • High-performance alkaline zinc battery cathode material and preparation method thereof
  • High-performance alkaline zinc battery cathode material and preparation method thereof
  • High-performance alkaline zinc battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Using cobalt nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:2.5 as the precursor, the acid-treated hydrophilic carbon cloth was suspended in the aqueous solution of the precursor, and the sheet-like cobalt-based metal-organic framework (ZIF- 67) Uniformly grow on the carbon cloth in situ, the reaction temperature is controlled at 20°C, the reaction time is controlled at 6h, and the resulting material is dried under vacuum. For the specific structure, see figure 1 ;

[0024] (2) Under the protection of argon, the material obtained in step (1) was heat-treated in a tube furnace, and the heating rate was controlled at 1.5°C min -1 , the treatment temperature is 500°C, the treatment time is controlled at 2h, ZIF-67 is converted into carbon-coated cobalt nanoparticles, and the material is obtained. For the specific structure, see figure 2 ;

[0025] (3) Place the commercial selenium powder on the upstream of the gas path, put it into the tube furnace...

Embodiment 2

[0028] (1) Using cobalt nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:3.5 as the precursor, the acid-treated hydrophilic carbon cloth was suspended in the aqueous solution of the precursor, and the sheet-like cobalt-based metal-organic framework (ZIF- 67) In-situ uniform growth on the carbon cloth, the reaction temperature is controlled at 15°C, the reaction time is controlled at 10h, and the obtained material is dried under vacuum;

[0029] (2) Under the protection of argon, the material obtained in step (1) was heat-treated in a tube furnace, and the heating rate was controlled at 5°C min -1 , the treatment temperature is 600°C, the treatment time is controlled at 5h, and the ZIF-67 is converted into carbon-coated cobalt nanoparticles;

[0030] (3) Place the commercial selenium powder on the upstream of the gas path, put it into the tube furnace together with the material obtained in step (2), and pass a hydrogen-argon gas mixture with a hydrogen content o...

Embodiment 3

[0033] (1) Using cobalt nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:2 as the precursor, the acid-treated hydrophilic carbon cloth was suspended in the aqueous solution of the precursor, and the sheet-like cobalt-based metal-organic framework (ZIF- 67) In-situ uniform growth on the carbon cloth, the reaction temperature is controlled at 30°C, the reaction time is controlled at 4h, and the obtained material is dried under vacuum;

[0034] (2) Under the protection of argon, the material obtained in step (1) was heat-treated in a tube furnace, and the heating rate was controlled at 1°C min -1 , the treatment temperature is 400°C, the treatment time is controlled at 1h, and the ZIF-67 is converted into carbon-coated cobalt nanoparticles;

[0035] (3) Place the commercialized selenium powder on the upstream of the gas path, put it into the tube furnace together with the material obtained in step (2), and pass a hydrogen-argon gas mixture with a hydrogen content ...

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Abstract

The invention discloses a high-performance alkaline zinc battery cathode material and a preparation method thereof. The high-performance alkaline zinc battery cathode material can be directly used as a flexible alkaline zinc battery cathode, conversion from cobalt diselenide to selenium-doped cobalt oxide is achieved by means of an initial electrochemical cycle process, depending on the maintaining effect of selenium doping on the content of high-valence cobalt in the cobalt oxide, high area specific capacity and long cycle stability superior to those of conventional cobalt oxide are obtained, the service life reaches 10000 times or above, and the zinc-storage cathode material is far superior to most of current zinc-storage cathode materials. The preparation method provided by the invention is simple and easy to implement, green and environment-friendly, mild and controllable in reaction, low in requirements on equipment conditions and relatively low in production cost, and the obtained high-performance alkaline zinc battery cathode material is flexible and self-supported, does not need to be added with a conductive additive and a binder, and can be prepared in a large scale, so that the preparation method has important practical value.

Description

technical field [0001] The invention belongs to the technical field of zinc battery cathode materials, and in particular relates to a high-performance alkaline zinc battery cathode material and a preparation method thereof. Background technique [0002] The development of human society is inseparable from energy. Traditional fossil energy reserves are limited, and its extensive use has led to serious environmental pollution. Extreme environmental problems such as the greenhouse effect and smog are becoming more and more serious. It has become a general consensus to obtain wind energy, tidal energy, biomass, solar energy and other renewable energy sources from nature and connect them to the grid for power generation, and vigorously develop new and efficient clean energy utilization technologies. Alkaline aqueous zinc batteries are characterized by cleanliness, high efficiency, green safety, and low cost. It also has broad application prospects in the fields of automobiles, ...

Claims

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Application Information

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IPC IPC(8): C01B19/04C01B32/05H01M4/58H01M4/62H01M10/24
CPCC01B19/007C01B32/05H01M4/581H01M4/625H01M10/24C01P2004/80C01P2002/72C01P2004/60C01P2004/03Y02E60/10
Inventor 支春义唐永超李洪飞唐子杰林龙霞
Owner SONGSHAN LAKE MATERIALS LAB
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