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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AI-Extracted 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 s...
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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.

Application Domain

Alkaline accumulatorsCell electrodes +3

Technology Topic

Cobalt oxideElectrically conductive +6

Image

  • 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(3)
  • Comparison scheme(1)

Example Embodiment

[0022] Example 1:
[0023] (1) Six-water nitrate and dimethylimidazole of 1: 2.5 is a precursor, and the acid-treated hydrophilic carbon cloth is suspended in the aqueous solution of the precursor, so that the sheet-like cobalt-based organic skeleton (ZIF- 67) The in situ is evenly grown on the carbon cloth, and the reaction temperature is controlled at 20 ° C, the reaction time is controlled at 6 h, and the resulting material is dried under vacuum, and the specific structure see figure 1;
[0024] (2) Under argon protection, the material obtained by step (1) in the tube furnace is controlled, and the temperature rise rate is controlled at 1.5 ° C min. -1 The processing temperature is 500 ° C, the treatment time is controlled at 2 h, converting ZIF-67 into carbon coated cobalt nanoparticles, obtaining materials, specific structures see figure 2;
[0025] (3) Place the air path in the air path with commercial selenium, placed in a tubular furnace together with the material obtained by the step (2), a hydrogen-argon mixture of 5%, and the control temperature rise rate is 1 ° C min. -1 The selenization temperature is controlled at 380 ° C, the reaction time is controlled at 6h to obtain a sheet-shaped carbon that is loaded on the carbon cloth, and a high-performance alkaline zinc battery cathode material is obtained. image 3.
[0026] The scanning electron micrograph of the resulting material is like the steps of the present embodiment (1) - (3) Figure 1-3 As shown, it indicates that the initial ZiF-67 sheet structure is evenly distributed on carbon fibers, after carbonization, selenization treatment, and the sheet structure is still radiated in carbon fiber.

Example Embodiment

[0027] Example 2:
[0028] (1) Six-water nitrate and dimethylimidazole of 1: 3.5 is preserved, and the acid-treated hydrophilic carbon cloth is suspended in the precursor aqueous solution, so that the sheet-like cobalt-based organic skeleton (ZIF- 67) The in situ is evenly grown on the carbon cloth, and the reaction temperature is controlled at 15 ° C, the reaction time is controlled at 10 h, and the resulting material is dried under vacuum;
[0029] (2) Under argon protection, the material obtained from the step (1) in the tube furnace is heat-treated, and the temperature control speed is controlled at 5 ° C min. -1 The treatment temperature is 600 ° C, the treatment time is controlled at 5 h, and ZIF-67 is converted into carbon coated cobalt nanoparticles;
[0030] (3) Place up the gas path in the air path in commercial selenium, placed in the tubular furnace together with the step (2), and the hydrogen-argon mixture of 8% is 8%, the control temperature rise rate is 3 ° C min Min. -1 The selenization temperature is controlled at 400 ° C, and the reaction time is controlled at 2 h to obtain a sheet-shaped carbon that is loaded on the carbon cloth, and a high-performance alkaline zinc battery cathode material is obtained.
[0031]The high performance basic zinc battery cathode material obtained in this example can be stably circulated more than 8,000 times, and the average single-torn capacity attenuation rate is 0.025%.

Example Embodiment

[0032] Example 3:
[0033] (1) Six-water nitrate and dimethylimidazole is a precursor with a mass ratio of 1: 2, and the acid-treated hydrophilic carbon cloth is suspended in the precursor aqueous solution, so that the sheet-like cobalt-based organic skeleton (ZIF- 67) The original position is evenly grown on the carbon cloth, and the reaction temperature is controlled at 30 ° C, the reaction time is controlled at 4 h, and the resulting material is dried under vacuum;
[0034] (2) Under argon protection, the material obtained in the tube furnace is heat-treated in the tubular furnace, and the temperature rise rate is controlled at 1 ° C min. -1 The processing temperature is 400 ° C, the treatment time is controlled at 1 h, and the ZIF-67 is converted to carbon coated cobalt-granular particles;
[0035] (3) Place the commercial selenium powder on the upstream of the gas path, put into the tube furnace together with the step (2), a hydrogen-argon mixture of 2% by the hydrogen gas, the control temperature rise rate is 0.5 ° C min MIN -1 The selenization temperature is controlled at 300 ° C, and the reaction time is controlled at 6 h to obtain a sheet-shaped carbon that is loaded on the carbon cloth.
[0036] The high performance basic zinc battery cathode material obtained in this example can be stably cycled to more than 7,500 times, and the average single-torn capacity attenuation rate is 0.032%.
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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • High area specific capacity
  • Improve cycle stability
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