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A rechargeable zinc-manganese battery and a preparation method thereof

A zinc-manganese battery and battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting battery cycle stability and rate performance, the potential drop of positive manganese dioxide material rapidly, and adverse battery performance. The synthesis process is simple and feasible, the effect of increasing contact and stable structure

Inactive Publication Date: 2019-01-04
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the positive electrode active materials in the existing zinc-manganese batteries are manganese dioxide with an amorphous structure, which is not conducive to the performance of the battery
In addition, during the high-current discharge process, the potential of the positive manganese dioxide material drops rapidly, and the polarization phenomenon is serious, which greatly affects the cycle stability and rate performance of the battery.

Method used

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  • A rechargeable zinc-manganese battery and a preparation method thereof
  • A rechargeable zinc-manganese battery and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The positive electrode active material is prepared as follows: Weigh potassium permanganate and manganese sulfate hydrate with a molar ratio of 1:1, dissolve in 50ml deionized water, stir until completely dissolved, transfer to a hydrothermal kettle, then transfer to an oven, and heat up The rate is 5-10°C / min, the temperature is raised to 120-180°C, and kept for 4-12h, then naturally cooled to room temperature, the obtained material is washed several times and dried. Under the air atmosphere, calcine at high temperature for 1-4 hours, control the calcination temperature at 400-600° C., and control the heating rate at 5-8° C. / min. Synthesis of α-MnO by this method 2 The process is simple and feasible, the experiment reproducibility is good, and the raw materials used are cheap and easy to obtain. figure 1 In the prepared α-MnO 2 It can be seen that the material is in a uniform linear shape with a length between 0.5 and 3 μm. A uniform structure is more conducive to th...

Embodiment 2

[0062] Preparation of positive electrode active material: 2.0g manganese sulfate (MnSO 4 ·H 2 O) Dissolve in 15ml of deionized water, 12.5g of potassium permanganate is dissolved in 20ml of water; Slowly add manganese sulfate aqueous solution to potassium permanganate aqueous solution (about 30min) with an acid burette, obtain amorphous after magnetic stirring for 1h Manganese dioxide, washed several times with deionized water and alcohol, dried for later use.

[0063] The preparation process of the positive pole piece is as follows: Grind the obtained amorphous manganese dioxide for 30-60 minutes, add binder and conductive agent in proportion, continue grinding for 30 minutes, add a certain amount of solvent, grind evenly, and obtain a slightly fluid slurry material. Coat the slurry on stainless steel foil, dry it, and punch it into discs of uniform size for later use.

[0064] Negative electrode preparation: polish the high-purity zinc sheet with 200-grit sandpaper, then ...

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Abstract

The invention provides a rechargeable zinc-manganese battery and a preparation method thereof. A positive electrode adopts a linear alpha-MnO2 material to replace a traditional amorphous manganese dioxide material, and the linear alpha-MnO2 material has a uniform structure. The large tunnels and vacancies in MnO2 increase the contact between the active material and the electrode, reduce the internal resistance of the battery, and improve the diffusivity of protons. The larger aspect ratio of MnO2 can make the preferred orientation degree of the material higher, thus improving the rate performance of the battery. Stable structure, not easy to collapse, the activity can be maintained at a high level, the decay rate is slow, more conducive to the battery cycle performance. In accordance withthat present invention, the preparation method of the alpha-MnO2 material is simple and feasible, the experimental reproducibility is good, the raw materials used are cheap and easy to obtain, the linear alpha-MnO2 material has a uniform structure, large aspect ratio, and stable structure, and is not easy to collapse and slow in attenuation rate.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a rechargeable zinc-manganese battery based on an aqueous electrolyte. Background technique [0002] With the rapid development of the world economy, countries have increasingly higher requirements for energy. The development of new energy and environmentally friendly new energy materials are the work actively advocated by governments of all countries. The development of rechargeable secondary batteries has increasingly become the new darling of new energy technologies. At present, lithium-ion batteries play an important role in people's daily life and have been widely used in various portable devices. However, the production cost of lithium-ion batteries is relatively high, and there are certain safety hazards. Therefore, researchers are actively seeking safer and more reliable secondary batteries. [0003] Zinc-ion batteries are highly safe and low-co...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M10/36C01G45/02
CPCC01G45/02C01P2004/03C01P2006/40H01M4/50H01M10/36H01M2004/021H01M2004/028Y02E60/10
Inventor 李昭宇
Owner 桑顿新能源科技(长沙)有限公司
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