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Gel electrolyte for aqueous zinc-manganese battery and preparation method of gel electrolyte

A technology of gel electrolyte and gel layer, applied in electrolytes, electrolyte immobilization/gelation, secondary batteries, etc., can solve the problems of poor reversibility of manganese-dissolved batteries, etc., to prevent the growth of zinc dendrites and prevent Corrosion, the effect of reducing production costs

Pending Publication Date: 2022-01-07
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a gel electrolyte for water-based zinc-manganese batteries and its preparation method to solve the problems of manganese dissolution and battery reversibility deterioration in water-based zinc-manganese batteries

Method used

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  • Gel electrolyte for aqueous zinc-manganese battery and preparation method of gel electrolyte
  • Gel electrolyte for aqueous zinc-manganese battery and preparation method of gel electrolyte
  • Gel electrolyte for aqueous zinc-manganese battery and preparation method of gel electrolyte

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Embodiment 1

[0029] A three-layer gel electrolyte, the preparation method specifically includes the following steps:

[0030] (1) Preparation of acidic polyacrylamide (PAM) gel layer

[0031] Add 0.25mg / L acrylamide (AM) to 2M ZnSO 4 and 0.05M H 2 SO 4 In the mixed solution, stir well until the acrylamide is completely dissolved, then add a small amount of 75g / L ammonium persulfate (APS) and 25g / L N,N'-methylenebisacrylamide (MBA) in order to promote gelation Stir at room temperature for 30 minutes, inject the mixed solution into a special mold with a thickness of 1.5mm, and then move the mold into a drying oven at 50°C for thermal initiation for 2 hours to obtain an acidic polyacrylamide gel layer;

[0032] (2) Preparation of slightly alkaline sodium polyacrylate gel layer

[0033] The mass fraction is 35% sodium acrylate, 75g / L APS, 25g / L MBA and 2M ZnSO 4 Mix the solutions, stir evenly, transfer the obtained mixed solution to a special mold with a thickness of 1.5mm in step (1), an...

Embodiment 2

[0037] An aqueous zinc-manganese battery, the preparation method specifically comprising the following steps:

[0038] (1) Cut the three-layer gel electrolyte prepared in Example 1 into discs with a diameter of 16 mm;

[0039] (2) cutting a titanium sheet with a diameter of 12mm, and coating the α-type manganese oxide active material on the titanium sheet as a positive electrode; cutting a zinc sheet with a diameter of 12mm as a negative electrode;

[0040](3) Use the three-layer gel electrolyte disc prepared in step (1) as the electrolyte / diaphragm to separate the positive and negative electrodes, and package it into a button battery.

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Abstract

The invention provides a gel electrolyte for an aqueous zinc-manganese battery and a preparation method of the gel electrolyte. The gel electrolyte at least sequentially comprises an acidic gel layer, an alkalescence gel layer and a neutral gel layer from bottom to top. When the gel electrolyte is applied to the assembly of the water-based zinc-manganese battery, the acidic gel layer is positioned at one side of a manganese dioxide positive electrode, and sufficient hydrogen ions can be provided to prevent the manganese dioxide from being dissolved; the neutral gel layer is located at one side of the zinc negative electrode, does not cause acid corrosion to the zinc negative electrode, and can effectively prevent zinc dendrite growth caused by alkalinity; and the alkalescence gel layer is positioned between the acidic gel layer and the neutral gel layer, so that hydrogen ions can be prevented from being migrated to the negative electrode from the positive electrode, and the corrosion of the zinc negative electrode is prevented. The structure and performance of the battery are stabilized, the service life of the battery is prolonged, meanwhile, the water-based zinc-manganese battery has better capacity, reversibility, flexibility and bendability, and the gel electrolyte has very good industrial application prospects in the field of new energy batteries.

Description

technical field [0001] The invention relates to the technical field of water-based zinc-manganese batteries, in particular to a gel electrolyte for water-based zinc-manganese batteries and a preparation method thereof. Background technique [0002] Flexible and bendable electronics are at the heart of the next generation of wearable devices, which can be integrated directly into the user's skin, clothing or portable accessories. The potential demand for such electronic products in national security, smart cities, personal health, etc. is huge, so it has received extensive attention in recent years. In particular, flexible zinc-ion batteries, mainly based on aqueous zinc-manganese batteries, have attracted much attention from scholars due to their safety, environmental friendliness, and flexibility. Although aqueous zinc-manganese batteries have the above advantages, the development of aqueous zinc-manganese batteries is inevitably limited due to problems such as electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38
CPCH01M10/38H01M2300/0085H01M2300/0094Y02E60/10Y02P70/50
Inventor 洪果沈照熙
Owner UNIVERSITY OF MACAU
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