Aqueous electrolyte for improving reversibility of neutral zinc-manganese battery and preparation method of aqueous electrolyte

Abstract

The invention relates to an aqueous electrolyte for improving reversibility of a neutral zinc-manganese battery and a preparation method of the aqueous electrolyte, and the preparation method comprises the following steps: 1, preparing an inorganic zinc salt basic electrolyte: dissolving inorganic zinc salt in water, and stirring at room temperature to obtain the inorganic zinc salt basic electrolyte with a certain concentration; and 2, adding a certain amount of organic complexing agent according to the complexing molar ratio, and stirring at room temperature; according to the invention, thebeneficial effects are that the electrolyte wherein the positive electrode and the negative electrode are in direct contact is designed, the attenuation problem of the negative electrode and the positive electrode is solved, the stability of the current zinc-manganese battery based on the neutral aqueous electrolyte is improved, and the purpose of improving the reversibility of the neutral zinc battery is achieved. According to the electrolyte, the organic component is introduced, the electrolyte maintains the high safety characteristic of the original aqueous electrolyte, the introduced organic component is environmentally friendly and low in cost, and the electrolyte is suitable for any battery system based on a zinc metal or zinc alloy negative electrode and batched and large-scale battery preparation and production.

Description

technical field [0001] The invention relates to the field of zinc batteries, in particular to an aqueous electrolyte for improving the reversibility of a neutral zinc-manganese battery and a preparation method thereof. Background technique [0002] Compared with lithium-ion batteries based on organic electrolytes, aqueous batteries based on aqueous electrolytes are safer and have broad application prospects in the field of electrochemical energy storage, especially in the field of large-scale energy storage. In particular, the aqueous battery based on zinc metal negative electrode and manganese dioxide positive electrode has abundant reserves of zinc and manganese raw materials and low cost; compared with traditional lead-acid batteries, zinc and manganese have no environmental pollution; it has a theoretical energy density comparable to that of lithium batteries (446Wh / kg), is regarded as an ideal energy storage battery system for the next generation. However, the current...

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Problems solved by technology

[0004] Xu Chengjun and others used carbon-loaded manganese dioxide positive electrode materials to assemble a neutral zinc-manganese battery in the invention of patent No. CN104272523A. Although the specific capacity of manganese dioxide can be improved, this battery system cannot solve the problem of manganese. Dissolution and attenuation, after 3 cycles, nearly 25% of the capacity is lost; Wen Yuehua and others improved the cycle life of the zinc negative electrode by introducing a second diaphragm in the invention of the patent No. CN205388996U, but there is no positive electrode side. Improve

[0005] The main reason for limiting this type of battery at present is not only the problem of the zinc negative electrode: the solvation effect is prone to occur in the neutral aqueous electrolyte accompanied by the above-mentioned side reactions such as corrosion and dendrites; it is also closely related to the positive electrode: manganese is Can cause huge fluctuations in the pH of the electrolyte, thereby accelerating dissolution and decay

The above reports are limited to unilaterally improving the positive or negative electrodes, and have not fundamentally solved the problem of positive and negative electrodes at the same time.

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