Sintering preparation method for zinc anode material

Abstract

The invention relates to a sintering preparation method for a zinc anode material. The method comprises the steps that the temperature of a mixture including zinc sources and phosphorus sources is increased to 550 DEG C-850 DEG C under protection of protective gas at the temperature increasing speed of 0.1-20 DEG C / min, a thermostatic reaction is performed for 0.5-48 h, after the reaction is finished, cooling and smashing are performed, and then zinc phosphate or zinc pyrophosphate or zinc tripolyphosphate or a mixture of the zinc phosphate and the zinc pyrophosphate and the zinc tripolyphosphate, namely, the zinc anode material is obtained. The method for preparing the zinc anode material has the advantages of being simple in technology, low in cost and little in pollution. The zinc anode material prepared by adopting the method can be applied to a battery system with an alkaline and neutral aqueous solution, is a suitable electrode active material, is low in cost and high in activity and has the wide application prospect in energy storage aspects of electric tools, electric vehicles, power grids and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical engineering and industrial devices, in particular to a sintering preparation method of a zinc negative electrode material in the technical field of battery production, which can be used as an electrode active material in a battery system of alkaline and neutral aqueous solutions. Background technique [0002] Since human society entered into industrialization, there has been a huge demand for coal and oil and other mineral energy. With the huge consumption of non-renewable energy such as coal and oil, resources are increasingly scarce. The greenhouse effect intensified by carbon dioxide emissions and the increasingly serious pollution of the air and ecological environment have posed a serious threat to the earth on which we live. Vigorously developing renewable energy such as wind energy and solar energy is an important way to achieve sustainable energy development in my country. Renewable energy g...

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Problems solved by technology

[0005] The secondary zinc electrode usually uses a paste-type zinc oxide (ZnO) electrode. Since the ZnO formed during the discharge process has a large solubility in the alkali solution, zinc dendrites and zinc plate deformation are easily generated during the cycle, which makes the zinc The life of the electrode is usually limited to about 300 cycles

The mechanical rechargeable type is simple and easy to operate, but there are also problems such as complicated operation of replacing the negative electrode and poor sealing.

However, charging with the third electrode is still prone to zinc dendrites and zinc electrode deformation.

In recent years, some researchers have adopted the charging method of "in vivo and external" circulation of active materials and electrolytes to solve the problem of deformation and dendrites in the zinc electrode during charging, but with complex circulation devices and electrolyte treatment systems, the battery The specific energy of the battery is significantly reduced, and the internal resistance of the battery is large, making maintenance difficult

Taking advantage of the high solubility of ZnO in alkaline solution, our research group designed a dissolution / deposition type liquid flow zinc electrode, which can easily solve the problems of dendrites, deformation and passivation, and overcome the shortcomings of the current alkaline zinc electrode with poor cycle life. , but the specific energy of the battery is low

Zinc-bromine batteries, etc., use the characteristics of high solubility of zinc halides in near-neutral solutions to design dissolution / deposition type liquid-flow zinc electrodes to improve the shortcoming of poor cycle life of zinc electrodes in near-neutral solutions, but the specific energy of the battery also lower

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