Zinc ion battery diaphragm for inhibiting dendritic crystal growth and preparation method

Abstract

The invention discloses a zinc ion battery diaphragm for inhibiting dendritic crystal growth and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing a nanocellulose solution with sulfuric acid and potassium permanganate at 80-100 DEG C, and continuously reacting to obtain a nanocellulose / manganese dioxide suspension; filtering, washing and precipitating the nanocellulose / manganese dioxide suspension to obtain a nanocellulose / manganese dioxide film; and finally, freezing the obtained nanocellulose / manganese dioxide film, and performing vacuum freeze drying to obtain the nanocellulose / manganese dioxide film, namely the zinc ion battery diaphragm for inhibiting dendritic crystal growth. The battery diaphragm prepared by the invention can effectively inhibit the growth of dendritic crystals of the zinc ion battery, and the service life of the battery is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, relates to a preparation method of an aqueous zinc ion battery diaphragm material, and in particular relates to a zinc ion battery diaphragm that inhibits zinc dendrites and a preparation method thereof. Background technique [0002] The wide application of lithium batteries has brought great convenience to our lives, but the safety and environmental protection issues of lithium batteries have become increasingly prominent. Due to the high theoretical capacity of zinc anode (820mAh / g and 5855mAh / cm 3 ), low redox potential (-0.76V vs. SHE), low cost, and good safety, making aqueous zinc-ion batteries regarded as one of the ideal energy storage battery systems. Among them, the negative electrode of the battery adopts zinc metal, which can undergo two electron transfer reaction in neutral aqueous electrolyte, so it can provide higher storage energy for the battery; compared...

AI Technical Summary

Problems solved by technology

[0003] In order to prevent dendrites from piercing the diaphragm, glass fiber membranes are mainly used in the industry at present, which can effectively prevent dendrites from piercing, but the mechanical strength of glass fiber membranes is not high, it does not have the function of preventing dendrites, and its water retention is low. Not conducive to maintaining the long life of zinc-ion batteries

At present, people mainly work on modifying glass fiber membrane and Nafion membrane to improve their strength and water retention, but this increases the cost and process complexity, weakening the advantages of zinc-ion batteries

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