水系固态锌离子电池的制备与电化学性能研究

Preparation and Electrochemical Performance of Water-Based Solid-State Zinc Ion Batteries

水系固态锌离子电池(ZIB)因具有安全、柔性和低成本的特点,在可穿戴电子设备能源领域备受关注。开发具有高锌离子迁移率的固态电解质是水系固态锌离子电池研究的热点之一。本文以明胶、过硫酸钾、丙烯酰胺和 N,N’-亚甲基双丙烯酰胺为原料,采用自由基聚合反应,将聚丙烯酰胺枝接到明胶上,制备得到一种高机械强度和锌离子迁移率(0.37 mS?cm?1)的水系固态凝胶电解质。并以水热法制备得到的α-MnO2为正极材料,电沉积法合成的锌为负电极,组装得到三明治构型的水系固态锌离子电池。在3333 mA/g电流密度下首次放电比容量达到231.5 mAh/g,307 mA/g电流密度下最高比容量达314 mAh/g。

The water-based solid state zinc ion battery(ZIB)has attracted much attention in the energy field of wearable electronic devices because of its safety,flexibility and low cost.The development of solid electrolytes with high zinc ion mobility is one of the hotspots for water-based solid state zinc ion batteries.In this paper,gelatin,potassium persulfate,acrylamide and N,N’-methylenebisacrylamide were used as raw materials,and the solid hydrogel electrolyte was prepared through grafting polyacrylamideonto gelatin via free radical polymerization method.Theα-MnO2 fabricated by hydrothermal method was used as the positive electrode material,and the zinc synthesized by electrodeposition method was used as negative electrodematerial.As a result,a water-based solid zinc ion battery with a sandwich configuration was assembled.High ionic mobility of 0.37 mS?cm?1 was computed out from the electrochemical impedance spectroscopy.And at the current density of 3333 mA/g,the first specific discharge capacity reached 231.5 mAh/g,and the highest specific capacity at 307 mA/g current density reached 314 mAh/g.