Stable Rechargeable Aqueous Zinc Ion Battery Achieved by Cation Deficient Cathode Material and Gelatin Modified Separator

Abstract

In this research, manganese deficient zinc manganese oxide was synthesized by oxidation-precipitation with different zinc and manganese ratio. The cathode material synthesized with 1:3 zinc to manganese ratio has the highest initial capacity and also best rate performance. Then, gelatin modified separator was introduced into the battery system to prolong the battery cycle life. The capacity retention achieves 91.3% after 500 cycles at the current density of 300mA·g-1, which is an unimaginable improvement.