K2V3O8@GO as high-performance cathode material for aqueous rechargeable zinc ion battery

Abstract

Graphene oxide (GO) and layered K2V3O8 materials are compounded to prepare K2V3O8@GO composite materials with stable structure and excellent conductivity. Zn//K2V3O8@GO battery obtains a high specific capacity of 334.8 mAh g−1 at 100 mA g−1, excellent rate capability with high specific capacity of 161.2 mAh g−1 at 5000 mA g−1 and good cycle stability with capacity retention of 75.7% after 2000 cycles at 5000 mA g−1. Large specific surface area, stable structure and excellent conductivity of K2V3O8@GO are responsible for its improved electrochemical property.