Synthesis of Mn(OH)2 Nanosheets on Carbon Cloth for High-Performance Aqueous Zinc-Ion Battery

Abstract

Rechargeable aqueous zinc ion battery has attracted renewed interest for large-scale energy storage system. However, the cathodic electrode material limits the battery capacity and thus the overall energy density. Herein, The layered Mn(OH)2 nanosheets were prepared on carbon cloth via direct electrodeposition. The Mn(OH)2 nanosheets show excellent electrochemical performance, including a high specific discharge capacity of 188.13 mAh g−1 at 0.1 A g−1 and great long term cycle stability (the capacity remains nearly 83.2% after 1000 cycles). The excellent performances are attributed to Mn(OH)2 nanosheets grown perpendicular to the substrate, which provides a large number of active sites for Zn2+ intercalation/de-intercalation. Furthermore, the layered Mn(OH)2 can be simply produced based on the cathodic electrolytic electrodeposition which shows great potential in practical application.