MnO2 Nanosheets Assembled Carbon Nanotube Composite Material as High Efficiency Cathode for Aqueous Rechargeable Zinc Ion Battery

Manganese-based oxides due to good zinc storage property have been extensively developed for rechargeable aqueous zinc ion batteries (AZIBs). However, its insufficient structural stability and poor conductivity restricts their practice application for AZIBs. In this work, a MnO2 nanosheet assembled hydroxylated carbon nanotubes material is synthesized by an in situ growth strategy. In the AZIBs, HCNTs@MnO2 cathode materials yield high specific capacity with 267 mAh<middle dot>g-1 at 0.1 A<middle dot>g-1 and maintain capacity retention rate of more than 96% after 500 cycles at high current density of 1 A<middle dot>g-1. The X-ray diffraction and electrochemical impedance spectroscopy demonstrate an energy storage mechanism of Zn2+ and H+ fast co-embedding behavior. This work offers a novel insight into manganese-based oxides as high-performance cathode for AZIBs.