Boosting aqueous zinc-ion storage by synergistically coupling sodium manganese oxides with MXene nanosheets

Aqueous zinc ion batteries (ZIBs) are regarded as a promising battery mainly due to their high safety and environmental friendliness, but suffer from low capacity and energy density . Herein, a pre-intercalated manganese oxide (Na 0.55 Mn 2 O 4 ·1.5 H 2 O)/MXene hybrid (NMO/MXene) is successfully proposed for high-performance ZIBs , in which synergistic effect between MXene and NMO greatly improves the structural stability of NMO and facilitates fast charge transfer and ion diffusion kinetics. Therefore, the resulting NMO/MXene cathodes deliver high-rate capacity of 180 mAh g −1 at 10 C (3.08 A g −1 ) and long cycling life over 2500 times at 5 C, outperforming most reported Mn-base cathodes. The MXene-mediated strategy for advanced Mn-based cathodes developed here paves a new way to construct high-performance Zn-MnO 2 batteries.