Dual-modification of manganese oxide by heterostructure and cation pre-intercalation for high-rate and stable zinc-ion storage

Zinc-ion batteries (ZIBs) possess great advantages in terms of high safety and low cost,and are regarded as promising alternatives to lithium-ion batteries (LIBs).However,limited by the electrochemical kinetics and structural stability of the typical cathode materials,it is still difficult to simultaneously achieve high rates and high cycling stability for ZIBs.Herein,we present a manganese oxide (SnMn O/Sn O) material that is dual-modified by Sn O/Mn Oheterostructures and pre-intercalated Sncations as the cathode material for ZIBs.Such modification provides sufficient hetero-interfaces and expanded interlayer spacing in the material,which greatly facilitates the insertion/extraction of Zn.Meanwhile,the‘‘structural pillars”of Sncations and the‘‘pinning effect”of SnOalso structurally stabilizes the Mn Ospecies during the repeated Zninsertion/extraction,leading to ultra-high cycling stability.Due to these merits,the SnMn O/Sn Ocathode exhibits a high reversible capacity of 316.1 m Ah gat 0.3 A g,superior rate capability of 179.4 m Ah gat 2 A g,and 92.4%capacity retention after 2000 cycles.Consequently,this work would provide a promising yet efficient strategy by combining heterostructures and cations preintercalation to obtain high-performance cathodes for ZIBs.