Constructing a disorder/order structure for enhanced magnesium storage

Rechargeable magnesium-ion batteries (MIBs) are a potential alternative to lithium-ion batteries (LIBs). However, the strong interaction between the divalent Mg2+ and the host lattice leads to the destruction of electrode materials structure. In this work, we have presented electrochemically induced formation of disorder/order structure to improve the structural stability of electrode material during magnesium storage. FeVO4 cathode displays a high Mg storage capacity (~300 mAh g−1) and excellent cycling stability (capacity retention of 85% after 1000 cycles at 1 A g−1). Additionally, the Mg storage mechanism of FeVO4 cathode is demonstrated as the irreversible transformation at first discharge process and the reversible intercalation-type reaction at subsequent cycling. This work demonstrates that disorder/order engineering is a new way to achieve excellent magnesium storage performance.