Ni 3 Se 2 electrodes for high performance lithium-ion and sodium-ion batteries

Abstract Analogous to the element sulfur in Li-S battery, selenium and selenide attract considerable attention in lithium-ion and sodium-ion batteries (LIBs and SIBs) electrodes. In this paper, Ni3Se2 electrodes are synthesized by a facial hydrothermal method at low temperature. The Ni3Se2 materials exhibit excellent electrochemical performance in both LIBs and SIBs. It can deliver a high reversible capacity of 626.7 mAh/g at 100th cycles at the rate of 0.5 A/g for LIBS. For SIBs, it also can reach up to a high capacity of 339.7 mAh/g at 100th cycle at the rate of 0.5 A/g. The excellent electrochemical performance of the Ni3Se2 electrode enables its application in the fields of energy storage and conversion.