Affiliation:
1. Faculty of Science and Art Department of Chemistry İnönü University Malatya 44280 Turkey
2. College of Chemistry and Chemical Engineering Central South University Changsha 410083 China
Abstract
AbstractTransition metal selenides (TMSs) are receiving considerable interest as improved anode materials for sodium‐ion batteries (SIBs) and lithium‐ion batteries (LIBs) due to their considerable theoretical capacity and excellent redox reversibility. Herein, ZIF‐12 (zeolitic imidazolate framework) structure is used for the synthesis of Cu2Se/Co3Se4@NPC anode material by pyrolysis of ZIF‐12/Se mixture. When Cu2Se/Co3Se4@NPC composite is utilized as an anode electrode material in LIB and SIB half cells, the material demonstrates excellent electrochemical performance and remarkable cycle stability with retaining high capacities. In LIB and SIB half cells, the Cu2Se/Co3Se4@NPC anode material shows the ultralong lifespan at 2000 mAg−1, retaining a capacity of 543 mAhg−1 after 750 cycles, and retaining a capacity of 251 mAhg−1 after 200 cycles at 100 mAg−1, respectively. The porous structure of the Cu2Se/Co3Se4@NPC anode material can not only effectively tolerate the volume expansion of the electrode during discharging and charging, but also facilitate the penetration of electrolyte and efficiently prevents the clustering of active particles. In situ X‐ray difraction (XRD) analysis results reveal the high potential of Cu2Se/Co3Se4@NPC composite in building efficient LIBs and SIBs due to reversible conversion reactions of Cu2Se/Co3Se4@NPC for lithium‐ion and sodium‐ion storage.