Universal Source‐Template Route to Metal Selenides Implanting on 3D Carbon Nanoarchitecture: Cu<sub>2−x</sub>Se@3D‐CN with SeC Bonding for Advanced Na Storage
Jun Yuan, Biao Yu, Duo Pan, Xiang Hu, Junxiang Chen, Mujtaba Aminua, Yangjie Liu, LiangMei Sheng, Yuhua Chen, Yongmin Wu, Hongbing Zhan, Zhenhai Wen
Abstract
Abstract The development of high‐performance sodium ion batteries (SIBs) is heavily relied on the exploration of the appropriate electrode material for Na + storage, which ought to feature merits of high capacity, easy‐to‐handle synthesis, high conductivity, expedite mass transportation, and stable structure upon charging–discharging cycle. Herein, a universal source‐template method is reported to synthesize a variety of transition metal (e.g., V, Sb, W, Zn, Fe, Co, Ni, and Cu) selenides implanting on N doped 3D carbon nanoarchitecture hybrids (M m Se n @3D‐CN) with powerful SeC bonding rivet. Benefiting from the superior architecture and potent SeC bonding between Cu 2−x Se and N‐doped 3D carbon (3D‐CN), the Cu 2−x Se@3D‐CN nanohybrids, as anode of SIBs, show high capacity, high‐rate capability, and long‐cycle durability, which can deliver a reversible capacity of as high as 386 mAh g −1 , retain 219 mAh g −1 even at 10 A g −1 , and run durably over thousands of charging–discharging cycles. The Cu 2−x Se@3D‐CN as anode is also evaluated by developing a full SIB by coupling with the Na 3 V 2 (PO 4 ) 3 cathode, which can deliver high energy density and show excellent stability, shedding light on its potential in practical application.