Fabrication of ZnSe/C Hollow Polyhedrons for Lithium Storage

• Published in: Chemistry : a European journal 2021-10, Vol.27 (60), p.14989-14995
• Main Authors: Yuan, Jujun, Li, Xiaofan, Li, Haixia, Lai, Weidong, Gan, Yunfei, Yang, Jianwen, Zhang, Xianke, Liu, Jun, Zhu, Xiurong, Li, Xiaokang
• Format: Article
• Language: English
• Subjects: anode; Anodes; carbon layer; Chemistry; Electrochemical analysis; Electrochemistry; Fabrication; Lithium; lithium ion battery; Lithium-ion batteries; Metal-organic frameworks; Ostwald ripening; Polyhedra; Rechargeable batteries; Resorcinol; Zeolites; ZIF-8; ZnSe/C hollow polyhedrons
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.202102828

ZnSe has got extensive attention for high‐performance LIBs anode due to its remarkable theoretical capacity and environmental friendliness. Nevertheless, the large volume variation for the ZnSe in the discharge/charge processes brings about rapid capacity fading and poor rate performance. Herein, ZnSe/C hollow polyhedrons are successfully synthesized by selenization of zeolitic imidazolate framework‐8 (ZIF‐8) with resorcinol‐formaldehyde (RF) coating. The protection of C layer derived from RF coating layer and Ostwald ripening during the process of selenization play important roles in promoting formation of ZnSe/C hollow polyhedrons. The ZnSe/C hollow polyhedrons exhibit good rate performance and long‐term cycle stability (345 mAh g−1 up to 1000 cycles at 1 A g−1) for lithium ion batteries (LIBs) anode. The improved electrochemical performance is benefit from the unique ZnSe/C hollow structure, in which the hollow structure can effectively avoid terrible volume expansion, and the thin ZnSe/C shell can not only provide adequate diffusion paths of lithium ions and but also enhance the electronic conductivity. ZnSe/C hollow polyhedrons are successfully synthesized by selenization of zeolitic imidazolate framework‐8 (ZIF‐8) with resorcinol‐formaldehyde (RF) coating. The protection of C layer derived from RF coating layer and Ostwald ripening during the process of selenization play important roles in promoting formation of ZnSe/C hollow polyhedrons. As lithium ion batteries anode, the ZnSe/C hollow polyhedrons exhibit good rate performance and long‐term cycle stability.