Fabrication of ZnSe/C Hollow Polyhedrons for Lithium Storage

作者：Yuan, Jujun; Li, Xiaofan; Li, Haixia; Lai, Weidong; Gan, Yunfei; Yang, Jianwen^*; Zhang, Xianke; Liu, Jun^*; Zhu, Xiurong; Li, Xiaokang^*

来源：Chemistry - A European Journal, 2021, 27(60): 14989-14995.

DOI：10.1002/chem.202102828

• anode
• carbon layer
• lithium ion battery
• ZnSe
• C hollow polyhedrons
• ZIF-8

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.

• 单位
  xk; 桂林理工大学