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Fabrication of ZnSe/C Hollow Polyhedrons for Lithium Storage |
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| Authors: | Prof Jujun Yuan Xiaofan Li Haixia Li Weidong Lai Yunfei Gan Prof Jianwen Yang Prof Xianke Zhang Prof Jun Liu Prof Xiurong Zhu Prof Xiaokang Li |
| Institution: | 1. School of Physics and Electronics, Gannan Normal University, Ganzhou, 41000 P. R. China;2. School of Physics and Electronics, Gannan Normal University, Ganzhou, 41000 P. R. China
College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, 341000 P. R. China;3. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, P. R. China |
| Abstract: | 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. |
| Keywords: | anode carbon layer lithium ion battery ZnSe/C hollow polyhedrons ZIF-8 |