中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 28 No. 9 September 2018 |
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, China;
3. College of Chemistry and Materials Science, Longyan University, Longyan 364000, China）
Abstract:In order to find the appropriate material to load selenium for higher performance of rechargeable Li-Se batteries, the resorcinol-formaldehyde resins derived monodisperse carbon spheres (RFCS)/Se composites were fabricated by the melting- diffusion method. The RFCS were obtained from initial carbonization of resorcinol-formaldehyde resins and subsequent KOH activation. Three kinds of samples of the RFCS/Se composites with different mass ratios were characterized by XRD, Raman spectroscopy, SEM, BET and EDS tests, which demonstrate that the samples with diverse mass fractions of selenium have distinct interior structure. The most suitable RFCS/Se composite is found to be the RFCS/Se-50 composite, which delivers a high reversible capacity of 643.9 mA·h/g after 100 cycles at current density of 0.2C.
Key words: lithium-selenium batteries; cathode material; carbon sphere; sol-gel process
