期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 811, 期 -, 页码 1-7出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.01.026
关键词
LiFePO4; Hydrothermal method; Grapheme oxide; Li-ion batteries
资金
- Shenzhen Bureau of Science, Technology and Innovation Commission [JCYJ20140417172417151, JCYJ20160525163956782]
Olivine lithium iron phosphate (LFPO) assimilated with reduced grapheme oxide (rGO) was prepared via an easy and cost-effective hydrothermal synthesis, and the resultant composites were employed as active positive electrode for lithium-ion batteries (LIBs). The structural and morphological features were studied by XRD, Raman, SEM, TEM and surface area analysis (BET). The electrochemical properties of the LFPO/rGO composite is evaluated by CV, CP and EIS. The LFPO/rGO composite with a high specific area (94.7 m(2)/g) was constituted with 74% LFPO and 26% rGO. The LFPO/rGO composite as a LIB cathode displayed a superior initial discharge capacity of 163.3 mAh/g at a current density of 0.2 C and sustained a capacity of 110.6 mAh/g at a high current density of 10 C for 150 consecutive cycles. The existence of highly conductive rGO and a short transportation span for both Li-ions and electrons made LFPO/rGO composite as a promising cathode in LIBs even at high rates.
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