期刊
ELECTROCHIMICA ACTA
卷 143, 期 -, 页码 407-414出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.08.033
关键词
Multi-transition-metal phosphate; Nanocomposite; Carbon source; Cathode material; Lithium-ion battery
资金
- 863 Program [2012AA111401]
- Natural Science Foundation of Jiangsu Province [BK2012293, BK20130482]
- University Natural Science Research Project of Jiangsu Province [13KJB430008]
- Research Foundation for Advanced Talents of Jiangsu University in China [13JDG071, 12JDG054]
Core-shell type olivine solid solutions, LiFe1/3Mn1/3Co1/3PO4/C, are synthesized via a very simple and rapid microwave heating route with different carbon sources. The obatined LiFe1/3Mn1/3Co1/3PO4/C materials are characterized thoroughly by various analytical techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy-dispersive spectroscopy instrument. The particle sizes and distribution of the carbon layer of BP2000 carbon black coated LiFe1/3Mn1/3Co1/3PO4 (LiFe1/3Mn1/3Co1/3PO4/BP) are more uniform than that obtained from acetylene black (LiFe1/3Mn1/3Co1/3PO4/AB) and Super P (LiFe1/3Mn1/3Co1/3PO4/SP). Moreover, the LiFe1/3Mn1/3Co1/3PO4/BP nanocomposite shows superior electrochemical properties such as high discharge capacity of 160mA h g(-1) at 0.1 C, excellent cyclic stability (143 mA h g(-1) at 0.1 C after 30 cycles) and rate capability (76 mA h g(-1) at 20 C), which are better than other two samples. Cyclic voltammetric and electrical tests disclose that the Li-ion diffusion, the reversibility of lithium extraction/insertion and electrical conductivity are significantly improved in LiFe1/3Mn1/3Co1/3PO4/BP composite. Electrochemical impedance spectroscopy illustrates that LiFe1/3Mn1/3Co1/3PO4/BP composite electrode possesses low contact and charge-transfer impedances, which can lead to rapid electron transport during the electrochemical lithium insertion/extraction reaction. It is believed that olivine solid solution LiFe1/3Mn1/3Co1/3PO4 decorated with carbon from appropriate carbon source is a promising cathode for high-performance lithium-ion batteries. (C) 2014 Elsevier Ltd. All rights reserved.
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