Influence of carbon sources on electrochemical performances of LiFePO4/C composites
(0) LiFePO4/C was synthesized via a solid-state reaction under N2 atmosphere, and the reaction precursor was prepared by a sol-gel method. The XRD results prove that the sintering temperature and carbon source have played a very important role in the crystallinity of LiFePO4/C composite. Complete crystallization occurred in the temperature range of 650-700℃. The X-ray diffraction intensity of LiFePO4/C composite dropped, when the carbon source content was beyond 20%. The particles of synthesized LiFePO4/C were fine and homogeneous in size, with an average diameter of 100 nm. Charge-discharge tests were done with the synthesized LiFePO4/C served as cathode materials. It was found that the carbon source has a close relation to the initial discharge capacity of the composites. At a discharge rate of 0.1 C, the initial discharge capacities were 125.3,133.3 and 155.0 mAh·g(-1) with the 20% content of acetylene black, sucrose and glucose as the carbon sources respectively. The LiFePO4/C composite prepared with glucose as the carbon source exhibited excellent large current charge-discharge properties. At discharge rates of 1 C and 3 C, the initial discharge capacities were 90% and 80%, respectively of that at 0.1 C.
LiFePO4/C Lithium ion battery Composite Cathode material
Zhao-yong Chen Hua-li Zhu Shan Ji Rushanah Fakir Vladimir Linkov
College of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, College of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, SAIAMC, University of the Western Cape, Cape Town, South Africa
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1810-1815
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）