期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 16, 期 4, 页码 1675-1681出版社
SPRINGER
DOI: 10.1007/s10008-011-1571-9
关键词
Carbon source; LiFePO4; PS nano-sphere; Lithium ion battery; Cathode material
资金
- Guangdong Natural Science Foundation [9151064201000039]
- Guangdong Science and Technology Planning Project [2009B010900025, 2010B080701072]
- National Natural Science Foundation of China [20963002, 51003034]
- Key Academic Program of the 3rd phase 211 Project [2009B010100001]
- South China Agricultural University [K09140]
- Key Laboratory of Renewable Energy and Gas Hydrate of the Chinese Academy of Sciences [2010002]
Olivine LiFePO4/C cathode materials for lithium ion batteries were synthesized using monodisperse polystyrene (PS) nano-spheres and other carbon sources. The structure, morphology, and electrochemical performance of LiFePO4/C were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge tests, electrochemical impedance spectroscopy (EIS) measurements, and Raman spectroscopy measurements. The results demonstrated that LiFePO4/C materials have an ordered olivine-type structure with small particle sizes. Electrochemical analyses showed that the LiFePO4/C cathode material synthesized from 7 wt.% PS nano-spheres delivers an initial discharge capacity of 167 mAh g(-1) (very close to the theoretical capacity of 170 mAh g(-1)) at 0.1 C rate cycled between 2.5 and 4.1 V with excellent capacity retention after 50 cycles. According to Raman spectroscopy and EIS analysis, this composite had a lower I (D)/I (G), sp (3)/sp (2) peak ratio, charge transfer resistance, and a higher exchange current density, indicating an improved electrochemical performance, due to the increased proportion of graphite-like carbon formed during pyrolysis of PS nano-spheres, containing functionalized aromatic groups.
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