Preparation and electrochemical properties of a LiFePO4/C composite cathode material by a polymer-pyrolysis–reduction method |
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| Authors: | Kerun Yang Ziji Lin Xuebu Hu Zhenghua Deng Jishuan Suo |
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| Affiliation: | aChengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, Sichuan 610041, PR China;bGraduate School of Chinese Academy of Sciences, Beijing 100039, PR China;cDepartment of Chemistry and Materials, Sichuan Normal University, Chengdu, Sichuan 610066, PR China;dZhongke Laifang Power Science & Technology Co., Ltd., Chengdu, Sichuan 610041, PR China |
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| Abstract: | A LiFePO4/C composite was successfully prepared by a polymer-pyrolysis–reduction method, using FePO4·2H2O and lithium polyacrylate (PAALi) as raw materials. The structure of the LiFePO4/C composites was investigated by X-ray diffraction (XRD). The micromorphology of the precursor and LiFePO4/C powders was observed using scanning electron microscopy (SEM), and the in situ coating of carbon on the particles was observed by transmission electron microscopy (TEM). Furthermore, the electrochemical properties were evaluated by cyclic voltammograms (CVs), electrochemical impedance spectra (EIS) and constant current charge/discharge cycling tests. The results showed that the sample synthesized at 700 °C had the best electrochemical performance, exhibiting initial discharge capacities of 157, 139 and 109 mAh g−1 at rates of 0.1, 1 and 5 C, respectively. Moreover, the sample presented excellent capacity retention as there was no significant capacity fade after 50 cycles. |
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| Keywords: | Lithium iron phosphate Polymer-pyrolysis&ndash reduction Lithium polyacrylate |
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