Citation: HU You-Kun, REN Jian-Xin, WEI Qiao-Ling, GUO Xiao-Dong, TANG Yan, ZHONG Ben-He, LIU Heng. Synthesis of Rod-Like LiFePO₄/C Materials with Different Aspect Ratios by Polyol Process[J]. Acta Physico-Chimica Sinica, ;2014, 30(1): 75-82. doi: 10.3866/PKU.WHXB201311261 shu

Synthesis of Rod-Like LiFePO₄/C Materials with Different Aspect Ratios by Polyol Process

1.
1 College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
2 College of Materials Science and Engineering, Sichuan University, Chengdu 610064, P. R. China;
3 Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China

Received Date: 11 August 2013
Available Online: 26 November 2013
Fund Project: 四川大学青年基金(2011SCU11081) (2011SCU11081)教育部高校博士学科点科研基金(20120181120103)资助项目 (20120181120103)

Rod-like LiFePO₄/C particles with different aspect ratios were synthesized by controlling the reflux reaction time in polyol medium at a low temperature, using an Fe³⁺ salt as the iron source. The precursors and final LiFePO₄/C samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge test. The results show that the reflux reaction time has a significant effect on the characteristics of the LiFePO₄ precursors and electrochemical performance of the final LiFePO₄/C samples. The morphology of the precursors is transformed from irregular short rod-like particles into regular long rod-like particles, and the aspect ratios of the rods increase with increasing reflux reaction time from 4 to 16 h. At a reflux reaction time of 10 h, the material contains multifarious morphologies, which is beneficial to the electron transmission, and displays an excellent electrochemical performance at low discharge rates, the discharge capacity is 163 mAh·g^-1 at 0.1C rate. Extension of the reflux reaction time to 16 h, the material reveals the biggest aspect ratio, which is conducive to the diffusion of lithium ions, and gives od electrochemical performance at high discharge rates, the discharge capacities are measured to be 135, 125, 118, 110, and 98 mAh·g^-1 at 1C, 3C, 5C, 10C, and 20C rates, respectively, revealing od cycling performance and little capacity fading.
- LiFePO₄,
- Lithium-ion battery,
- Polyol process,
- Triethylene glycol,
- Reflux reaction time
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Synthesis of Rod-Like LiFePO4/C Materials with Different Aspect Ratios by Polyol Process

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Synthesis of Rod-Like LiFePO₄/C Materials with Different Aspect Ratios by Polyol Process