水溶-蒸发法制备LiFePO4/C及电化学性能研究

doi:10.61558/2993-074X.2106

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (2): 146-150. doi: 10.61558/2993-074X.2106

水溶-蒸发法制备LiFePO₄/C及电化学性能研究

古宁宇^*，何兴华，李洋

南昌大学化学系，江西南昌 330031

收稿日期:2012-02-17 修回日期:2012-03-19 出版日期:2013-04-28 发布日期:2012-03-29
通讯作者: 古宁宇 E-mail:nygu@ncu.edu.cn
基金资助:
江西省科技支撑项目（No. 2010BGB01001）及江西省教育厅科技项目（No. GJJ11278）资助

Electrochemical Performance of LiFePO₄/C Synthesized via Aqueous Solution-Evaporation Route

GU Ning-yu^*, HE Xing-hua，LI Yang

Department of Chemistry, Nanchang University, Nanchang 330031, Jiangxi, China

Received:2012-02-17 Revised:2012-03-19 Published:2013-04-28 Online:2012-03-29
Contact: GU Ning-yu E-mail:nygu@ncu.edu.cn

摘要/Abstract

摘要： 由LiH₂PO₄和FeC₂O₄.2H₂O作原料、柠檬酸为碳源，用水溶-蒸发法制备了LiFePO₄/C正极样品. 采用X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）分析、观察样品. 用充放电曲线和电化学交流阻抗（EIS）谱图测试LiFePO₄/C电极. 结果表明，700 ^oC焙烧的LiFePO₄/C样品（碳量3.03%，by mass）结晶度高，无杂相，颗粒粒径100 nm，其表面包覆约5 nm碳层. 该电极0.5C、2C、5C和10C（1C = 170 mA.g^-1）倍率放电其比容量分别为148.2 mAh.g^-1、142.4 mAh.g^-1、127.4 mAh.g^-1和108.5 mAh.g^-1，循环寿命曲线稳定.

关键词: 锂离子电池, 正极材料, LiFePO₄/C, 柠檬酸

Abstract: The LiFePO₄/C samples have been synthesized via an aqueous solution-evaporation route with LiH₂PO₄, FeC₂O₄.2H₂O as raw materials and citric acid as a carbon source. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to analyze structure and morphology of the samples. The electrochemical performances of the LiFePO₄/C cathodes were characterized by charge/discharge cures and electrochemical impedance spectroscopy (EIS). The results show that the LiFePO₄/C sample, calcined at 700 °C and contained 3.03% (by mass) carbon, exhibited a highly pure crystalline phase with the primary particles sizes of 100 nm. The surfaces of those particles were covered by a carbon layer of 5 nm in thickness. At the rates of 0.5C, 2C, 5C, and 10C, where 1C corresponds to 170 mA.g^-1, the discharge capacities of 148.2, 142.7, 127.4, and 108.5 mAh.g^-1, were delivered, respectively, with the perfect cycling stabilities.

Key words: lithium-ion batteries, cathode material, LiFePO₄/C, citric acid

中图分类号:

O646

古宁宇, 何兴华, 李洋. 水溶-蒸发法制备LiFePO₄/C及电化学性能研究[J]. 电化学（中英文）, 2013, 19(2): 146-150.

GU Ning-yu, HE Xing-hua, LI Yang. Electrochemical Performance of LiFePO₄/C Synthesized via Aqueous Solution-Evaporation Route[J]. Journal of Electrochemistry, 2013, 19(2): 146-150.

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https://electrochem.xmu.edu.cn/CN/Y2013/V19/I2/146

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水溶-蒸发法制备LiFePO₄/C及电化学性能研究

Electrochemical Performance of LiFePO₄/C Synthesized via Aqueous Solution-Evaporation Route

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