首页|固相烧结法制备锂离子电池正极材料Li2FeP2O7及其电化学性能研究

固相烧结法制备锂离子电池正极材料Li2FeP2O7及其电化学性能研究

Synthesis of Li2FeP2O7 Cathode Material at Different Temperatures and Its Electrochemical Performance for Lithium Ion Batteries

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介绍了一种先冷冻干燥后固相烧结制备正极材料Li2FeP2O7的方法.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和傅里叶变换红外光谱(FTIR)对材料的组成和形态进行表征,并通过循环伏安曲线(CV)和电化学阻抗谱(EIS)研究了 Li2FeP2O7材料的电化学性能.研究发现,合成Li2FeP2O7的最佳温度为590℃,此温度下反应较完全且产物杂质较少,1.6C倍率下的放电比容量达到55 mA·h·g-1,明显高于其它温度下合成样品的放电比容量.该温度下合成的Li2FeP2O7还具有低阻抗和较大的交换电流密度,说明这种合成方式有利于提高锂离子在Li2FeP2O7中的扩散.
The cathode material Li2FeP2O7 was synthesized via freeze-drying and followed by solid state sintering method.X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and Fourier transform infrared spectroscopy(FTIR)were used to characterize the struc-ture,composition and morphology of the material.In addition,the electrochemical performance of the Li2FeP2O7 material was investigated by cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS).It was found that the greatest particle quality could be acquired when the synthesis temperature of Li2FeP2O7 was 590℃.The discharge specific capacity reached 55.0 mA·h·g-1at 1.6C,which was much higher than that of the samples synthesized at other temperatures.The Li2FeP2O7 synthesized at 590℃had a low im-pedance and a large exchange current density,which facilitated the diffusion of lithium ions and improved the electrochemical performance.

Lithium ion batteryCathodeLi2FeP2O7Solid state sintering method

王任衡、肖哲、李艳、孙一翎、范姝婷、郑俊超、钱正芳、贺振江

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深圳大学物理与光电工程学院,深圳518060

中南大学冶金与环境学院,长沙410083

锂离子电池 正极 Li2FeP2O7 固相烧结法

深圳市基础研究基金深圳市基础研究基金广东省基础与应用基础研究基金国家自然科学基金深圳市孔雀团队项目国家重点研发计划项目

20180123JCYJ201908081738152052019A151501211151804199KQTD201804121814223992019YFB2204500

2021

10.7503/cjcu20200630

高等学校化学学报
中华人民共和国教育部委托 吉林大学和南开大学

高等学校化学学报

CSTPCDCSCD北大核心SCI
影响因子：1.067
ISSN：0251-0790
年,卷(期)：2021.42(4)
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