乙二醇辅助水热法合成一维正交相LiMnO2及其电化学性能  

Synthesis of One-dimensional Orthorhombic LiMnO2 via Glycol-assisted Hydrothermal Method and Their Electrochemical Properties

作　　者：高衍深 王昕璐 王进贤[1] GAO Yan-shen;WANG Xin-lu;WANG Jin-xian(School of Chemistry and Environmental Engineering,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学化学与环境工程学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2020年第2期120-126,共7页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省自然科学基金项目(20170101128JC)。

摘　　要：采用乙二醇辅助水热法制备了一维正交相LiMnO2正极材料,通过XRD、SEM对产物的物相组分、晶体结构和形貌进行了系统表征;通过恒电流充放电测试、交流阻抗测试等对合成的电极材料进行了电化学性能的分析和计算。结果表明,采用乙二醇辅助水热法制备的一维正交相LiMnO2正极材料与无乙二醇辅助水热制备相比,最终产物具有更高的物相纯度和更均匀的聚集形貌;电化学测试结构显示在电流密度为28.5 mAh/g时乙二醇辅助水热法制备的LiMnO2正极材料的最高放电比容量为203.82 mAh/g;电化学交流阻抗谱图拟合和计算的结果表明通过该方法制备的电极材料具有更低的电荷传质电阻和更好的锂离子固相扩散能力。One-dimensional Orthorhombic LiMnO2 cathode material was prepared by glycol-assisted hydrothermal method.The structure and morphology of the product were characterized by XRD and SEM. The product electrochemical performance was characterized by constant current charge and discharge and EIS test,analyzed and calculated. The results showed that the one-dimensional orthorhombic LiMnO2 cathode material prepared by glycol-assisted hydrothermal has better purity and more uniform morphology. Electrochemical tests showed the maximum discharge specific capacity was203.82 mAh/g at 28.5 mAh/g of LiMnO2 prepared via glycol assisted hydrothermal method. The EIS fitting and calculation results showed that the electrode material has lower charge transfer resistance and better lithium ion solid phase diffusion ability.

关 键 词：水热法 乙二醇辅助 LIMNO2 电化学性能 

分 类 号：TQ152[化学工程—电化学工业]