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5V正极材料LiCr_(0.5)Mn_(1.5)O_4的电化学性能研究 被引量：1

Study on electrochemical performance of 5 V cathode material LiCr_(0.5)Mn_(1.5)O_4
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摘要 采用柠檬酸络合法,制备了尖晶石结构的LiCr0.5Mn1.5O4正极材料。通过循环伏安、电化学阻抗谱、恒流充放电等方法,测试其电化学性能。结果表明:铬离子的加入不但增加了锰离子的平均化合价,有效抑制了Jahn-Teller效应,而且达到了5V的工作电压,稳定了尖晶石结构。材料存在一个活化过程,最大放电比容量达到了145.85mAh·g–1。经过30次充放电循环之后,放电比容量仍然稳定在121.33mAh·g–1,显示了良好的循环性能,为高电位锂离子电池应用提供了良好的应用前景。 Spinel cathode material LiCr0.5Mn1.5O4 was prepared by citric acid method and characterized by cyclic voltammetry, electrochemical impedance spectroscopy and constant current charge-discharge. The results show that the addition of Cr^3＋ not only enhanced the average valence of Mn and restrained the influence of Jahn-Teller, but also stabilized the spinel structure and increased operation potential in 5 V. The materials display a process of activation and gave a peak capacity of 145.85 mAh ·g^-1. The discharge capacities remain at 121.33 mAh · g^-1 after 30 of charge-discharge cycles which indicated the better cyclieity and hopeful application in high potential lithium-ion battery.
作者 巩桂英 徐宇虹 马萍 张宝宏
机构地区 哈尔滨工程大学材料科学与化学工程学院
出处 《电子元件与材料》 CAS CSCD 北大核心 2007年第11期56-58,共3页 Electronic Components And Materials
基金 哈尔滨工程大学基础研究基金资助项目(HEUF04064)
关键词 无机非金属材料 锂锰氧化物 尖晶石 铬离子 正极材料 锂离子电池 non-metallic inorganic material lithium manganese oxide spinel Cr^3＋ Cathode material lithium-ion battery
分类号 TM912.9 [电气工程—电力电子与电力传动]
  • 相关文献

参考文献8

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共引文献45

同被引文献13

  • 1李琪,李飞,乔庆东.Li_(1+x)Mn_2O_4的合成及表征[J].石油化工高等学校学报,2004,17(4):22-25. 被引量：8
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电子元件与材料
2007年 第11期

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