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锂离子蓄电池LiNi1／3Co1／3Mn1／3O2正极材料的性能表征 被引量：6

Properties characterization of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode materials for Li-ion batteries
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摘要 采用共沉淀法制备了层状Li1.05Ni1/3Co1/3Mn1/3O2正极材料。以C为负极,在1C、2.75～4.2V下的初始放电比容量达145.5mAh·g-1,循环100次后容量保持率为98.4%。并采用X光电子能谱(XPS)、循环伏安法(CV)和交流阻抗法(EIS)对层状LiNi1/3Co1/3Mn1/3O2材料中的各元素氧化态分布和嵌/脱锂动力学过程进行了系统研究。XPS实验结果表明LiNi1/3Co1/3Mn1/3O2中Co,Ni,Mn的主要氧化态分别为+3,+2,+4价,还有少量的Ni3+和Mn3+,并从晶体场理论解释了其氧化态分布机制。而LiNi1/3Co1/3Mn1/3O2的循环伏安曲线上主要存在3.95V氧化峰和3.69V还原峰,分别对应于Ni2+/Ni4+的氧化还原反应。 The layered LiNi1/3Co1/3Mn1/3O2 cathode material was synthesized by the chemical co-precipitation method. The initial discharge capacity of C/LiNi1/3Co1/3Mn1/3O2 was 145.5 mAh·g^-1, and the capacity of C/LiNi1/3Co1/3Mn1/3O2 retained 98.4% after 100 cycles （2.75-4.2 V, 1 C rate）. Properties of LiNi1/3Co1/3Mn1/3O2 cathode materials were studied by X-ray photoelectron spectroscopy（XPS）, cyclic voltammetry（CV） test and electrochemical impedance spectroscopy （EIS） measurements. XPS studies show that the predominant oxidation states of Co, Ni, Mn in the compound are ＋3, ＋2, ＋4 respectively, with small content of NP^＋ and Mn^3＋. Meantime the reason was demonstrated with the theory of crystalline field. Cyclic voltammetry （CV） test shows that the major oxidation peak at 3.95 V and reduction peak at 3.69 V correspond to the redox process of Ni^2＋/Ni^4＋couple.
作者 禹筱元 余仕僖 胡国荣 彭忠东 刘业翔
机构地区 华南农业大学理学院 中南大学冶金科学与工程学院
出处 《电源技术》 CAS CSCD 北大核心 2008年第10期655-658,共4页 Chinese Journal of Power Sources
基金 广东省自然科学基金(06300397) 华南农业大学校长基金(K06143)
关键词 锂离子蓄电池 LiNi1/3Co1/3Mn1/3O2正极材料 X光电子能谱 循环伏安法 交流阻抗法 lithium ion battery LiNi1／3Co1／3Mn1／3O2 cathode material X-ray photoelectron spectroscopy（XPS） cyclic voltammetry（CV） electrochemical impedance spectroscopy（EIS）
分类号 TM912.9 [电气工程—电力电子与电力传动]
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参考文献11

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共引文献9

同被引文献35

  • 1韦旎妮,赖琼钰,高媛,陈元端,卢集政.层状LiCo_(1/3)Ni_(1/3)Mn_(1/3)O_2正极材料的合成及电化学性能研究[J].无机化学学报,2005,21(7):999-1003. 被引量：30
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引证文献6

二级引证文献6

电源技术
2008年 第10期

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