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富锂锰基材料xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2(x = 0.3,0.5,0.7)的电化学和同步辐射研究; Electrochemical and in situ X-ray Absorption Fine Structure Study of Li-Rich Cathode Materials
侯孟炎 ; 鲍洪亮 ; 王珂 ; 王建强 ; 夏永姚 ; HOU Meng-yan ; BAO Hong-liang ; WANG Ke ; WANG Jian-qiang ; XIA Yong-yao
刊名http://electrochem.xmu.edu.cn/CN/abstract/abstract10280.shtml
2016-06-28
关键词富锂层状氧化物 正极材料 锂离子电池 原位X射线吸收谱 lithium-rich layered oxides cathode material lithium-ion battery in situ X-ray absorption fine structure
英文摘要采用共沉淀的方法,以过渡金属硫酸盐为起始物质制备了一系列不同组成的富锂锰基正极材料xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2(x = 0.3,0.5,0.7),通过XRD、Rietveld精修等物理手段比较了不同组成材料的结构特征. 通过对比不同比例材料的首周库仑效率、放电可逆容量、循环性能、电压降现象及不同温度下各比例富锂材料的倍率表现等电化学性能,确定 0.5Li2MnO3•0.5LiMn1/3Ni1/3Co1/3O2为该系列材料的最优比例. 然后采用原位X射线吸收谱技术,对富锂材料在首周活化过程中的机理进行了研究. 同步辐射结果表明,在首周充电过程中,镍和钴的价态分别从+2、+3价氧化到+4价,而对于锰来讲,虽然在富锂锰基材料活化的过程中其周围的局域电子结构发生了一定的变化,但是其化合价始终维持在+4价没有发生变化.; A series of the lithium-rich and manganese-based layered structure xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2 (x = 0.3,0.5,0.7) materials were synthesized by a co-precipitation method, and followed by a solid-state reaction process. By comparing the first cycle efficiency, the reversible discharge capacity, the cycling stability and the voltage decay during the charge/discharge cycling process, the material with the composition of 0.5Li2MnO3•0.5LiMn1/3Ni1/3Co1/3O2was found to show the best electrochemical performance. The lithium storage mechanism and thermal stability of the de-lithiated compound were also investigated by in situ X-ray absorption fine structure (XAFS) spectroscopy and differential scanning calorimetry (DSC) techniques. The results of XAFS indicates that during the charging process to 4.5 V, the Ni and Co ions are oxidized to Ni4+ and Co4+, respectively, while the Mn ion remains Mn4+.; 国家自然科学基金项目(No. 2011CB935903)和上海市科委项目(No. 13JC1407900)资助; 作者联系地址:1. 复旦大学化学系,上海 200433;2. 中科院上海应用物理研究所,上海 201800; Author's Address: 1.Department of Chemistry, Fudan University, Shanghai, 200433, China; 2. Shanghai Institute of Applied Physics, CAS, Shanghai, 201800; 通讯作者E-mail:wangjianqiang@sinap.ac.cn; yyxia@fudan.edu.cn
语种中文
出版者厦门大学《电化学》编辑部
内容类型期刊论文
源URL[http://dx.doi.org/10.13208/j.electrochem.151248]  
专题2016年第22卷
推荐引用方式
GB/T 7714
侯孟炎,鲍洪亮,王珂,等. 富锂锰基材料xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2(x = 0.3,0.5,0.7)的电化学和同步辐射研究, Electrochemical and in situ X-ray Absorption Fine Structure Study of Li-Rich Cathode Materials[J]. http://electrochem.xmu.edu.cn/CN/abstract/abstract10280.shtml,2016.
APA 侯孟炎.,鲍洪亮.,王珂.,王建强.,夏永姚.,...&XIA Yong-yao.(2016).富锂锰基材料xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2(x = 0.3,0.5,0.7)的电化学和同步辐射研究.http://electrochem.xmu.edu.cn/CN/abstract/abstract10280.shtml.
MLA 侯孟炎,et al."富锂锰基材料xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2(x = 0.3,0.5,0.7)的电化学和同步辐射研究".http://electrochem.xmu.edu.cn/CN/abstract/abstract10280.shtml (2016).
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