期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 13, 期 6, 页码 913-919出版社
SPRINGER
DOI: 10.1007/s10008-008-0628-x
关键词
Lithium ion battery; Cathode material; LiMn1.4Cr0.2Ni0.4O4; LiNi0.5Mn1.5O4; Electrochemical property
Spinel LiNi0.5Mn1.5O4 and LiMn1.4Cr0.2Ni0.4O4 cathode materials have been successfully synthesized by the sol-gel method using citric acid as a chelating agent. The structure and electrochemical performance of these as-prepared powders have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and the galvanostatic charge-discharge test in detail. XRD results show that there is a small Li (y) Ni1-y O impurity peak placed close to the (4 0 0) line of the spinel LiNi0.5Mn1.5O4, and LiMn1.4Cr0.2Ni0.4O4 has high phase purity, and the powders are well crystallized. SEM indicates that LiMn1.4Cr0.2Ni0.4O4 has a slightly smaller particle size and a more regular morphological structure with narrow size distribution than those of LiNi0.5Mn1.5O4. Galvanostatic charge-discharge testing indicates that the initial discharge capacities of LiMn1.4Cr0.2Ni0.4O4 and LiNi0.5Mn1.5O4 cycled at 0.15 C are 129.6 and 130.2 mAh g(-1), respectively, and the capacity losses compared to the initial value, after 50 cycles, are 2.09% and 5.68%, respectively. LiMn1.4Cr0.2Ni0.4O4 cathode has a higher electrode coulombic efficiency than that of the LiNi0.5Mn1.5O4 cathode, implying that Ni and Cr dual substitution is beneficial to the reversible intercalation and de-intercalation of Li+.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据