标题:LiNi0.5Mn1.5O4nanostructures with two-phase intergrowth as enhanced cathodes for lithium-ion batteries
作者:Zhu, Xiaobo ;Li, Xiaona ;Zhu, Yongchun ;Jin, Shasha ;Wang, Yan ;Qian, Yitai
作者机构:[Zhu, Xiaobo ;Li, Xiaona ;Zhu, Yongchun ;Jin, Shasha ;Wang, Yan ;Qian, Yitai ] Hefei National Laboratory for Physical Science at Microscale, Departmen 更多
通讯作者:Zhu, Y
来源:Electrochimica Acta
出版年:2014
卷:121
页码:253-257
DOI:10.1016/j.electacta.2013.12.176
摘要:LiNi0.5Mn1.5O4(LNMO) nanostructures (microspheres composed of nanoparticles) are prepared from urchin-like γ-MnO2by calcinating under 800 C, the product shows Fd3m-based phase involving minor rock salt phase and Mn3+ions confirmed by its Raman spectra, X-ray diffraction pattern and electrochemical activities. Furthermore, HRTEM images and EDS line-scanning spectroscopy patterns focusing on a single nanoparticle provide direct observation of intergrowth of two phases that minor P4332 phase is found on the edge of Fd3 m body coupled with the varying Mn/Ni ratio. In comparison, the other sample is obtained by adding an annealing treatment at 700 C after calcinating at 800 C, which preserves the nanostructured architecture of C800 and displays all the structural characteristics of pure P4332 phase. As cathode materials for lithium-ion batteries, merely calcined sample receives discharge capacities of 91 mAh•g-1even at 50 C, and 100.5 mAh•g-1after 300 cycles at 5 C, which shows better combination of rate and cycling performances than its counterpart with pure P4332 phase. © 2014 Elsevier Ltd.
收录类别:EI
资源类型:期刊论文
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