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题名: An O3-type NaNi0.5Mn0.5O2 cathode for sodium-ion batteries with improved rate performance and cycling stability
作者: Wang, Peng-Fei1, 2; You, Ya1, 2; Yin, Ya-Xia1, 2; Guo, Yu-Guo1, 2
刊名: JOURNAL OF MATERIALS CHEMISTRY A
发表日期: 2016
卷: 4, 期:45, 页:17660-17664
收录类别: SCI
英文摘要: Layered O3-type NaNi0.5Mn0.5O2 (space group: R (3) over barm) was synthesized by a sol-gel method, and subjected to electrochemical characterization for sodium-ion batteries (SIBs). A Na//NaNi0.5Mn0.5O2 cell can deliver a reversible capacity of 141 mA h g(-1) in the voltage range of 2.0-4.0 V and show a good capacity retention of 90% after 100 cycles. A highly reversible structural evolution of O3(hex.)-O3'(mon.)-P3(hex.)-P3'(mon.)-P3 ''(hex.) upon Na+ extraction and intercalation is demonstrated to be the key factor to its excellent cycling capability. Furthermore, the apparent diffusion coefficient of Na ions in the layered O3-type NaNi0.5Mn0.5O2 composite electrode can be effectively increased by using good conductive CNTs, which is demonstrated by cyclic voltammograms and the galvanostatic intermittent titration technique. Thus even at a high rate of 2C, the O3-NaNi0.5Mn0.5O2 cathode still exhibits a high reversible capacity of 80 mA h g(-1). The impressive sodium storage properties of O3-NaNi0.5Mn0.5O2 make it a promising candidate as a positive electrode material for rechargeable SIBs.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35720
Appears in Collections:分子纳米结构与纳米技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China
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