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基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构
Alternative TitleInsight into fine structures of ${\rm{LiF}}{{\rm{e}}_x}{\rm{M}}{{\rm{n}}_{1 - x}}{{\rm{O}}_2}$ by synchrotron radiation-based X-ray absorption spectroscopy
吴桂贤; 赵海峰; 黄伟峰; 陶石; 张凌铭; 余蓁; 储旺盛; 韦世强
2017
Source PublicationJournal of University of Science and Technology of China中国科学技术大学学报
ISSN0253-2778
Volume47Issue:5Pages:369
SubtypeArticle
Abstract利用共沉淀法合成出了一系列化合物${\rm{LiF}}{{\rm{e}}_x}{\rm{M}}{{\rm{n}}_{1 - x}}{{\rm{O}}_2}\left({0 \le x \le 1} \right)$,电化学测试表明${\rm{LiF}}{{\rm{e}}_{0.25}}{\rm{M}}{{\rm{n}}_{0.75}}{{\rm{O}}_2}$可逆容量最高,当倍率为0.1C(1C=140 mA/g)时,可逆容量可达180 mAh/g.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线吸收谱(XAS)对所制备的材料的组成、形貌和精细结构进行了表征.XRD和XAS的结果显示${\rm{LiF}}{{\rm{e}}_x}{\rm{M}}{{\rm{n}}_{1 - x}}{{\rm{O}}_2}\left({0 < x < 1} \right)$含有三重晶体相即尖晶石相(${\rm{LiM}}{{\rm{n}}_2}{{\rm{O}}_4}$)、富锂相(${\rm{L}}{{\rm{i}}_2}{\rm{Mn}}{{\rm{O}}_3}$)和层状相(${\rm{LiFe}}{{\rm{O}}_2}$).另外,XAS结果证明材料中的Mn相和Fe相是随机堆叠的.该研究表明Fe的替代影响了晶体相的组成和Mn相的局域结构,进而调节了该正极材料的电化学性能,得到当$x = 0.25$时最优的电化学性能.
KeywordX射线吸收谱 锂离子电池 多重相 局域结构
Indexed ByCSCD
Language英语
WOS Research AreaChemistry (provided by Clarivate Analytics)
CSCD IDCSCD:6014784
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285318
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
吴桂贤,赵海峰,黄伟峰,等. 基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构[J]. Journal of University of Science and Technology of China中国科学技术大学学报,2017,47(5):369.
APA 吴桂贤.,赵海峰.,黄伟峰.,陶石.,张凌铭.,...&韦世强.(2017).基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构.Journal of University of Science and Technology of China中国科学技术大学学报,47(5),369.
MLA 吴桂贤,et al."基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构".Journal of University of Science and Technology of China中国科学技术大学学报 47.5(2017):369.
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