基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构

doi:10.3969/j.issn.0253-2778.2017.05.001

中国科学技术大学学报 ›› 2017, Vol. 47 ›› Issue (5): 369-376.DOI: 10.3969/j.issn.0253-2778.2017.05.001

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基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构

吴桂贤，赵海峰，黄伟峰，陶石，张凌铭，余蓁，储旺盛，韦世强

1．中国科学技术大学国家同步辐射实验室，安徽合肥 230026；
2．中国科学院高能物理研究所，北京同步辐射装置，北京 100049；
3．北京大学工程学院，高能电池材料理论技术重点实验室，北京 100871

收稿日期:2016-02-24 修回日期:2016-04-14 出版日期:2017-05-31 发布日期:2017-05-31

Insight into fine structures of LiFexMn1-xO2 by synchrotron radiation-based X-ray absorption spectroscopy

WU Guixian, ZHAO Haifeng, HUANG Weifeng, TAO Shi,

ZHANG Lingming, YU Zhen, CHU Wangsheng, WEI Shiqing

Received:2016-02-24 Revised:2016-04-14 Online:2017-05-31 Published:2017-05-31
Contact: CHU Wangsheng
About author:WU Guixian, female, born in 1991, master. Research field: energy storage and conversion material. E-mail: guixian@mail.ustc.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China (11179001, 11275227).

摘要/Abstract

摘要： 利用共沉淀法合成出了一系列化合物LiFexMn1-xO2 (0≤x≤1)，电化学测试表明LiFe0.25Mn0.75O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LiFexMn1-xO2 (0<x<1)含有三重晶体相即尖晶石相(LiMn2O4)、富锂相(Li2MnO3)和层状相(LiFeO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.

关键词: X射线吸收谱, 锂离子电池, 多重相, 局域结构

Abstract: LiFexMn1-xO2 (0≤x≤1) compounds were synthesized by the co-precipitation method. Electrochemical tests show that the LiFe0.25Mn0.75O2 composite has a maximum reversible capacity of 180 mAh/g at 0.1 C(1 C=140 mA/g). These as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray absorption spectroscopy (XAS). XRD and XAS results show that the LiFexMn1-xO2 (0<x<1) samples actually have multiple crystal phases， especially the spinel phase (LiMn2O4), Li-rich phase (Li2MnO3) and layered phase (LiFeO2). Moreover, XAS reveals that the Mn-phase and the Fe-phase are randomly stacked in the samples. The work shows the doping of Fe influences the crystal phase and local structure of the Mn-phase upon the samples and then adjusts the electrochemical performances of the cathode materials, giving an optimal proportion (x=0.25) of the spinel and Li-rich and layered phase.

Key words: X-ray absorption spectroscopy, lithium ion batteries, multiple phases, local structure

中图分类号:

O611.4

吴桂贤，赵海峰，黄伟峰，陶石，张凌铭，余蓁，储旺盛，韦世强. 基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构[J]. 中国科学技术大学学报, 2017, 47(5): 369-376.

WU Guixian, ZHAO Haifeng, HUANG Weifeng, TAO Shi,. Insight into fine structures of LiFexMn1-xO2 by synchrotron radiation-based X-ray absorption spectroscopy[J]. Journal of University of Science and Technology of China, 2017, 47(5): 369-376.

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基于同步辐射的X射线吸收谱探讨LiFexMn1-xO2的精细结构

Insight into fine structures of LiFexMn1-xO2 by synchrotron radiation-based X-ray absorption spectroscopy

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