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

doi:10.3969/j.issn.0253-2778.2017.05.001

Journal of University of Science and Technology of China ›› 2017, Vol. 47 ›› Issue (5): 369-376.DOI: 10.3969/j.issn.0253-2778.2017.05.001

• Original Paper • Next Articles

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).

Abstract

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

CLC Number:

O611.4

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

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