TY - JOUR
T1 - Pressure effects on the charge carrier transportation of polycrystalline LiCr0.35Mn0.65O2
AU - Hu, Tingjing
AU - Cui, Xiaoyan
AU - Yang, Jie
AU - Han, Yonghao
AU - Liu, Hongwu
AU - Gao, Chunxiao
AU - Du, Fei
AU - Chen, Gang
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/5
Y1 - 2011/5
N2 - LiCr0.35Mn0.65O2 powders were investigated by using in situ impedance spectroscopy under high pressure. The impedance spectroscopy of the Nyquist representation showed two overlapped arcs in the complex impedance plane which corresponded to the electrical transportation of grain and grain boundary respectively. By using the representation of Z ″/f versus Z ', the resistance and the relaxation frequency of grain and grain boundary were obtained under different pressures. It was found that at every phase transition region, both the resistance and the relaxation frequency of grain and grain boundary changed discontinuously. Pressure decreases the effective scattering section of grain and grain boundary to the charge carriers obviously and makes their transport easier. The variation of defects in the grain boundary region leads the sample resistance in the decompression process is much lower than that in the compression process. This indicates the pressure treatment has a positive contribution to the electrochemical performance of LiCr0.35Mn0.65O2.
AB - LiCr0.35Mn0.65O2 powders were investigated by using in situ impedance spectroscopy under high pressure. The impedance spectroscopy of the Nyquist representation showed two overlapped arcs in the complex impedance plane which corresponded to the electrical transportation of grain and grain boundary respectively. By using the representation of Z ″/f versus Z ', the resistance and the relaxation frequency of grain and grain boundary were obtained under different pressures. It was found that at every phase transition region, both the resistance and the relaxation frequency of grain and grain boundary changed discontinuously. Pressure decreases the effective scattering section of grain and grain boundary to the charge carriers obviously and makes their transport easier. The variation of defects in the grain boundary region leads the sample resistance in the decompression process is much lower than that in the compression process. This indicates the pressure treatment has a positive contribution to the electrochemical performance of LiCr0.35Mn0.65O2.
KW - Carrier transportation
KW - Diamond anvil cell
KW - Effective scattering section
KW - In situ impedance spectroscopy
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U2 - 10.1002/pssc.201000608
DO - 10.1002/pssc.201000608
M3 - Article
AN - SCOPUS:79955619455
VL - 8
SP - 1672
EP - 1675
JO - Physica Status Solidi C: Conferences
JF - Physica Status Solidi C: Conferences
SN - 1862-6351
IS - 5
ER -