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100 1 _ |a Liu, Haidong
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245 _ _ |a Truncated Octahedral High-Voltage Spinel LiNi 0.5 Mn 1.5 O 4 Cathode Materials for Lithium Ion Batteries: Positive Influences of Ni/Mn Disordering and Oxygen Vacancies
260 _ _ |a Pennington, NJ
|c 2018
|b Electrochemical Soc.
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520 _ _ |a Micron-sized truncated octahedral LiNi0.5Mn1.5O4 (LNMO) samples with different degrees of Ni/Mn disordering have been obtained by controlling the synthesis conditions, such as calcination atmosphere (O2 and air), cooling rate or additional annealing step. The influences of Ni/Mn disordering on the physical properties and electrochemical performance of the truncated octahedral LNMO samples have been systematically investigated. The analyses of thermogravimetry, X-ray photoelectron spectroscopy, X-ray diffraction, powder neutron diffraction, Raman spectroscopy and X-ray absorption spectroscopy reveal that the occurrence and degree of Ni/Mn disordering are closely related with the formation of oxygen vacancies and presence of Mn3+. Slow cooling rate and post-annealing can result in low degrees of Ni/Mn disordering and oxygen vacancies. Electrochemical measurements show that Ni/Mn disordering and oxygen vacancies have no obvious effect on the rate capability since all LNMO samples share a truncated octahedral morphology with the exposed {100} surfaces. However, they play significant roles in improving long-term cycling stability, especially at the elevated temperature of 60°C. This work suggests that the electrochemical performance of LNMO with optimized truncated morphology can be further enhanced through tuning the degrees of Ni/Mn disordering and oxygen vacancies.
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700 1 _ |a He, Xin
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700 1 _ |a Senyshyn, Anatoliy
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700 1 _ |a Wilken, Andrea
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700 1 _ |a Zhou, Dong
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700 1 _ |a Wang, Jun
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700 1 _ |a Winter, Martin
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700 1 _ |a Li, Jie
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773 _ _ |a 10.1149/2.1241809jes
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