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Materials 2018, 11(5), 806; https://doi.org/10.3390/ma11050806

Electrochemical and Electronic Charge Transport Properties of Ni-Doped LiMn2O4 Spinel Obtained from Polyol-Mediated Synthesis

1
Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany
2
Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany
3
Institute for Combustion Technology, RWTH Aachen University, 52056 Aachen, Germany
4
Institute of Energy and Climate Research IEK-9: Fundamental Electrochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany
5
Institute of Physical Chemistry, RWTH Aachen University, 52074 Aachen, Germany
*
Authors to whom correspondence should be addressed.
Received: 18 April 2018 / Revised: 9 May 2018 / Accepted: 14 May 2018 / Published: 16 May 2018
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Abstract

LiNi0.5Mn1.5O4 (LNMO) spinel has been extensively investigated as one of the most promising high-voltage cathode candidates for lithium-ion batteries. The electrochemical performance of LNMO, especially its rate performance, seems to be governed by its crystallographic structure, which is strongly influenced by the preparation methods. Conventionally, LNMO materials are prepared via solid-state reactions, which typically lead to microscaled particles with only limited control over the particle size and morphology. In this work, we prepared Ni-doped LiMn2O4 (LMO) spinel via the polyol method. The cycling stability and rate capability of the synthesized material are found to be comparable to the ones reported in literature. Furthermore, its electronic charge transport properties were investigated by local electrical transport measurements on individual particles by means of a nanorobotics setup in a scanning electron microscope, as well as by performing DFT calculations. We found that the scarcity of Mn3+ in the LNMO leads to a significant decrease in electronic conductivity as compared to undoped LMO, which had no obvious effect on the rate capability of the two materials. Our results suggest that the rate capability of LNMO and LMO materials is not limited by the electronic conductivity of the fully lithiated materials. View Full-Text
Keywords: Lithium-ion battery; LiNi0.5Mn1.5O4 spinel; DFT calculations; rate capability; electrical conductivity Lithium-ion battery; LiNi0.5Mn1.5O4 spinel; DFT calculations; rate capability; electrical conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yang, S.; Schmidt, D.O.; Khetan, A.; Schrader, F.; Jakobi, S.; Homberger, M.; Noyong, M.; Paulus, A.; Kungl, H.; Eichel, R.-A.; Pitsch, H.; Simon, U. Electrochemical and Electronic Charge Transport Properties of Ni-Doped LiMn2O4 Spinel Obtained from Polyol-Mediated Synthesis. Materials 2018, 11, 806.

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