Manganese based layered oxides with modulated electronic and thermodynamic properties for sodium ion batteries

Kai Zhang, Duho Kim, Zhe Hu, Mihui Park, Gahee Noh, Yujeong Yang, Jing Zhang, Vincent Wing-hei Lau, Shu-Lei Chou, Maenghyo Cho, Si-Young Choi and Yong-Mook Kang ()
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Kai Zhang: Dongguk University-Seoul
Duho Kim: Seoul National University
Zhe Hu: University of Wollongong
Mihui Park: Dongguk University-Seoul
Gahee Noh: POSTECH
Yujeong Yang: POSTECH
Jing Zhang: Dongguk University-Seoul
Vincent Wing-hei Lau: Dongguk University-Seoul
Shu-Lei Chou: University of Wollongong
Maenghyo Cho: Seoul National University
Si-Young Choi: POSTECH
Yong-Mook Kang: Dongguk University-Seoul

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Manganese based layered oxides have received increasing attention as cathode materials for sodium ion batteries due to their high theoretical capacities and good sodium ion conductivities. However, the Jahn–Teller distortion arising from the manganese (III) centers destabilizes the host structure and deteriorates the cycling life. Herein, we report that zinc-doped Na0.833[Li0.25Mn0.75]O2 can not only suppress the Jahn–Teller effect but also reduce the inherent phase separations. The reduction of manganese (III) amount in the zinc-doped sample, as predicted by first-principles calculations, has been confirmed by its high binding energies and the reduced octahedral structural variations. In the viewpoint of thermodynamics, the zinc-doped sample has lower formation energy, more stable ground states, and fewer spinodal decomposition regions than those of the undoped sample, all of which make it charge or discharge without any phase transition. Hence, the zinc-doped sample shows superior cycling performance, demonstrating that zinc doping is an effective strategy for developing high-performance layered cathode materials.

Date: 2019
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DOI: 10.1038/s41467-018-07646-4

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