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Synthetic Pathway Determines the Non-equilibrium Crystallography of Li- and Mn-rich Layered Oxides

preprint
submitted on 10.11.2020, 10:39 and posted on 11.11.2020, 05:44 by Ashok S. Menon, Seda Ulusoy, Dickson Ojwang, Lars Riekehr, Christophe Didier, Vanessa K. Peterson, Germán Salazar-Alvarez, Peter Svedlindh, Kristina Edström, Cesar Pay Gomez, William Brant
Li- and Mn-rich layered oxides show significant promise as electrode materials for future Li-ion batteries. However, accurate descriptions of its crystallography remain elusive, with both single-phase solid solution and multi-phase structures being proposed for high performing materials such as Li1.2Mn0.54Ni0.13Co0.13O2. Herein, we report the synthesis of single- and multi-phase variants of this material through sol-gel and solid-state methods, respectively, and conclusively demonstrate that its crystallography is a direct consequence of the synthetic route and not an inherent property of the composition, as previously argued. This was accomplished via complementary techniques that probe the bulk and local structure followed by in situ methods to map the synthetic progression. As the electrochemical performance and anionic redox behaviour is often rationalised on the basis of the presumed crystal structure, clarifying the structural ambiguities is an important step towards harnessing its potential as an electrode material.

Funding

This research is funded by the Swedish Foundation for Stra-tegic Research (SSF) within the Swedish national graduate school in neutron scattering (SwedNess). The authors also gratefully acknowledge funding from the Strategic Research Area StandUp for Energy and the Swedish Energy Agency. The Swedish research council, VR, is also acknowledged (Grant Nos: 349-2014-3946 and 2016-06959).

History

Email Address of Submitting Author

ashok.menon@kemi.uu.se

Institution

Uppsala University

Country

Sweden

ORCID For Submitting Author

0000-0001-8148-8615

Declaration of Conflict of Interest

The authors declare no competing financial interest

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