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A Li-rich strategy towards advanced Mn-doped triphylite cathodes for Li-ion batteriesстатья
- Авторы: Nazarov Eugene E., Dembitskiy Artem D., Trussov Ivan A., Tyablikov Oleg A., Glazkova Iana S., Alexey Sobolev V., Presniakov Igor A., Mikheev Ivan V., Morozov Anatolii V., Nikitina Victoria A., Abakumov Artem M., Antipov Evgeny V., Fedotov Stanislav S.
- Журнал: Energy Advances
- Год издания: 2023
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/d2ya00292b
- Аннотация: Triphylite-structured lithium iron/manganese phosphates have captured rapt attention as prospective positive electrodes for Li-ion batteries, targeted to automotive applications. Here we report on a strategy to improve the power characteristics of Mn-doped LiFePO4 cathode materials by introducing extra Li at the transition metal site (Li-rich) via a facile solvothermal synthesis route. The crystal structure refinement based on joint synchrotron and neutron powder diffraction data unambiguously confirmed the formation of a Li-rich phase, with additional validation coming from scanning transmission electron microscopy, electron energy loss spectroscopy, and 57Fe Mössbauer spectroscopy. The particularly created defect structure of the Li-rich Li1+δ(Fe0.5Mn0.5)1−δPO4 with additional Li+ ions residing at the 3d-metal site enables the extended solid solution region of the Li ion de/intercalation mechanism established using operando synchrotron X-ray powder diffraction. The suggested strategy offers an advanced electrochemical behavior of the materials that exhibit specific capacities of over 158 mAh g−1 at C/10 and 120 mAh g−1 at 10C, with retention of 84 ± 4% after 500 cycles at 10C.
- Добавил в систему: Михеев Иван Владимирович