Issue 2, 2023

A Li-rich strategy towards advanced Mn-doped triphylite cathodes for Li-ion batteries

Abstract

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.

Graphical abstract: A Li-rich strategy towards advanced Mn-doped triphylite cathodes for Li-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
23 Okt. 2022
Accepted
23 Dec. 2022
First published
17 Janv. 2023
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2023,2, 328-337

A Li-rich strategy towards advanced Mn-doped triphylite cathodes for Li-ion batteries

E. E. Nazarov, A. D. Dembitskiy, I. A. Trussov, O. A. Tyablikov, I. S. Glazkova, S. V. Alexey, I. A. Presniakov, I. V. Mikheev, A. V. Morozov, V. A. Nikitina, A. M. Abakumov, E. V. Antipov and S. S. Fedotov, Energy Adv., 2023, 2, 328 DOI: 10.1039/D2YA00292B

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