In:
Energy Advances, Royal Society of Chemistry (RSC), Vol. 2, No. 2 ( 2023), p. 328-337
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 LiFePO 4 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 57 Fe Mössbauer spectroscopy. The particularly created defect structure of the Li-rich Li 1+ δ (Fe 0.5 Mn 0.5 ) 1− δ PO 4 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.
Type of Medium:
Online Resource
ISSN:
2753-1457
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
3168416-6
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