Enhanced Cycling Performance of Fe‐doped LiMn2O4 Truncated Octahedral Cathodes for Li‐Ion Batteries

LiMn2O4 (LMO) with a spinel crystal structure is a promising cathode for next‐generation Li‐ion batteries (LIBs), owing to its low cost and high operating voltage of ∼4.4 V. However, due to the Jahn‐Teller distortion effect, LMO typically exhibits deteriorated cycling performance, owing to the disso...

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Published inChemElectroChem Vol. 9; no. 11
Main Authors Lee, Seong‐Nam, Park, Deok‐Hye, Kim, Ji‐Hwan, Moon, Sang‐Hyun, Jang, Jae‐Sung, Kim, Sung‐Beom, Shin, Jae‐Hoon, Park, Yu‐Yeon, Park, Kyung‐Won
Format Journal Article
LanguageEnglish
Published Weinheim John Wiley & Sons, Inc 14.06.2022
Subjects
Cathodes
Crystal structure
Cycles
Electrochemical impedance spectroscopy
Electron microscopy
Fe doping
Ion diffusion
Jahn-Teller distortion
LiMn2O4
Lithium manganese oxides
Lithium-ion batteries
Manganese
Photoelectrons
Titration
Truncated octahedron
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Summary:LiMn2O4 (LMO) with a spinel crystal structure is a promising cathode for next‐generation Li‐ion batteries (LIBs), owing to its low cost and high operating voltage of ∼4.4 V. However, due to the Jahn‐Teller distortion effect, LMO typically exhibits deteriorated cycling performance, owing to the dissolution of Mn into a liquid electrolyte. In this study, Fe‐doped truncated octahedral LMO cathodes with different concentrations were synthesized to improve LMO stability in LIBs. The Fe‐doped truncated octahedral LMO was characterized using X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. The Li+ ion diffusion coefficients of the cathodes were measured using electrochemical impedance spectroscopy and the galvanostatic intermittent titration technique. Compared to the truncated octahedral undoped LMO, the Fe‐doped LMO cathode with an appropriate amount of dopant exhibited the best LIB performance, with the highest Li+ ion diffusivity resulting from the increased oxygen vacancy as the path of Li+ ion. Fe‐doped truncated octahedral LiMn2O4: LiMn2O4 (LMO) cathodes with different concentrations were synthesized to improve LMO stability in lithium‐ion batteries (LIBs). Compared to the truncated octahedral undoped LMO, the Fe‐doped LMO cathode with an appropriate amount of dopant exhibited the best LIB performance due to the increased oxygen vacancy as the path of Li+ ion.
ISSN:2196-0216
2196-0216
DOI:10.1002/celc.202200385