Enhanced Cycling Performance of Fe-doped LiMn2O4 Truncated Octahedral Cathodes for Li-Ion Batteries
- 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
- Issue Date
- Jun-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Fe doping; Jahn-Teller distortion; LiMn2O4; Lithium-ion batteries; Truncated octahedron
- Citation
- CHEMELECTROCHEM, v.9, no.11
- Journal Title
- CHEMELECTROCHEM
- Volume
- 9
- Number
- 11
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42406
- DOI
- 10.1002/celc.202200385
- ISSN
- 2196-0216
- Abstract
- 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 similar to 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.
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