Structure, Composition, and Electrochemistry of Chromium-Substituted ε-LiVOPO 4. Lee, K., Siu, C., Hidalgo, M., F., V., Rana, J., Zuba, M., Chung, Y., Omenya, F., Piper, L., F., J., Liu, H., Chernova, N., A., & Whittingham, M., S. ACS Applied Energy Materials, 4(2):1421-1430, 2, 2021. ![Structure, Composition, and Electrochemistry of Chromium-Substituted ε-LiVOPO 4 [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website doi abstract bibtex 9 downloads Lithium vanadyl phosphate (LiVOPO4) is an attractive cathode material for next-generation lithium-ion batteries, having the ability to reversibly intercalate two Li ions per transition metal redox center to reach a theoretical capacity of 305 mAh g-1. This material has a high energy density with two voltage plateaus of 2 and 4 V. However, reduced capacity retention at faster rates and sluggish kinetics in the high-voltage region leaves much room for improvement. Cr substitution was implemented to mitigate these limitations and enhance the electrochemical performance of ε-LiVOPO4. By various characterization techniques, we have established the composition of the hydrothermally synthesized Cr-substituted samples to be LixHyCrzV1-zOPO4 solid solution (0.80 ≤ x ≦ 0.85, 0.25 ≦ y ≦ 0.60, and z ≦ 0.05). All Cr-substituted samples demonstrated higher coulombic efficiency and superior cycling stability for over 40 cycles at C/15. Electrochemical tests show Cr substitution enhances the Li-ion diffusion in the high-voltage regime and the reaction reversibility of ε-LiVOPO4.
@article{
title = {Structure, Composition, and Electrochemistry of Chromium-Substituted ε-LiVOPO 4},
type = {article},
year = {2021},
keywords = {disordered structure,elemental substitution,high-energy density cathode,hydrothermal synthesis,lithium-ion batteries,livopo 4,multielectron redox},
pages = {1421-1430},
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abstract = {Lithium vanadyl phosphate (LiVOPO4) is an attractive cathode material for next-generation lithium-ion batteries, having the ability to reversibly intercalate two Li ions per transition metal redox center to reach a theoretical capacity of 305 mAh g-1. This material has a high energy density with two voltage plateaus of 2 and 4 V. However, reduced capacity retention at faster rates and sluggish kinetics in the high-voltage region leaves much room for improvement. Cr substitution was implemented to mitigate these limitations and enhance the electrochemical performance of ε-LiVOPO4. By various characterization techniques, we have established the composition of the hydrothermally synthesized Cr-substituted samples to be LixHyCrzV1-zOPO4 solid solution (0.80 ≤ x ≦ 0.85, 0.25 ≦ y ≦ 0.60, and z ≦ 0.05). All Cr-substituted samples demonstrated higher coulombic efficiency and superior cycling stability for over 40 cycles at C/15. Electrochemical tests show Cr substitution enhances the Li-ion diffusion in the high-voltage regime and the reaction reversibility of ε-LiVOPO4.},
bibtype = {article},
author = {Lee, Krystal and Siu, Carrie and Hidalgo, Marc F. V. and Rana, Jatinkumar and Zuba, Mateusz and Chung, Youngmin and Omenya, Fredrick and Piper, Louis F. J. and Liu, Hao and Chernova, Natasha A. and Whittingham, M. Stanley},
doi = {10.1021/acsaem.0c02634},
journal = {ACS Applied Energy Materials},
number = {2}
}
Downloads: 9
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