Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/139557
Title: Manganese phosphate coated Li[Ni0.6Co0.2Mn0.2]O2 cathode material : towards superior cycling stability at elevated temperature and high voltage
Authors: Chen, Zhen
Kim, Guk-Tae
Guang, Yang
Bresser, Dominic
Diemant, Thomas
Huang, Yizhong
Copley, Mark
Behm, Rolf Jürgen
Passerini, Stefano
Shen, Zexiang
Keywords: Engineering::Chemical engineering
Issue Date: 2018
Source: Chen, Z., Kim, G.-T., Guang, Y., Bresser, D., Diemant, T., Huang, Y., . . . Shen, Z. (2018). Manganese phosphate coated Li[Ni0.6Co0.2Mn0.2]O2 cathode material : towards superior cycling stability at elevated temperature and high voltage. Journal of Power Sources, 402, 263-271. doi:10.1016/j.jpowsour.2018.09.049
Journal: Journal of Power Sources
Abstract: Nickel-rich Li[Ni0.6Co0.2Mn0.2]O2 is considered to be the next step forward towards the realization of high-energy lithium-ion batteries and has, thus, attracted intensive attention recently. However, achieving long-term cycling stability at elevated temperatures and voltages still remains a formidable challenge for practical applications. In this work, we successfully synthesized MnPO4-coated Li[Ni0.6Co0.2Mn0.2]O2 (MP-NCM) with an advantageously low coating content of only 1 wt% while providing substantially enhanced electrochemical performance and outstanding cycling stability. This improvement is ascribed to the MnPO4 coating, acting as an ideal protective layer to dramatically reduce the occurring side reactions with the electrolyte, especially at higher temperatures and cut-off voltages. By preventing the direct contact between the cathode active material and the electrolyte, the presence of the coating layer reduces the transition metal dissolution, thus, yielding good structural integrity upon cycling, while its amorphous nature allows for an enhanced apparent lithium ion diffusion, i.e., lithium de-/insertion kinetics. Additionally, the strong covalent bonding of the PO4-group contributes to an increased thermal stability and the high voltage performance of MP-NCM. On the basis of our work, the coating design strategy delivers valuable materials for the practical realization of lithium-ion batteries with superior long-term cycling stability at higher operation temperature and voltage.
URI: https://hdl.handle.net/10356/139557
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2018.09.049
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2018 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:ERI@N Journal Articles

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