TY - JOUR
T1 - Enhancing electrochemical performance of nickel-rich NCM cathode material through Nb modification across a wide temperature range
AU - Ren, Jincan
AU - Liu, Zhengbo
AU - Tang, Yu
AU - Yin, Zijia
AU - Yang, Tingting
AU - Huang, Zhiyong
AU - Wang, Wei
AU - Cui, Wenwen
AU - Zhang, Chunxia
AU - Shen, Zesheng
AU - Liu, Yingxia
AU - Ren, Yang
AU - Liu, Qi
PY - 2024/6/30
Y1 - 2024/6/30
N2 - LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.6) possessing a high nickel content is a favorable cathode candidate for next-generation lithium-ion batteries (LIBs) owing to its ultra-high energy density. However, its sluggish electrochemical kinetics at low temperatures and severe structure destruction at high temperatures limit its practical application. This study presents a facile surface modification strategy based on niobium (Nb) to achieve LiNbO3 coating and Nb5+ doping, which can address both problems under extreme temperatures (-30-50 °C). More specifically, the LiNbO3 coating layer can decrease polarization and charge transfer resistance and enhance the structural stability of nickel-rich NCM (LiNi0·83Co0·12Mn0·05O2); Nb5+ dopants can widen the lithium-ion migration channels and thus improve the diffusion kinetics. The Nb-modified NCM (Nb-NCM) exhibits a high discharge specific capacity at subzero temperatures and excellent stability throughout the temperature range. To further evaluate the practical application potential of the Nb-NCM electrode, full cells are fabricated and tested using the Nb-NCM as a cathode and Li4Ti5O12 (LTO) as an anode. Encouragingly, the full cell also shows excellent electrochemical performance between −30 and 50 °C. These findings provide a facile and scalable strategy to enhance the electrochemical performance of nickel-rich NCM across a broad temperature range. © 2024 Published by Elsevier B.V.
AB - LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.6) possessing a high nickel content is a favorable cathode candidate for next-generation lithium-ion batteries (LIBs) owing to its ultra-high energy density. However, its sluggish electrochemical kinetics at low temperatures and severe structure destruction at high temperatures limit its practical application. This study presents a facile surface modification strategy based on niobium (Nb) to achieve LiNbO3 coating and Nb5+ doping, which can address both problems under extreme temperatures (-30-50 °C). More specifically, the LiNbO3 coating layer can decrease polarization and charge transfer resistance and enhance the structural stability of nickel-rich NCM (LiNi0·83Co0·12Mn0·05O2); Nb5+ dopants can widen the lithium-ion migration channels and thus improve the diffusion kinetics. The Nb-modified NCM (Nb-NCM) exhibits a high discharge specific capacity at subzero temperatures and excellent stability throughout the temperature range. To further evaluate the practical application potential of the Nb-NCM electrode, full cells are fabricated and tested using the Nb-NCM as a cathode and Li4Ti5O12 (LTO) as an anode. Encouragingly, the full cell also shows excellent electrochemical performance between −30 and 50 °C. These findings provide a facile and scalable strategy to enhance the electrochemical performance of nickel-rich NCM across a broad temperature range. © 2024 Published by Elsevier B.V.
KW - Electrochemical kinetics
KW - Li-ion batteries
KW - Nickel-rich cathode
KW - Structure stability
KW - Wide temperature
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85190880872&origin=recordpage
U2 - 10.1016/j.jpowsour.2024.234522
DO - 10.1016/j.jpowsour.2024.234522
M3 - RGC 21 - Publication in refereed journal
SN - 0378-7753
VL - 606
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 234522
ER -