Enhancing electrochemical performance of nickel-rich NCM cathode material through Nb modification across a wide temperature range

Jincan Ren, Zhengbo Liu, Yu Tang, Zijia Yin, Tingting Yang, Zhiyong Huang, Wei Wang, Wenwen Cui, Chunxia Zhang, Zesheng Shen, Yingxia Liu, Yang Ren, Qi Liu*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number234522
JournalJournal of Power Sources
Volume606
Online published23 Apr 2024
DOIs
Publication statusPublished - 30 Jun 2024

Funding

This study was supported by the National Key R&D Program of China (2020YFA0406203), the Shenzhen Science and Technology Innovation Commission (SGDX2019081623240948, JCYJ20200109105618137), the ECS scheme (CityU 21307019), City University of Hong Kong (grant No. 9610533) and the Shenzhen Research Institute. And we would like to acknowlege the funding support ( 9360157 ) from Hong Kong Institute for Advanced Study.

Research Keywords

  • Electrochemical kinetics
  • Li-ion batteries
  • Nickel-rich cathode
  • Structure stability
  • Wide temperature

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