Unravelling the Mechanism of Pulse Current Charging for Enhancing the Stability of Commercial LiNi0.5Mn0.3Co0.2O2/Graphite Lithium-Ion Batteries

Jia Guo, Yaolin Xu*, Moritz Exner, Xinrong Huang, Yongchun Li, Yanchen Liu, Hui Wang, Julia Kowal, Qi Zhang, Peter Kjær Kristensen, Deyong Wang, Kjeld Pedersen, Leonid Gurevich, Daniel-Ioan Stroe*, Philipp Adelhelm

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

The key to advancing lithium-ion battery (LIB) technology, particularly with respect to the optimization of cycling protocols, is to obtain comprehensive and in-depth understanding of the dynamic electrochemical processes during battery operation. This work shows that pulse current (PC) charging substantially enhances the cycle stability of commercial LiNi 0.5Mn 0.3Co 0.2O 2 (NMC532)/graphite LIBs. Electrochemical diagnosis unveils that pulsed current effectively mitigates the rise of battery impedance and minimizes the loss of electrode materials. Operando and ex situ Raman and X-ray absorption spectroscopy reveal the chemical and structural changes of the negative and positive electrode materials during PC and constant current (CC) charging. Specifically, Li-ions are more uniformly intercalated into graphite and the Ni element of NMC532 achieves a higher energy state with less Ni─O bond length variation under PC charging. Besides, PC charging suppresses the electrolyte decomposition and continuous thickening of the solid-electrolyte-interphase (SEI) layer on graphite anode. These findings offer mechanistic insights into Li-ion storage in graphite and NMC532 and, more importantly, the role of PC charging in enhancing the battery cycling stability, which will be beneficial for advancing the cycling protocols for future LIBs and beyond.

OriginalsprogEngelsk
TidsskriftAdvanced Energy Materials
Vol/bindn/a
Udgave nummern/a
Sider (fra-til)2400190
Antal sider14
ISSN1614-6832
DOI
StatusUdgivet - 2024

Emneord

  • NMC532/graphite
  • aging mechanism
  • lithium-ion batteries
  • operando characterization
  • pulse current charging

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