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

• DOI: 10.1002/aenm.202400190
• Publication Date: 2024-03-14T11:56:10Z
• Authors: Jia Guo; Yaolin Xu; Moritz Exner; Xinrong Huang; Yongchun Li; Yanchen Liu; Hui Wang; Julia Kowal; Qi Zhang; Peter Kjær Kriste...; Deyong Wang; Kjeld Pedersen; Leonid Gurevich; Daniel‐Ioan Stroe; Philipp Adelhelm
• Keywords: Operando Characterization; info:eu-repo/classification/ddc/050; lithium-ion batteries; 050; NMC532/graphite; 600 Technik, Medizin, angewandte Wissenschaften::600 Technik::600 Technik, Technologie; Lithium-Ion Batteries; /dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energy; name=SDG 7 - Affordable and Clean Energy; Aging Mechanisms; aging mechanism; lithium‐ion batteries; pulse current charging; operando characterization; Pulse Current Charging

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