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Aging‐Driven Composition and Distribution Changes of Electrolyte and Graphite Anode in 18650‐Type Li‐Ion Batteries
Author(s) -
Petz Dominik,
Baran Volodymyr,
Peschel Christoph,
Winter Martin,
Nowak Sascha,
Hofmann Michael,
Kostecki Robert,
Niewa Rainer,
Bauer Michael,
MüllerBuschbaum Peter,
Senyshyn Anatoliy
Publication year - 2022
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202201652
Subject(s) - electrolyte , materials science , anode , lithium (medication) , graphite , calorimetry , neutron diffraction , differential scanning calorimetry , thermal decomposition , ion , decomposition , chemical engineering , analytical chemistry (journal) , electrode , composite material , diffraction , thermodynamics , chromatography , chemistry , organic chemistry , medicine , physics , engineering , optics , endocrinology
A series of low‐temperature studies on LiNi 0.80 Co 0.15 Al 0.05 O 2 18650‐type batteries of high‐energy type with different stabilized states of fatigue is carried out using spatially resolved neutron powder diffraction, infrared/thermal imaging, and quasi‐adiabatic calorimetry. In‐plane distribution of lithium in the graphite anode and frozen electrolyte in fully charged state is determined non‐destructively with neutron diffraction and correlated to the introduced state of fatigue. An independent electrolyte characterization is performed via calorimetry studies on variously aged 18650‐type lithium‐ion batteries, where the shape of the thermodynamic signal is evolving with the state of fatigue of the cells. Analyzing the liquid electrolyte extracted/harvested from the studied cells reveals the decomposition of conducting salt to be the main driving factor for fatigue in the electrolyte degradation.