Journal
ELECTROCHEMISTRY
Volume 88, Issue 2, Pages 79-82Publisher
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.19-00057
Keywords
Lithium-ion Battery; Graphite; Solid Electrolyte Interphase; Solvent Co-intercalation
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To prolong durability of lithium-ion batteries, stability of solid electrolyte interphase (SEI) formed at a graphite negative electrode should be improved, but the correlation of the SEI stability with the graphite structure is still unclear. This study focused on co-intercalation of dimethoxyethane (DME) into SEI-covered graphitized carbon nanosphere (GCNS) to investigate SEI degradation behavior. In situ Raman spectroscopy revealed that both ethylene carbonate (EC)-derived and propylene carbonate (PC)-derived SEIs partly passivated the DME co-intercalation, but the PC-derived SEI degraded more rapidly than the EC-derived one. Additionally, the SEI at GCNS heat-treated at 2900 degrees C had less stability than that at GCNS heat-treated at 2600 degrees C, which is attributable to the graphite layer stacking and surface morphology. (C) The Electrochemical Society of Japan, All rights reserved.
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