In-situ optical experiment and phase-field simulation of the effect of diaphragm on lithium electrodeposition
HE Jie
CHU Yuchen
WANG Shengke
Abstract：The relationship between the separator structure and the morphology evolution of lithium electrodeposition in lithium metal batteries is still unclear.The reaction mechanism can be revealed by in-situ experiments and numerical simulations.The morphology evolution of lithium electrodeposition can be observed directly by a home-made in-situ optic-electrochemical coupling device.In-situ experimental studies on three different separators revealed that glass fiber separator is more prone to lithium metal dendrite formation compared to polypropylene separators,while polypropylene and polyethylene composite separators exhibit more uniform lithium metal deposition morphology than the single-layer polypropylene separator.Scanning electron microscope images demonstrate distinct microstructures among the three separators.Combined with phase-field method numerical simulations,the results indicate that separator microstructures significantly influence lithium metal deposition morphology evolution and dendrite formation,with phase-field simulation outcomes aligning well with in-situ experimental observations.
Keywords：lithium metal batteryseparator structurein-situ experimentphase-field simulation
Publication Date：2026-02-25
Online Publishing Date：2026-03-13(First online date of this platform, not the publication date of the document)
Pages：5( 4-8 )