In situ tailoring solid electrolyte interphase of three-dimensional Li
metal electrode for enhanced Coulombic efficiency
Abstract
Although three-dimensional (3D) host is effective in restricting Li
dendrite growth, problems associated with the unstable
electrode/electrolyte interphase becomes more severe due to increased
interfacial area that is intrinsic of the 3D structures, being a major
cause for the low Coulombic efficiency.While building a desirable solid
electrolyte interphase (SEI) serves as an effective solution to improve
the electrode/electrolyte interfacial stability, the 3D nature of the
electrode makes the task challenging.Herein,we demonstrated the in-situ
formation of SEI on chemically/structurally modified carbon cloth that
is used as the 3D host.We shown that ZnS/ZnO nanotube arrays uniformly
grown on the carbon cloth served as precursors for the in-situ formation
of Li2S/Li2O/LiZn containing artificial SEI. While Li2S and Li2O are
preferred components in SEI, Zn functions as lithiophilic site that
guides the uniform lithium deposition.The present work shed light on
effective design strategies for SEI formation on 3D electrode host with
controllable SEI composition.