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.

Electrically active/inert dual‐function architecture enabled by screen printing grid‐like SiO2 on Cu foil for ultra‐long life lithium metal anodes

“…Replacing planar Cu-foil current collectors (CCs) with three-dimensional (3D) porous scaffolds represents an efficient approach of simultaneously suppressing dendrites and alleviating the volume change of Li. [18][19][20][21][22][23][24] However, the development of high-energy LMBs requires the use of lightweight and thin 3D CCs for seeking more portable carrying. Existing 3D CCs made from metal-or carbon-based porous structures are generally too heavy (typically tens of mg cm À2 ) or too thick (tens to hundreds of micrometers), rendering practical applications challenging.…”