Open AccessImproving the Interfacial Stability between Lithium and Solid‐State Electrolyte via Dipole‐Structured Lithium Layer Deposited on Graphene Oxide
Author(s) -
Wang Muqin,
Peng Zhe,
Luo Wenwei,
Zhang Qiang,
Li Zhendong,
Zhu Yun,
Lin Huan,
Cai Liangting,
Yao Xiayin,
Ouyang Chuying,
Wang Deyu
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202000237
Subject(s) - materials science , graphene , anode , oxide , electrolyte , lithium (medication) , faraday efficiency , cathode , sulfide , atomic layer deposition , chemical engineering , layer (electronics) , inorganic chemistry , nanotechnology , electrode , chemistry , metallurgy , medicine , engineering , endocrinology
Utilization of lithium (Li) metal anode in solid‐state batteries (SSBs) with sulfide solid‐state electrolyte (SSE) is hindered by the instable Li/SSE interface. A general solution to solve this problem is to place an expensive indium (In) foil between the SSE and Li, while it decreases the output voltage and thus the energy density of the battery. In this work, an alternative strategy is demonstrated to boost the cycling performances of SSB by wrapping a graphene oxide (GO) layer on the anode. According to density functional theory results, initial deposition of a thin Li layer on the defective GO sheets leads to the formation of a dipole structure, due to the electron‐withdrawing ability of GO acting on Li. By incorporating GO sheets in a nanocomposite of copper‐cuprous oxide‐GO (Cu‐Cu 2 O‐GO, CCG), a composite Li anode enables a high coulombic efficiency above 99.5% over 120 cycles for an SSB using Li 10 GeP 2 S 12 SSE and LiCoO 2 cathode, and the sulfide SSE is not chemically decomposed after cycling. The highest occupied molecule orbital/lowest unoccupied molecular orbital energy gap of this Li/GO dipole structure likely stretches over those of Li and sulfide SSE, enabling stabilized Li/SSE interface that can replace the expensive In layer as Li protective structure in SSBs.