Improving the Interfacial Stability between Lithium and Solid-State Electrolyte via Dipole-Structured Lithium Layer Deposited on Graphene Oxide

Advanced Science
Muqin WangDeyu Wang

Abstract

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-Cu2O-GO, CCG), a composite Li anode enables a high coulombic efficiency above 99.5% over 120 cycles for an SSB using Li10GeP2S12 SSE and LiCoO2 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 ...Continue Reading

References

Feb 8, 2008·Nature·M Armand, J-M Tarascon
Aug 26, 2017·Nature Communications·Xin-Bing ChengYury Gogotsi
Nov 22, 2017·Physical Chemistry Chemical Physics : PCCP·Bingbing ChenLiquan Chen
Jun 14, 2018·ACS Applied Materials & Interfaces·Pengcheng ShiWu Xu
Aug 29, 2018·Journal of the American Chemical Society·Jeffrey LopezZhenan Bao

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Citations

Jun 13, 2020·ACS Applied Materials & Interfaces·Zhenggang ZhangDeyu Wang

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Methods Mentioned

BETA
X‐ray

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