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In vacuo XPS investigation of surface engineering for lithium metal anodes with plasma treatment

Journal of Energy Chemistry 2022年第3期31卷 295-305,I0009页

作者： Bo Zhao Jin Li Maxime Guillaume jolien dendooven Christophe Detavernier Department of Solid State Sciences COCOON Research GroupGhent UniversityKrijgslaan 281/S19000 GhentBelgium Solid State Battery Applicability Lab Research and InnovationSolvay SARue de Tansbeek 3101120 BrusselsBelgium

Lithium(Li)metal is an attractive anode material with high capacity(3860 mAh g^(−1))and low potential(−3.04 V *** hydrogen electrode)that shows highly promising for applications requiring high energy ***,the low electrochemical potential of Li metal makes it extremely reactive and inevitably forming a native oxidized layer in the ambient environment and repeatedly being consumed when exposed to liquid *** is therefore beneficial to replace the poorly controlled native passivation layer with a tailored artificial SEI to improve interface management between Li and electrolyte and enhance the stability of Li metal ***,we use an integrated glovebox-atomic layer deposition(ALD)-X-ray photoelectron spectroscopy(XPS)setup to in-situ investigating the pristine Li surface and the surface composition after Ar,H_(2)O_(2),N_(2)and NH_(3)plasma treatment *** find that the pristine Li foil is naturally being covered with a native oxidized layer,which is mainly composed of LiOH,Li_(2)O and Li_(2)CO_(3).These investigated plasmas can efficiently remove the oxidized layer from the Li metal surface,in which metallic Li surface is obtained after Ar or H2 plasma treatments,where Ar plasma is more *** O_(2)plasma treatment produces a Li_(2)O layer,and N_(2)or NH_(3)plasma treatment leads to a Li3N(including a certain amount of LiON)layer on the Li *** employing the representative metallic Li(by Ar plasma treatment),Li_(2)O layer coated Li(by O_(2)plasma treatment)and Li3N layer coated Li(by N_(2)plasma treatment)foils as electrodes in symmetric Li metal batteries,the Li3N coated Li electrode exhibits much higher stability than that of metallic and Li_(2)O layer coated Li *** electrochemical performance has also been achieved in LiMn_(2)O_(4)(LMO)||Li full cells using Li anode with Li3N protective coating *** work reveals the detailed process of surface engineering of Li metal anodes with plasma treat

关键词： Plasma treatment In vacuo XPS Lithium metal anode Metallic Li Li_(2)O layer Li_(3)N layer

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