Lithium Spatial Distribution and Split-Off Electronic Bands at Nanoscale V2O5/LiPON Interfaces

覆盖层 X射线光电子能谱 材料科学 分析化学(期刊) 异质结 阴极 电解质 锂(药物) 阴极发光 电化学 溅射 电极 发光 化学 纳米技术 光电子学 薄膜 核磁共振 物理化学 医学 物理 色谱法 内分泌学
作者
Zach Levy,Victoria Castagna Ferrari,Pablo Rosas,Mitchell J. Walker,Kalpak Duddella,Micah Haseman,David M. Stewart,Gary W. Rubloff,L. J. Brillson
出处
期刊:ACS applied energy materials [American Chemical Society]
卷期号:6 (9): 4538-4548
标识
DOI:10.1021/acsaem.2c03683
摘要

A combination of depth-resolved cathodoluminescence spectroscopy (DRCLS) and X-ray photoemission depth profiling (XPS) measured the pronounced changes in both the electronic density of states and lithium composition near the nanoscale LixV2O5/LiPON interface. DRCLS studies of electrochemically lithiated bare V2O5 and the sputter-deposited V2O5 plus LiPON overlayer electrochemically lithiated in stages both showed that in the bulk the luminescence intensity of the "split-off" hybridized bonding density of states was anticorrelated with XPS-measured Li content, decreasing as the Li content increased. However, the LiPON overlayer was found to modify the band structure of the underlying LixV2O5 (LVO) to a depth of at least 30 nm beneath the V2O5 interface. DRCLS spectra near the electrochemically lithiated LiPON/LVO interface showed a significant intensity of the split-off band, implying a low Li content. However, XPS depth profiling revealed a pronounced negative gradient of Li extending from a maximum Li content at the intimate LiPON boundary to its lowest content of ∼30 nm into the V2O5 in the same region, indicating a strong interaction between band structure and Li electrochemical potential near this heterojunction. These results provide evidence for substantial effects on the local band structure near an electrolyte/cathode interface and insights into the electrochemical interface behavior of solid-state batteries in general.

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