阳极
锂(药物)
阴极
电解质
透射电子显微镜
扫描电子显微镜
制作
电池(电)
扫描透射电子显微镜
电化学
材料科学
表征(材料科学)
快离子导体
电子能量损失谱
纳米技术
化学
化学工程
作者
Dhamodaran Santhanagopalan,Danna Qian,Thomas McGilvray,Ziying Wang,Feng Wang,Fernando Camino,Jason Graetz,Nancy J. Dudney,Ying Shirley Meng
摘要
Understanding the role of interfaces is important for improving the performance of all-solid-state lithium ion batteries. To study these interfaces, we present a novel approach for fabrication of electrochemically active nanobatteries using focused ion beams and their characterization by analytical electron microscopy. Morphological changes by scanning transmission electron microscopy imaging and correlated elemental concentration changes by electron energy loss spectroscopy mapping are presented. We provide first evidence of lithium accumulation at the anode/current collector (Si/Cu) and cathode/electrolyte (LixCoO2/LiPON) interfaces, which can be accounted for the irreversible capacity losses. Interdiffusion of elements at the Si/LiPON interface was also witnessed with a distinct contrast layer. These results highlight that the interfaces may limit the lithium transport significantly in solid-state batteries. Fabrication of electrochemically active nanobatteries also enables in situ electron microscopy observation of electrochemical phenomena in a variety of solid-state battery chemistries.
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