阳极
X射线光电子能谱
材料科学
法拉第效率
介电谱
扫描电子显微镜
电化学
分析化学(期刊)
锂(药物)
化学工程
电极
复合材料
化学
医学
物理化学
色谱法
工程类
内分泌学
作者
Deliang He,Minjuan Yuan,Bo Hu,Chunlong Zou,Xuyang Zhao,Chunrong Zhao,Jiantao Wang,Haiyang Ding
出处
期刊:Journal of physics
[IOP Publishing]
日期:2024-01-01
卷期号:2679 (1): 012005-012005
标识
DOI:10.1088/1742-6596/2679/1/012005
摘要
Abstract The effects of pressures on electrochemical performance, micro-morphology, surface elemental valence, and cell impedance of nano-silica-based anode all-solid-state lithium batteries (ASLBs) are investigated in this study. The cell under various applied pressures is measured using electrochemical charge/discharge tests, X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance test (EIS), and X-ray spectroscopy (XPS). The results indicate that the first cycle lithium insertion capacity reaches its highest value of 3554.5 mAh·g −1 when the Si-based anode undergoes charge and discharge at a rate of 0.1C under a pressure of 100 MPa. Moreover, the coulombic efficiency (CE) at a pressure of 300 MPa reaches a high value of 92.67%, which significantly surpasses the 88.11% under 100 MPa. Meanwhile, higher pressure significantly enhances the cycling performance of Si-based anode, with a capacity of 2268 mAh·g −1 after 100 cycles of charging and discharging at 0.3C under 300 MPa, and a capacity retention rate of 80.21%. SEM images and XPS demonstrated that higher pressures block Si expansion and inhibit crack formation in the Si-based anode, and meanwhile the lower pressure would lead to severe decomposition of Li 6 S 5 Cl in the electrode after long-term cycling and hence resulting in more SEI generation in the Si-based anode. The XPS results demonstrate that. The EIS test results show that the impedance of solid-state batteries is lower under a pressure of 300 MPa, indicating an improved interface of the ASLBs.
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