- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | SHI Wei, CHAI Jin, XIA Mingyuan. Characteristics Analysis of Lithium Metal Batteries with Ultra-High Energy Density under Pressure Conditions[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240033
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External pressure plays a crucial role in the performance of lithium metal batteries. In order to study the macroscopic performance and the microscopic lithium deposition characteristics of lithium metal batteries under different pressure conditions, the pressure test and scanning electron microscope (SEM) verification were conducted to verify that applying external pressure can improve the surface morphology of negative electrodes of lithium metal batteries. The nonlinear phase field model and the force model were coupled to reveal relevant mechanisms. The influence of non-pressure conditions on the deposition morphology and internal stress distribution of lithium was analyzed from the microscopic perspective. The results show that in the absence of external pressure, the external expansion of lithium metal batteries accelerates the continuous growth of lithium dendrites, which results in rapid capacity fading. According to the simulation data, as external pressure rises, the principal axis length of lithium dendrites decreases from 2.04 μm to 1.1 μm, and the aspect ratio increases from 0.32 to 0.79. The smooth and robust morphology evolution can significantly reduce the specific surface area of lithium dendrites, but at the same time, it increases the mechanical instability. The phases of lithium dendrites under different external pressures are displayed, which provides theoretical support for the pressure management and design of lithium metal batteries.
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Figures(20) / Tables(1)
XU Chengcheng, XU Fangchao, SUN Feng, ZHANG Xiaoyou, JIN Junjie, LUAN Boran. Micro-positioning Control of Magnetic Actuator for Electrical Discharge Machining[J]. Journal of Southwest Jiaotong University, 2022, 57(3): 610-617. doi: 10.3969/j.issn.0258-2724.20210987
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