高能量密度电池中的活性颗粒的电化学-机械降解和失效:一篇评论

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Dawei Li¹, Chenhao Shen¹, Yuejiu Zheng¹

¹School of Mechanical Engineering, university of Shanghai for Science and Technology, Shanghai, 200093, China.

Small (Weinheim an der Bergstrasse, Germany)

|January 8, 2025

概括

离子电池中的活性粒子故障是由电化学和机械驱动的. 本综述探讨了降解,被动化层和机械应力,以指导开发更安全,更耐用,更高能量的电池.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
机械工程机械工程

背景情况:

高能量密度的离子电池对于现代技术至关重要.
活性电池颗粒的故障是主要的限制.
了解电化学-机械降解是提高电池性能的关键.

研究的目的:

在活性电池颗粒中全面审查电化学机械降解和故障机制.
为了突出消化层,高温和机械应力的影响.
为开发下一代电池提供指导方针,以提高安全性,耐用性和能量密度.

主要方法:

关于降解机制的文献综述.
对被动化层增长的分析 (例如,固体电解质间相 - SEI).
对电极材料的热效应和机械应力的检查.
讨论先进的表征技术 (冷性STEM,3D断层扫描).

主要成果:

像SEI这样的被动化层显著影响电池性能.
升高的温度加快了降解,导致容量减弱和阻力增加.
机械降解,包括颗粒断裂,会影响电极性能.
化学,机械和热因素的相互作用导致电池故障.

结论:

电化学机械因素对于活性粒子失效至关重要.
先进的表征揭示了结构和化学进化.
为改进电池的材料选择,化学开发和结构设计提出了指导方针.

关键词:

活性物质损失,活性物质损失.电化学 - 机械降解降解活动颗粒的故障.电池是电池的使用方式.被动化层增长增长的层.

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