扫描电化学显微镜技术在锂离子电池分析中的研究进展

Research progresses of the analytical applications of scanning electrochemical microscopy in Li-ion batteries

扫描电化学显微镜(SECM)是一种基于超微电极电化学的原位分析技术,它将一支可以进行三维方向移动的超微盘电极作为工作探针沉浸在电解质溶液中,在离基底约几微米的位置进行扫描,通过探针上的电流变化来反映基底的形貌和性质。SECM有多种工作模式且具有电化学响应速度快、时空分辨率高、对样品进行非接触测试等优点,在锂离子电池分析中有着重要应用。本文简要介绍SECM的工作原理以及主要工作模式,并阐述了SECM在锂离子电池正极材料和负极材料原位分析中的研究进展。其中SECM在正极材料的研究中主要应用于充放电的过程中Li^+的嵌入和脱出过程动力学及机理的研究,在负极材料方面主要针对充放电过程中负极材料表面SEI膜的形成过程及性质进行研究。

Scanning electrochemical microscopy （SECM） is a kind of in-situ analysis technology based on electrochemical principle of ultra-micro electrode. It used the ultra-micro-disc electrode which can move toward three dimensional directions as working probe immersed in the electrolyte solution. As scanning at a few micro meters from the basal position, the varied probe currents can reflect the morphology and properties of the substrate. SECM has several operations modes, and benefit from fast electrochemical responses with high spatial and temporal resolution at non-invasive detection mode, which enables the technology applicated in analysis of Li-ion batteries. This paper mainly introduced the theory and working modes of SECM, and reviewed the research progresses of in situ analysis of SECM in cathode and anode materials in lithium ion batteries. Particularly, SECM analysis of cathode materials mainly focused on kinetics of intercalation/deintercalation of Li＋ and its mechanism during charging/discharging processes. On the anode side, the progress of SECM applications in the formation processes and properties of solid electrolyte interface （SEI） are mainly reviewed in this paper.