文献类型：期刊文献

英文题名：In-Situ and Ex-Situ Study on Li Plating Behavior of Libs Electrode Under Inhomogeneous External Load

作者：Yao, Yiming[1,2]; Sun, Min[1]; Chen, Ying[1]; Luan, Weiling[1]; Li, Hailong[2]; Chen, Haofeng[1,3]

机构：[1] Key Laboratory of Advanced Battery Systems and Safety [CPCIF], School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] School of Business, Society and Engineering, M?lardalen University, V?ster?s, 72123, Sweden; [3] Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, United Kingdom

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230403314)

语种：英文

外文关键词：Electrolytes - Graphite electrodes - Plating - Separators - Stress concentration

摘要：Lithium-ion batteries (LIBs) may experience inhomogeneous external loads due to manufacturing constraints and subsequent deformations during service life. Inhomogeneous external loads impart a stress field on the material, causing deformation. This deformation impacts electrolyte distribution and subsequently changes the local current density, resulting in Li plating. Hence, the impact of inhomogeneous external loads is often simplified to the relationship between porosity changes and liquid-phase transport properties, overlooking the direct influence of the stress field on lithium deposition mechanisms. This paper introduces an in-situ reaction cell designed to apply an inhomogeneous external load on the graphite electrode. As this cell is filled with electrolytes and lacks a separator, concerns regarding separator deformation and electrolyte loss are eliminated. Thus, in-situ optical observation vividly reveals the evolution of phase transformation and Li plating on the graphite electrode, confirming the impact of the stress field on Li plating. Unlike the mossy-type Li deposition that presents uniformly under an even load, dendrite-type lithium deposition preferentially grows in stress concentration areas induced by inhomogeneous external loads. This research offers fresh insights into the Li plating behavior, emphasizing the significance of stress fields from inhomogeneous external loads, to enhance the lifespan and safety of LIBs. ? 2023, The Authors. All rights reserved.