Digital‐Twin‐Driven Diagnostics of Crack Propagation in a Single LiNi0.7Mn0.15Co0.15O2 Secondary Particle during Lithium Intercalation

材料科学 纳米压痕 粒子(生态学) 复合材料 电化学 电极 物理化学 海洋学 地质学 化学
作者
Jihun Song,Seonghyeon Lim,Kyung‐Geun Kim,Nurzhan Umirov,Hyobin Lee,Cyril Bubu Dzakpasu,Jaejin Lim,Jieun Nam,Joonam Park,Je‐Nam Lee,Hirokazu Munakata,Kiyoshi Kanamura,Sung‐Soo Kim,Yong Min Lee
出处
期刊:Advanced Energy Materials [Wiley]
卷期号:13 (23) 被引量:4
标识
DOI:10.1002/aenm.202204328
摘要

Abstract Crack propagation has been extensively spotlighted as a main reason for the degradation of secondary‐particle‐type active materials, including LiNi x Mn y Co 1− x − y O 2 (NMC). Numerous experimental analyses and 3D‐modeling‐based investigations have been conducted to unravel this complicated phenomenon, especially for nickel‐rich NMCs, which experience substantial crack propagation during high‐voltage, high‐temperature, or high‐depth‐of‐discharge operations. To fundamentally clarify this unavoidable degradation factor and permit its suppression, a digital‐twin‐guided electro–chemo–mechanical (ECM) model of a single few‐micrometer‐sized LiNi 0.7 Mn 0.15 Co 0.15 O 2 (NMC711) particle is developed in this study using a 3D reconstruction technique. Because the digital twin technique replicates a real pore‐containing NMC711 secondary particle, this digital‐twin electrochemical model simulates voltage profiles even at 8C‐rate within an error of 0.48% by fitting two key parameters: diffusion coefficient and exchange current density. The digital‐twin‐based ECM model is developed based on the verified electrochemical parameters and mechanical properties such as lithium‐induced strain from axis lattice parameters and stress–strain curve measured by nanoindentation. Using this model, the electrochemical‐reaction‐induced mechanical properties including strain, stress, and strain energy density are also visualized in operando in a single NMC711 particle. Finally, the advanced operando ECM analysis allows for the diagnosis of crack formation, highlighting the effectiveness of this platform in elucidating crack formation in active materials.
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