固态锂金属电池界面机械失效中空隙缺陷的电化学-力学演化机制

IF 3.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Xinyi Zou, Zhipeng Yin, Tong Xu, Hao Feng, Zhongming Li*, Jiangqi Zhou* and Chengwei Ma*, 
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引用次数: 0

摘要

固态锂金属电池因其高能量密度和安全性而成为高能量密度电池系统最有前途的候选者。然而,固体电解质与锂金属阳极之间不光滑的固-固界面导致界面接触不良,导致镀锂不均匀和锂枝晶渗透,从而导致界面机械失效。本文通过建立二维电化学力学多物理场耦合模型,研究了金属锂析出对固体电解质空洞缺陷界面力学破坏的影响机理。高离子电导率的LLZO界面空穴缺陷处的锂金属表现出较小的Von Mises应力,有利于抑制垂直于界面方向的锂枝晶生长。低离子电导率的LLZO界面空洞缺陷表现出较大的局部等效应变,空洞内部平行于界面方向的损伤区域更窄,更有利于保护固体电解质。当界面反应处于低反应速率和高扩散速率时,对应R≥1,界面处形成稳定沉积。通过将堆积压力调节到30-60 MPa,可以有效偏转和阻止锂枝晶的生长。该工作为固态锂金属电池界面工程提供了科学的理论指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Lithium Metal Electrochemical-Mechanical Evolution Mechanism of Void Defects for Interface Mechanical Failure in Solid-State Lithium Metal Batteries

The Lithium Metal Electrochemical-Mechanical Evolution Mechanism of Void Defects for Interface Mechanical Failure in Solid-State Lithium Metal Batteries

Solid state lithium metal batteries are the most promising candidates for high-energy density battery systems due to their high energy density and safety characteristics. However, the incomplete smooth solid–solid interface between the solid electrolyte and the lithium metal anode leads to poor interface contact, resulting in uneven lithium plating and lithium dendrite penetration, which in turn causes mechanical failure of the interface. Herein, the effect mechanism of lithium metal evolution on interface mechanical failure in solid electrolyte void defects was investigated by establishing a two-dimensional electrochemical mechanical multiphysics coupling model. The lithium metal at the interface void defect of LLZO with high ionic conductivity exhibits small Von Mises stress, which is conducive to suppressing the growth of lithium dendrites perpendicular to the interface direction. The LLZO interface void defect with low ionic conductivity exhibits large local equivalent strain, and the damage area parallel to the interface direction inside the void is narrower, which is more conducive to protecting the solid electrolyte. Moreover, when the interface reaction is at a low reaction rate and high diffusion rate, corresponding to R ≥ 1, stable deposition is formed at the interface. By regulating the stacking pressure to 30–60 MPa, it can effectively deflect and prevent the growth of lithium dendrites. This work provides scientific theoretical guidance for interface engineering of solid-state lithium metal batteries.

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来源期刊
Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research 工程技术-工程:化工
CiteScore
7.40
自引率
7.10%
发文量
1467
审稿时长
2.8 months
期刊介绍: ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.
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