Diffusion induced stresses in buckling battery electrodes

被引:58
作者
Bhandakkar, Tanmay K. [1 ]
Johnson, Harley T. [1 ]
机构
[1] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA
关键词
Three-dimensional electrode; Intercalation-deintercalation; Diffusion-induced stress; Lithium electrodes; Elastic-plastic deformation; Buckling; ELECTROCHEMICAL LITHIATION; SILICON; FRACTURE; CAPACITY; FILM; DEFORMATION; ANODES; MODEL; PERFORMANCE; GENERATION;
D O I
10.1016/j.jmps.2012.02.012
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Highly networked nanostructured battery electrode materials offer the possibility of achieving both rapid battery charge-discharge rates and high storage capacity. Recently, lithium ion battery (LIB) electrodes based on a 2-D honeycomb architecture were shown to undergo remarkable and reversible morphological changes during the lithiation process. Charge-discharge rates in 3-D composite electrode have also been shown to benefit from sandwiching the electrolytically active material between highly conductive ion and electron transport pathways to reduce electrical resistance and solid-state diffusion lengths. In the present work we simulate and analyze the observed morphological changes in honeycomb electrodes, with and without the presence of conductive pathways, during the lithiation-delithiation process. Diffusion induced stresses are analyzed for such structures undergoing elastic-plastic deformation during cycling. The results show that such a periodic, nanostructured electrode geometry allows for the presence of buckling-like deformation modes, which effectively reduce the resulting mechanical stresses that lead to electrode failure. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1103 / 1121
页数:19
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