Inelastic shape changes of silicon particles and stress evolution at binder/particle interface in a composite electrode during lithiation/delithiation cycling

被引:49
作者
Wang, Hailong [1 ]
Nadimpalli, Siva P. V. [2 ]
Shenoy, Vivek B. [1 ]
机构
[1] Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USA
[2] New Jersey Inst Technol, Dept Mech & Ind Engn, Newark, NJ 07102 USA
基金
美国国家科学基金会;
关键词
Plastic deformation of lithiated Si; Binder/particle interface stress; Composite electrode model; Li-ion battery; Stress-diffusion; Finite element method; LITHIUM-ION BATTERIES; THIN-FILM ELECTRODES; PLASTIC-DEFORMATION; ELECTROCHEMICAL PERFORMANCE; MECHANICAL-PROPERTIES; NEGATIVE ELECTRODES; STRUCTURAL-CHANGES; POLYACRYLIC-ACID; HIGH-CAPACITY; SI FILMS;
D O I
10.1016/j.eml.2016.03.020
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Inelastic shape changes of Si particles and stress evolution at binder/particle interface was modeled using coupled diffusion-stress framework available in finite element software. A simple model that contains two spherical Si particles with and without the polymer binder film was used to represent the composite electrode. The particles were lithiated and delithiated at two different rates: one representing a slow charging case which results in a uniform Li concentration throughout the Si particles and the other representing a fast charging condition which results in non-uniform lithium concentration within the spherical Si particles. The inelastic shape changes and associated contact forces predicted by the model are qualitatively consistent with experimental data. Further, the effect of binder mechanical properties and the binder fraction on the stress evolution in Si particles and at the binder/particle interface was calculated. The proposed model, although simple, can guide a battery design engineer to choose a proper binder, charge/discharge strategy, and binder fraction for a durable electrode design. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:430 / 438
页数:9
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