کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
800707 1467448 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The coupled lithium ion diffusion and stress in battery electrodes
ترجمه فارسی عنوان
توزیع یون لیتیوم و استرس در الکترودهای باتری
کلمات کلیدی
الکترود باتری، انتشار یون جنبش سطحی، ظرفیت باتری، تنش منتشر شده همراه است
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی

The electrochemical processes in Li-ion batteries are rather complicated, making the insight and guidance from the modeling and simulations essential for the design and optimization of novel electrodes. In this study a continuum model that couples diffusion and mechanics of ion intercalation in electrodes is presented, based on the entropy and mechanical energy associated with the intercalation of ions. The chemical potential difference across the electrode–electrolyte interface is used as the activation energy under the Arrhenius type of kinetics, complemented by governing equation of mechanical equilibrium. The model is implemented into COMSOL finite element platform, and graphite electrodes are used as case studies. It is found that the geometry and topology of the electrodes have important effects on the kinetics as well as capacity of the electrodes, as they have substantial influence on the stress distribution induced by Li-ion intercalation. Higher compressive stress results in lower ion concentration and thus lower capacity, and it also reduces the diffusion rate. As a result, structured electrodes with higher surface area and relaxed stress state tend to have higher capacity and faster rate performance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanics of Materials - Volume 91, Part 2, December 2015, Pages 343–350
نویسندگان
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