通过 DEM 仿真解决电池电极因可逆膨胀而产生的应变和孔隙率变化问题

IF 3.1 4区 工程技术 Q2 ELECTROCHEMISTRY Journal of The Electrochemical Society Pub Date : 2024-08-29 DOI:10.1149/1945-7111/ad70d8
Hunter Teel, Taylor R. Garrick, Srikant Srinivasan, Fengkun Wang, Yangbing Zeng, Sirivatch Shimpalee
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引用次数: 0

摘要

在这项工作中,使用离散元素法 (DEM) 模拟来探测电极孔隙率、电极应变以及由活性材料和粘合剂颗粒组成的复合电极的压力变化。通过这些模拟获得的结果,我们捕捉到了电极运行的两种极限情况中的三种情况,以及运行期间电极面压力的一种实际情况,并讨论了其对设计和性能的影响。预测孔隙率的变化是一种独特的见解,通过实验很难甚至不可能捕捉到这种变化,但对于预测循环过程中电化学性能的变化却非常重要。
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Addressing Strain and Porosity Changes of Battery Electrodes Due to Reversible Expansion through DEM Simulations
In this work, discrete element method (DEM) simulations were used to probe changes in electrode porosity, electrode strain, and the resultant pressure changes for composite electrodes comprised of active material and binder particles. Through the results acquired by these simulations, three cases that are representative of two limiting cases for electrode operation, and one case for realistic electrode face pressure during operation were captured and the implications on design and performance are discussed. Predicting changes in the porosity is a unique insight that is difficult if not impossible to capture experimentally but is important for predicting changes in electrochemical performance during cycling, and should be addressed early on in the design phase for automotive and grid storage battery design and performance.
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来源期刊
CiteScore
7.20
自引率
12.80%
发文量
1369
审稿时长
1.5 months
期刊介绍: The Journal of The Electrochemical Society (JES) is the leader in the field of solid-state and electrochemical science and technology. This peer-reviewed journal publishes an average of 450 pages of 70 articles each month. Articles are posted online, with a monthly paper edition following electronic publication. The ECS membership benefits package includes access to the electronic edition of this journal.
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