Investigation on mechanical and microstructural evolution of lithium-ion battery electrode during the calendering process
Investigation on mechanical and microstructural evolution of lithium-ion battery electrode during the calendering process
复制标题
锂离子电池电极压延过程中力学和微观结构演变的研究
DOI：
10.1016/j.powtec.2022.117828
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发表时间：
2022
影响因子：
5.2
通讯作者：
Jing
中科院分区：
文献类型：
--
作者：
Jun;Hua;Jing
为了增加电池容量并提高电子传导性和电化学性能，锂离子电池电极采用压延工艺生产。这项工作旨在揭示压延过程中力学和微观结构的演变，同时导出预测模型来确定厚度和孔隙率。这里，采用离散元方法模拟和压延实验来分析微观和宏观响应。使用赫克尔方程补充了预测模型。此外，电极是在增量线负载下制造的。根据电极形貌，总结其变形机理：颗粒粉碎、二次颗粒融合、粘结剂网络压缩和集流体表面变形。电子电导率的提高，一方面与电极内部导电路径的改善有关，另一方面与涂层与集流体之间接触的紧密程度有关
To increase battery capacity and improve electronic conductivity and electrochemical performance, lithium-ion battery electrodes are produced using a calendering process. This work aims to reveal the evolution of mechanics and microstructure during the calendering process, while a predictive model was derived to determine the thickness and porosity. Here, the discrete element method simulations and calendering experiments were adopted to analyze the microscale and macroscale responses. A predictive model was supplemented using the Heckel equation. Furthermore, the electrodes were manufactured under incremental line load. According to the electrode morphology, the deformation mechanism was summarized: Particle pulverization, secondary particle fusion, binder network compression and the current collector's surface deformation. The increase of the electronic conductivity is related, on the one hand, to the conductive path inside the electrode being improved and, on the other hand, to the tightening of the contact between the coating and the current collector