Research progress of heterogeneous microstructure and performance correlation during calendering process of electrode for LIBs
In the context of striving to achieve the"dual-carbon"strategy goal of"carbon peak and carbon neutrality",battery energy storage technology has become an important direction for China's automotive industry transformation and sustainable economic growth.As the core component of the battery,the electrode determines the energy density and service safety of the battery,and the calendering process is a key factor in ensuring the required compaction density of the electrode and improving the comprehensive performance of the battery.However,due to the typical layered composite structure of the electrode,which consists of a coating-collector-coating structure with porous and compressible properties and involves the interaction between active particles and particle-current collector,it has haterogeneous characteristics.The deformation mechanism during the calendering process is extremely complex,and controlling the thickness is difficult,which significantly affects subsequent performance.This article provides an overview of the research progress on the fundamental theories,basic mechanisms,and performance of the calendering process for electrode.It contributes to a deeper understanding of the correlation between the calendering-microstructure-performance of anode and cathode electrode,offering guidance for predicting the forward performance of electrode,designing reverse process and microstructure,optimizing calendering process settings and improving the quality of electrode products.
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