Date: 2024-11-19 hits: 179
A. Introduction
With the continuous advancement of technology, the performance requirements for lithium batteries are becoming increasingly high. This article provides a detailed introduction to the double-layer coating process for lithium batteries, with a focus on the design of the adhesive layer structure in this process and its impact on electrode performance and overall battery performance. Through a brief analysis of double-layer coating technology, its important role in improving the performance and stability of lithium batteries is elaborated, providing valuable reference for the development of the next generation of high-performance lithium batteries.
As an advanced electrode preparation process, double-layer coating technology has great potential in improving the performance of lithium batteries. Among them, the design of the layered structure of the adhesive is one of the key links in the double-layer coating process, which has a significant impact on the structural integrity, cycling stability, and electrochemical performance of the electrode.
B. Overview of double-layer coating process for lithium batteries
Double layer coating is a process of coating two different types of slurries on a current collector to form a double-layer electrode structure. This process can be designed and optimized for different layers of electrodes according to different needs. For example, the bottom layer slurry can focus on improving the adhesion between the electrode and the current collector, while the upper layer slurry can focus on improving the electrochemical performance of the electrode.
C. The Importance of Adhesive Layered Structure
（1） Adhesive migration problem: During the coating and drying process, the adhesive may migrate to the surface, especially when the coating thickness is large, which can lead to a weakening of the bonding force between the electrode and the current collector. During the cycling process, the electrodes may directly delaminate, seriously affecting the performance and safety of the battery.
（2） The significance of optimizing the distribution of binders can be effectively compensated for by designing a layered structure of binders, enhancing the structural integrity and cycling stability of electrodes. Meanwhile, a reasonable distribution of binders can also improve the electrochemical performance of electrodes and reduce polarization losses.
D. Design Method of Adhesive Layered Structure
（1） In a double-layer structure, high proportion SBR (styrene butadiene rubber) can be used to compensate for the migration of binders in the bottom slurry. SBR has good bonding performance, which can enhance the bonding force between the electrode and the current collector, and improve the structural stability of the electrode.
（2） Computational simulation optimization of electrode design can explore electrodes with gradient porosity design through methods such as computational simulation. This design can reduce the limitations of liquid-phase transport, decrease polarization losses, and thus improve the electrochemical performance of the battery. Meanwhile, computational simulation can also help optimize the distribution of adhesives and achieve precise design of adhesive layered structures.
E. Current research progress
The current research progress shows that by precisely controlling the distribution of binders and coating process parameters, the delamination problem of electrodes can be effectively improved, and the overall performance of lithium batteries can be enhanced.
F. Conclusion
The double-layer coating process for lithium batteries is a widely developed electrode preparation technology. The design of the layered structure of the adhesive plays a crucial role in this process, improving the performance and stability of the electrode through reasonable design.
