Effect of compaction on the internal resistance and electrochemical performance of LiFePO4/C-based batteries

The effect of compaction density on the performance of LiFePO4/C battery was studied. From the perspective of the distribution of each material of LiFePO4/C electrode pole pieces, the traditional oil-based electrode manufacturing process was used. Through scanning electron microscopy, physical property test, and electrochemical performance test, the effect of compressibility on compaction thickness and compaction density was studied. The electrode porosity was calculated, and the electrode model was constructed according to the surface morphology of pole piece. It indicates that there is a reasonable range of compaction density; too high or too low is harmful to the resistance of pole piece and the internal resistance of battery, affecting the electrochemical performance of battery. The optimal compaction density for this system is determined to be 2.6 g·cm− 3.