Electrode Assembly Coating Layout for N/P Ratio Stability

The insulating coating layer is applied selectively to specific regions of the positive electrode active material layer, creating local quality differences. The coating covers areas where N/P ratio reversal is most likely to occur, while leaving other areas uncovered to maintain high capacity utilization. This localized approach prevents lithium ion deposition at critical interfaces without sacrificing overall battery capacity.

Instead of uniform coating, the insulating coating layer is applied only to specific regions where N/P ratio reversal is most likely to occur, such as near the separator interface. This selective coating approach prevents lithium ion deposition at critical locations while leaving the majority of the positive electrode active material layer uncovered, thereby maintaining high capacity utilization and minimizing capacity loss.

The insulating coating layer is applied locally to specific regions of the positive electrode where N/P ratio reversal occurs, rather than increasing the overall N/P ratio across the entire electrode. This localized approach maintains the original N/P ratio and maximizes the reaction area between electrodes, while still preventing lithium ion deposition at the critical coated regions where safety issues arise.