Summary:

This patent pertains to the field of electrochemical energy storage; more specifically, it focuses on an aqueous low-tortuosity thick electrode, including its preparation and application. The preparation process encompasses several critical steps, including slurry mixing, coating, freezing, vacuum drying, and rolling. By carefully controlling the freezing process—specifically, the longitudinal temperature gradient and the surface temperature of the electrode—the prepared electrode features a straight channel from the top to the bottom, resulting in an electrode tortuosity of 1 or approximately 1. This patent aims to effectively address the problems of cracking in traditional thick electrodes and the delamination failure of the coating films from current collectors. Additionally, it establishes efficient lithium-ion transmission channels and electronic conductivity networks, thereby reducing concentration polarization in thick electrodes and enhancing battery rate performance.

Link: http://epub.cnipa.gov.cn/patent/CN115692615A