Multi-Textured Structure Cathode Materials to Accommodate the Fast Charging for Lithium Secondary Batteries

Abstract

Small-sized portable electronic devices have been lead the lithium secondary battery industry to this day. In recent years, demands for lithium secondary batteries in the field of electrified vehicles have increased sharply, and this is about to overtake the demand from the conventional fields such as portable electronics. As the battery size gets larger, a charging time is getting more important especially in automobile sectors. The rapid kinetics must be satisfied at both electrodes simultaneously in a lithium secondary cell under increased charging current in order to reduce the charging time. Spinel and olivine materials were suggested as high rate materials for positive electrodes, however those materials have the limitation of lower energy density compared to layered structure one. In this study, a specially designed hydroxide precursor with NCM chemistry was synthesized by using a conventional co-precipitation method. The hydroxide precursor has a multi-textured structure of a dense sphere encapsulated with a porous layer. The final product synthesized with this precursor was evaluated as an active material for a positive electrode under fast charging conditions. The details of results will be presented including physico-chemical and electrochemical properties of the precursor and final product at the meeting.