LIB Capacity x4, Longevity x2

Abstract

Li-ion batteries (LiBs) are the predominant energy storage system for electrical vehicles (EVs) as well as various consumer electronic devices. Their key attributes are long-term performance stability, good rate capability, and thermal stability in practical use. However, one of the most critical challenges of the present commercial Li-ion batteries is insufficient capacity leading to a need for frequent charging. Hence, the development of new electrode materials with higher energy density is of significant interest. Silicon and tin as anode and sulfur as cathode have 3~10 times higher theoretical capacities than the present Li-ion battery electrodes; graphite anode and lithium metal oxides cathodes. However, the stability of high-capacity materials and system are still poor due to large volume expansion (Si and Sn) and dissolution of intermediate compounds (sulfur). In the presentation, I will introduce the method to increase the stability of the battery materials and systems using in-situ surface treatment techniques for formation of high-quality solid electrolyte interphase.