Optimizing Electrode Efficiency in Lithium Titanate: Investigating the Impact of Electrolyte Additives on Cylindrical Li‐Ion Capacitor Cells

Abstract

Recent advancements in lithium‐based energy storage focus on new electrode materials for lithium‐ion batteries (LIBs) and capacitors. Lithium titanate (LTO) emerges as a key player, offering minimal volume change, rapid charging, and enhanced safety. A critical discovery is the formation of a solid electrolyte interphase (SEI) layer on LTO electrodes, especially with electrolyte additives, improving electrochemical performance. This study investigates additive effects on LTO. Large‐scale Li‐ion capacitors (LIC) of LTO//activated carbon (AC) are crafted and evaluated. Notably, adding just 1% of methylene methanedisulfonate (MMDS) or fluoroethylene carbonate (FEC) to a 1 m LiPF6 electrolyte markedly increases capacities and maintains performance over 500 cycles, outperforming other additives. These additives also boost large‐scale capacitor capacities, showing exceptional stability for over 1600 cycles. This underlines the potential of customized electrolyte additives in elevating LTO‐based energy storage, leading to more durable and efficient lithium‐based solutions.