The impact of novel modified lithium methacrylate trifluoroborate (LiBF3-MA) additive for anode interfaces under high temperature operating condition

Abstract

The formation of a dense and stable solid electrolyte interphase (SEI) film on graphite anodes is critical for enhancing the performance and lifespan of lithium-ion batteries, particularly under high-temperature conditions. This study explores the development of a novel film-forming lithium salt additive, Lithium methacrylate trifluoroborate (LiBF₃-MA), which demonstrates an early reduction current at approximately 2.5 V and achieves a slightly lower initial Coulombic efficiency (ICE) of 90.32 % in LFP/AG cells. Furthermore, under high-temperature conditions, LiBF₃-MA synergizes with vinylene carbonate (VC) to construct a mechanically robust SEI layer, extending the battery's operational lifespan by 68 % compared to cells using VC alone. The compatibility of LiBF₃-MA with other additives opens new avenues for designing multifunctional electrolytes, while its straightforward synthesis process highlights its potential for large-scale commercialization. This work underscores the importance of advanced SEI film engineering in achieving high-performance lithium-ion batteries, particularly for demanding applications.