Small‐Sized Aggregate Electrolytes Enable Fast‐Charging Lithium‐Ion Batteries Over Wide Temperature Range

ABSTRACT The advancement of electric vehicles necessitates power lithium‐ion batteries (LIBs) with fast‐charging capability across a broader temperature range. Traditional carbonate‐based electrolytes struggle to meet these demands due to their high solvation energy, elevated melting points, and poor interphase stability. In this study, we present an innovative electrolyte featuring a small‐sized aggregate solvation structure. This structure improves Li + migration kinetics and promotes inorganic‐rich interphase formation. Consequently, the graphite (Gr) anode demonstrates outstanding cycling stability, retaining 98.6% of its capacity after 1300 cycles and achieving a high‐rate performance of 254.5 mAh g −1 (over 70%) at 10 C. Moreover, this electrolyte delivers excellent rate performance for the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode, achieving 118.9 mAh g −1 (65%) at 10 C. In a commercial 1 Ah Gr||NCM811 pouch cell, the electrolyte sustains more than 80% capacity at 3 C and achieves 91.5% capacity retention after 1000 cycles. Notably, even at −20°C, the cell maintains a high capacity of 0.73 Ah at 0.5 C, and at an elevated temperature of 55°C, it delivers stable cycling for over 200 cycles. This small‐sized aggregate electrolyte enables fast charging of LIBs across a wide temperature range and offers valuable insights into the design of electrolytes for other cation‐based batteries.