Engineering the Solid Electrolyte Interphase for Enhancing High-Rate Cycling and Temperature Adaptability of Lithium-Ion Batteries

However, tunning the solvation structure and designing kinetically-stable electrode-electrolyte interface to achieve high-rate charging and discharging remains challenges. Here, a lithium nonafluoro-1-butanesulfonate (NFSALi) additive is introduced to optimize a stability and robust solid electrolyte interface film (SEI), realizing the rapid Li+ transfer process and the structural integrity of electrode materials.

The NFSALi-derived thinner, fluorine-rich, and sulfur-containing SEI in nitrile-assistant carbonate electrolytes effectively suppresses decomposition of valeronitrile solvent during high-rate cycling and wide-temperature operation (−40~55 ℃). More importantly, the graphiteǁLiNi0.5Co0.2Mn0.3O2 pouch cell demonstrates a capacity retention of 66.88% after 200 high-rate cycles with 3 C charging and 5 C discharging at a high-temperature condition of 55 °C. This work provides significant guidance to develop inorganic-rich interfacial chemistry for lithium-ion batteries under extreme operating conditions.