Enhanced Safety, High-Rate and High-Voltage Performance of a Lithium-Ion Battery Using Nonflammable Liquid Electrolyte

These days lithium-ion battery (LIB) market is rapidly expanding by electric mobilities and stationary energy storage system industries. One of the biggest challenges in the research and development of advanced LIB is to achieve simultaneously outstanding energy density, cycle life, charge rate, and safety. For fast charging, battery chemistry and reaction kinetics are being evolved from the current hours scale toward minutes scale charging. In the LIB electrolyte perspective, the conventional carbonate-based liquid electrolyte has several limitations in safety and high-rate and high-voltage performance, due to low thermal and anodic stabilities under extreme operation conditions like high temperature, high-current, and high-voltage. To mitigate those issues, we have been developing new and safe electrolyte without any trade-off with cycling performance and energy density of Li-ion batteries. Herein, we present high-rate and high-voltage cycling performance and high safety of nickel-rich cathode-based lithium-ion full-cell fabricated with nonflammable liquid electrolyte. The correlation between the stability of nonflammable liquid electrolyte and its derived solid electrolyte interphase (SEI) and performance will be discussed in this meeting. Acknowledgements This research was supported by the National Research Foundation grant funded by the Ministry of Science and ICT (No. 2019R1A2C1084024).