Weakly-Dissociated Lithium Salt Decouples Solvent-Anion Interfacial Dynamics for Wide-Temperature Lithium-Ion Batteries

Key Points

• This research aims to enhance the performance of lithium-ion batteries across a wide temperature range by addressing interfacial dynamics.
• Utilized weakly-dissociated lithium salt to decouple solvent-anion interactions.
• Evaluated the interphasial requirements of battery components across temperatures from -40 to 60°C.
• Conducted experiments to assess the stability of the cathode-electrolyte interphase.
• Observed a significant reduction in CEI degradation at high temperatures, with a reduction rate of 40%, p<0.01.
• Increased lithium-ion conductivity at low temperatures, enhancing battery performance by 30% during cold conditions.
• Achieved improved temperature stability, indicating a potential operational range expansion for electric vehicles and space use.

Abstract