Development of cathode-electrolyte-interphase for safer lithium batteries

Accompanied by the adoption of aggressive cathodes to continuously improve batteries energy density, enhancing their safety is becoming increasingly urgent for the electric vehicle development. In-situ controllable formation of robust cathode-electrolyte interphase (CEI) with high inorganic content seems to be the most promising strategy to address the thermal runaway concerns. Moreover, the in-situ formation strategy via suitable electrolyte replacement or electrolyte additives is extremely simple yet effective, especially for industrial manufacture of batteries. Here, this paper briefly reviews recent advanced CEIs formed by conventional carbonate-based electrolytes, fluorinated electrolytes, concentrated electrolytes, and solid state electrolytes. The focus on the thermal stability of the cathodes after CEI modification, and at the same time conduct safety tests at the material, cell, and module levels for comprehensive evaluation are encouraged. The review will provide inspiration for future developments in battery safety and push forward the practical applications of newly developed high-energy density batteries.

Automated summary

As electric vehicle development progresses with the adoption of aggressive cathodes to improve batteries' energy density, the need to enhance safety becomes increasingly urgent. In-situ controllable formation of robust cathode-electrolyte interphase (CEI) with high inorganic content appears to be a promising strategy to address thermal runaway concerns. Emphasizing the thermal stability of cathodes after CEI modification and conducting safety tests at various levels is encouraged for comprehensive evaluation and future advancements in battery safety.