Flame-resistant electrolyte for rechargeable lithium secondary batteries and rechargeable lithium secondary battery including them

摘要

The present disclosure provides a flame resistant electrolyte for lithium secondary rechargeable batteries and a rechargeable lithium secondary battery including the same. The flame-resistant electrolyte for lithium secondary rechargeable batteries can reduce the volatility of an organic solvent and inhibit flammability to improve the stability of a battery when a flame-resistant solvent containing a phosphazene-based fluorinated phosphorous compound and a phosphite-based compound for forming protective films on surfaces of negative and positive electrodes, mixed with a lithium salt and a carbonate-based solvent, and thus has good life characteristics and high battery charge / discharge efficiency even under high temperature and high voltage environments, and also has improved battery performance the electrode interface is stabilized to inhibit side reactions with the electrolyte.