FLAME-RESISTANT ELECTROLYTE FOR RECHARGEABLE LITHIUM SECONDARY BATTERIES AND RECHARGEABLE LITHIUM SECONDARY BATTERY INCLUDING THE SAME

摘要

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