| abstract |
Disclosed herein is electrolyte for lithium secondary batteries comprising an additive capable of forming a passivation layer on the surface of an anode by oxidative degradation before the electrolyte is oxidatively degraded on the anode surface, thereby inhibiting degradation of the electrolyte. Since the nonaqueous electrolyte can inhibit an increase in the thickness of a battery even when the battery is stored at high temperature in a fully charged state without adversely affecting the characteristics of the battery, improved reliability can be ensured upon battery set mounting. In addition, the nonaqueous electrolyte can prevent thermal runaway upon being overcharged, and can improve flame retardance, ensuring good safety of lithium secondary batteries. |