Electrolyte for lithium ion rechargeable battery and lithium ion rechargeable battery including the same

摘要

An electrolyte for the lithium rechargeable battery includes (i) an non-aqueous organic solvent; (ii) a lithium salt; (iii) a halogenated ethylene carbonate in the ranges of 0.1 to 10 weight % based on the total amount of the electrolyte; and (iv) vinylethylene carbonate in the ranges of 0.1 to 3 weight % based on the total amount of the electrolyte. With this electrolyte, the battery life and the storing property at a high temperature can be improved because the increasing rate of the battery thickness according to the increased internal pressure in the battery due to the gas generation is reduced when being kept at the high temperature. Further, the discharging property at a low temperature is increased.