Phosphorus Containing Compound, and Electrolyte for Rechargeable Lithium Battery and Rechargeable Lithium Battery Including the Same

The invention relates to a phosphorus containing compound represented by the Chemical Formula 1, the use of the same as an electrolyte additive, and an electrolyte for a rechargeable lithium battery and rechargeable lithium battery including the same as well as a method of preparing compounds of Chemical Formula 1. (R 1 O) 2 P(NR 2 R 3 )Formula 1 In Chemical Formula 1, each substituent is the same as described in the detailed description.