ELECTROLYTE AND SECONDARY BATTERY INCLUDING THE SAME

The present invention relates to an electrolyte and a secondary battery including the same. More particularly, the present invention relates to an electrolyte including a compound represented by Chemical Formula 1 below and an acid, a method of preparing the electrolyte, and a secondary battery including the electrolyte. [Chemical Formula 1] PxOy In Chemical Formula 1, P is phosphorus, O is oxygen, x is a multiple of 2, and y is 5x/2. According to the present invention, the present invention has an effect of providing a secondary battery that is capable of being charged rapidly due to reduced charge resistance, has excellent output due to reduced discharge resistance, is capable of being stored for a long time, has a long lifespan, and has excellent high-temperature capacity retention rate.