The present disclosure provides a phosphazene derivative, a composition for an electrochemical device and an electrochemical device containing the composition The composition includes an electrolyte, a non-aqueous solvent and an additive. The additive incl...

The present invention provides a nonaqueous electrolyte solution, which can improve flame retardancy and ameliorate performances of a battery without deteriorating the basic battery performance as far as possible, and a secondary battery. The nonaqueous el...

An electrolyte additive represented by chemical formula 1, for use in a rechargeable lithium battery, and an electrolyte solution including same; wherein X 1 to X 5 are each independently a halogen atom or a halogen-containing group; and Z is represented b...