Method of preparing electrode for lithium secondary battery and electrode for lithium secondary battery prepared by using the same

A method of preparing a positive electrode for a lithium secondary battery, comprising:

• forming an inorganic electrolyte layer directly on a positive electrode current collector by immersing the positive electrode current collector in a composition for forming the inorganic electrolyte layer and applying a current;
• and
• forming an organic electrolyte layer by immersing the positive electrode current collector having the inorganic electrolyte layer formed thereon in a composition for forming the organic electrolyte layer and applying a current,
• wherein
• the composition for forming the inorganic electrolyte layer comprises a compound represented by Formula 1:
• MM′Xn-m(SO2) [Formula 1]
• M is a metallic element selected from the group consisting of lithium (Li), sodium (Na), potassium (K), and rubidium (Rb),
• M′ is a metallic element selected from the group consisting of aluminum (Al), gallium (Ga), indium (In), and titanium (Ti),
• X is a halogen element selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I),
• n is an integer of 1 to 6, and
• m is an integer of 1 to 10,
• the composition for forming the organic electrolyte layer comprises an organic solvent and a lithium salt, and
• the lithium salt includes Li+ as a cation and at least one selected from the group consisting of F−, Cl−, Br−, I−, NO3−, BF4−, ClO4−, AlO4−, AlCl4−, PF6−, SbF6−, AsF6−, BF2C2O4−, BC4O8−, (CF3)2PF4−, (CF3)3PF3−, (CF3)4PF2−, (CF3)5PF−, (CF3)6P−, CF3SO3−, C4F9SO3−, CF3CF2SO3−, CF3CF2(CF3)2CO, (CF3SO2)2CH, CF3(CF2)7SO3−, CF3CO2−, CH3CO2−, SCN−, and mixture thereof.