SOLID ELECTROLYTE FOR ALL SOLID-STATE LITHIUM-ION BATTERY AND MANUFACTURING METHOD THEREFOR

摘要

Disclosed is a method for manufacturing a solid electrolyte for a lithium-ion battery, which is capable of synthesizing LLZ material that is a garnet-structure nano ceramic solid electrolyte having high ionic conductivity and excellent potential stability due to co-precipitation. The method for manufacturing a solid electrolyte for a lithium-ion battery comprises the steps of: providing a starting material in which lanthanum nitrate [La(NO3)3·6H2O] and zirconium nitrate [ZrO(NO3)2·6H2O] are mixed at a mole ratio of 3:2; forming an aqueous solution by dissolving the starting material; forming a precipitate by putting ammonia, which is a complex agent, and sodium hydroxide, which adjusts the pH of a reactor, into the aqueous solution, mixing the same, and then co-precipitating the mixture; forming a primary precursor powder by cleaning, drying and pulverizing the precipitate; forming a secondary precursor powder by mixing lithium powder [LiOH·H2O] with the primary precursor powder and ball-milling the mixture so as to solidify the lithium; and forming a solid electrolyte powder by heat-treating the secondary precursor powder.