- Glass ceramics for low temperature co-sintering of electrode and electrolyte and solid state battery using the same

摘要

The present invention proposes a glass electrolyte capable of simultaneous firing at a low temperature after integrally stacking an electrode and an electrolyte as an electrolyte for a lithium secondary all-solid-state battery. Specifically, Li 1.2 + x Fe 0.2 + x Ti 1.8-x (PO 4) 3-y (BO 3) y , or Li 2 Sn 0 .5 (BO 3 ) 1- x (PO 4) in an intermediate oxide Ti x instead of Fe, mesh oxide PO 4 instead of replacing the BO 3 or ionic conductor is Li 1 .5-x M x a 0.5 (a = Sn, Ti) (PO 4) in an intermediate or formula 1..5 BO 3 oxide and After adding the mesh oxide, sucrose is mixed with the composition and melted in a reducing atmosphere, as a glass electrolyte having a high ionic conductivity of ×10 -4 ~ ×10 -5 S/cm at a temperature 200 ~ 300℃ lower than before. A novel glass electrolyte with excellent lithium ion conductivity is provided. A composite electrolyte and a composite electrode are manufactured by mixing this glass electrolyte with an electrolyte and an electrode in the range of 13 to 33 wt%, and a cell in which the composite electrolyte and composite electrode are laminated and integrated is simultaneously fired at a low temperature of 750 to 825° C. battery can be manufactured. According to the present invention, it is possible to laminate and integrate an all-solid-state battery at a low temperature without an interfacial reaction between the electrode and the electrolyte, and a new sintering aid and glass electrolyte can be manufactured simply and inexpensively, and the performance of the all-solid-state battery can be improved. .