公开(公告)号：US20190036159A1

公开(公告)日：2019-01-31

申请号：US16047247

申请日：2018-07-27

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Ho Sung KIM ,  Seung Hoon YANG ,  Min-young KIM ,  Ha Young JUNG ,  Da Hye KIM

IPC: H01M10/0562 ,  H01M10/052 ,  H01M10/0585 ,  H01M4/505 ,  H01M4/525 ,  H01M4/62

CPC classification number: H01M10/0562 ,  C04B35/486 ,  C04B35/63488 ,  C04B2235/3203 ,  C04B2235/3217 ,  C04B2235/3227 ,  C04B2235/3286 ,  C04B2235/6025 ,  C04B2235/6567 ,  H01M4/131 ,  H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M4/625 ,  H01M10/052 ,  H01M10/0585 ,  H01M2300/0077

Abstract: Disclosed is a gallium (Ga)-doped LLZO solid electrolyte represented by Chemical Formula 1 below, a method of preparing the same, and an all-solid-state lithium secondary battery including the same. In the solid electrolyte according to the present invention and the preparation method thereof, the amounts of gallium and lithium of starting materials are adjusted and the flow rate of materials to be supplied is controlled, thus forming a high-precision cubic structure and improving sintering properties, thereby increasing the ionic conductivity of the solid electrolyte. The lithium secondary battery including the solid electrolyte can exhibit superior charge/discharge characteristics and cycle characteristics. LixGayLazZrwO12(5≤x≤9, 0