公开(公告)号：US10818968B2

公开(公告)日：2020-10-27

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 ,  H01M4/525 ,  H01M4/62 ,  H01M4/505 ,  H01M10/0585 ,  C04B35/486 ,  C04B35/634 ,  H01M4/131

Abstract: A method of preparing a gallium-doped LLZO solid electrolyte includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution comprising a metal aqueous solution including lanthanum (La), zirconium (Zr) and gallium (Ga), a complexing agent and a pH controller to coprecipitation; (b) preparing a solid electrolyte precursor by washing and drying the solid electrolyte precursor slurry; (c) preparing a mixture by mixing the solid electrolyte precursor with a lithium source; (d) preparing a gallium-doped LLZO solid electrolyte represented by Chemical Formula 1 below by calcining the mixture at 600 to 1,000° C.; and (e) thereafter sintering the solid electrolyte represented by Chemical Formula 1 at 1,000 to 1,300° C. By adjusting amounts of starting materials and controlling flow rates of supplied materials, a high-precision cubic structure with improved sintering properties is obtained and ionic conductivity of the solid electrolyte is increased. LixGayLazZrwO12, (5≤x≤9, 0