公开(公告)号：US11251463B2

公开(公告)日：2022-02-15

申请号：US16348675

申请日：2017-10-27

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Ho Sung Kim ,  Min Young Kim ,  Seung Hoon Yang ,  Da Hye Kim ,  Hye Min Ryu ,  Ha Young Jung

IPC: H01M10/0562 ,  H01M10/058 ,  C01G25/02 ,  H01M10/052 ,  H01M10/0525 ,  C01G25/00 ,  H01M10/0585

Abstract: A method of preparing a sintered solid electrolyte includes (a) coprecipitating a mixed solution including a lanthanum precursor, a zirconium precursor, a gallium precursor, a complexing agent, and a pH adjuster to provide a solid electrolyte precursor; (b) washing and drying the solid electrolyte precursor to provide a washed and dried solid electrolyte precursor; (c) mixing the washed and dried solid electrolyte precursor with a lithium source to provide a mixture; (d) calcining the mixture to provide a calcined solid electrolyte, which is a gallium (Ga)-doped lithium lanthanum zirconium oxide (LLZO), as represented by Chemical Formula 1 below, LixLayZrzGawO12,  Chemical Formula 1 where 5≤x≤9, 2≤y≤4, 1≤z≤3, and 0

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