公开(公告)号：US10886560B2

公开(公告)日：2021-01-05

申请号：US16072571

申请日：2016-11-15

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Ho Sung Kim ,  Min-Young Kim ,  Seung Hoon Yang ,  Da-Hye Kim ,  Kyeong Joon Kim ,  Seung Woo Choi ,  Jinsub Lim ,  Duck Rye Chang

IPC: H01M10/0562 ,  H01M10/052 ,  H01M4/62 ,  H01M10/058 ,  H01M4/505 ,  H01M4/525

Abstract: The present invention relates to an all-solid-state lithium secondary battery and a method of manufacturing the same. The all-solid-state lithium secondary battery includes a cathode, an anode, and a composite solid electrolyte layer between the cathode and the anode, wherein first and second LLZOs contained respectively in the cathode and the composite solid electrolyte layer are each independently aluminum-doped or undoped LLZO, and the battery of the invention can exhibit improved discharge capacity and cycle characteristics because both the cathode and the composite solid electrolyte layer contain a conductive polymer, a lithium salt and an inorganic ceramic solid electrolyte. The method of the invention enables the all-solid-state lithium secondary battery to be manufactured in a non-sintering manner, thus reducing manufacturing costs and controlling interfacial reactions between active materials, between solid electrolyte particles, and between an electrolyte and an electrode, thereby further reducing the internal resistance of the battery.

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

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