公开(公告)号：US20190051934A1

公开(公告)日：2019-02-14

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 ,  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：US20180248223A1

公开(公告)日：2018-08-30

申请号：US15754630

申请日：2016-08-23

Applicant: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

Inventor： Ho Sung KIM ,  Min-Young KIM ,  Seung Hoon YANG ,  Jinsub LIM ,  Duck Rye CHANG ,  Jong Ho LEE

IPC: H01M10/0562 ,  H01M10/0585 ,  H01M10/0525

CPC classification number: H01M10/0562 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/0585 ,  H01M2300/0071

Abstract: Disclosed is a method of preparing a solid electrolyte, which includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution including a metal precursor solution, containing a lanthanum precursor, a zirconium precursor and an aluminum precursor, 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, and (d) preparing an aluminum-doped lithium lanthanum zirconium oxide (LLZO) solid electrolyte by calcining the mixture, and which is also capable of adjusting the aluminum content of a starting material to thus control sintering properties and of adjusting the composition of a precursor and a lithium source to thus control the crystal structure, thereby improving the ionic conductivity of the solid electrolyte. In addition, a method of manufacturing an all-solid-state lithium secondary battery, including a solid electrolyte having improved ion conductivity, can be provided using the method of preparing the solid electrolyte.