US 12,334,560 B2
Fibrous-carbon-containing active material layer for all-solid lithium secondary battery and all-solid lithium secondary battery
Kazuki Yachi, Osaka (JP); Shinya Komura, Osaka (JP); and Takahiro Daido, Osaka (JP)
Assigned to TEIJIN LIMITED, Osaka (JP)
Appl. No. 17/622,600
Filed by Teijin Limited, Osaka (JP)
PCT Filed Jun. 26, 2020, PCT No. PCT/JP2020/025113
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2020/262566, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-122507 (JP), filed on Jun. 28, 2019; and application No. 2019-151605 (JP), filed on Aug. 21, 2019.
Prior Publication US 2022/0359881 A1, Nov. 10, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/625 (2013.01) [H01M 10/0525 (2013.01); H01M 2004/021 (2013.01)] 12 Claims
 
1. An active material layer for an all-solid-state lithium secondary battery comprising at least an active material, a conductive aid, and a solid electrolyte, wherein
the active material layer has a gap,
a ratio of the conductive aid in the active material layer is 0.1% by mass or more and less than 5.0% by mass,
the conductive aid contains fibrous carbon having an average fiber diameter of 10 to 900 nm, and a ratio of the fibrous carbon in the conductive aid is 20% by mass or more,
wherein a porosity of the active material layer is 5.0% by volume or more and 50% by volume or less.