US 12,261,300 B2
Positive electrode layer for all-solid secondary battery, all-solid secondary battery including the same, and method of preparing the same
Myoungki Min, Yongin-si (KR); and Kwangjong Suh, Yongin-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR)
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
Filed on Aug. 30, 2021, as Appl. No. 17/460,680.
Claims priority of application No. 10-2020-0110587 (KR), filed on Aug. 31, 2020.
Prior Publication US 2022/0069310 A1, Mar. 3, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/40 (2006.01); H01M 10/0562 (2010.01)
CPC H01M 4/623 (2013.01) [H01M 4/0471 (2013.01); H01M 4/366 (2013.01); H01M 4/405 (2013.01); H01M 4/625 (2013.01); H01M 10/0562 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A positive electrode layer for an all-solid secondary battery, the positive electrode layer comprising a positive electrode current collector and a positive active material layer on the positive electrode current collector,
wherein:
the positive active material layer includes:
a positive active material,
a binder,
a conducting agent,
a sulfide solid electrolyte, and
a dispersion medium, the dispersion medium including a compound represented by Formula 1 and a compound represented by Formula 2,
R2 in Formula 1 and R2′ in Formula 2 have the same number of carbon atoms, and an amount of the compound represented by Formula 2 in the positive electrode layer is in a range of about 100 ppm to about 500 ppm, relative to an amount of the compound represented by Formula 1 in the positive electrode layer of 100 ppm,
wherein the positive electrode layer is a product formed by wet coating and drying a composition for forming the positive active material layer including the positive active material, the binder, the sulfide solid electrolyte, and the compound represented by Formula 1 below on the positive electrode current collector, and a content of the compound represented by Formula 1 is greater than a content of the sulfide solid electrolyte, and the content of the compound of Formula 1 is 20 parts by weight based on 100 parts by weight of a total solid weight of the composition or 25 to 65 parts by weight based on 100 parts by weight of the total solid weight of the composition,
R1—C(═O)O—R2  Formula 1
in Formula 1, R1 is a C1-C2 alkyl group and R2 is a C7-C9 alkyl group,
R2′—OH  Formula 2
in Formula 2, R2′ is a C7-C9 alkyl group.