US 12,230,805 B2
All solid state battery
Hideki Hagiwara, Nagoya (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 13, 2021, as Appl. No. 17/549,215.
Claims priority of application No. 2020-206463 (JP), filed on Dec. 14, 2020; and application No. 2021-189323 (JP), filed on Nov. 22, 2021.
Prior Publication US 2022/0190345 A1, Jun. 16, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 4/134 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 10/0585 (2010.01)
CPC H01M 4/625 (2013.01) [H01M 4/134 (2013.01); H01M 4/386 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 1 Claim
OG exemplary drawing
 
1. An all solid state battery comprising a cathode current collector, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector stacked in this order, and
the anode active material layer includes a Si based active material, and a graphite,
wherein:
a proportion of a crossing graphite among the graphite is more than 20 mass %;
an angle formed by a plane direction of (002) plane of the crossing graphite, and a stacking direction surface of the anode current collector is 45° or more and 90° or less;
a mass ratio of the graphite to the Si based active material is 0.05 or more and 0.3 or less;
the proportion of the crossing graphite is 50 mass % or more and 80 mass % or less;
when a thickness of the anode active material layer is regarded as “x” (μm), and an average particle size (D50) of the graphite is regarded as “y” (μm), y/x is 0.16 or more and 0.56 or less; and
the all solid state battery comprises a confining pressure variation in the thickness direction of from 0.21 MPa/mAh to 0.29 MPa/mAh.