US 12,068,451 B2
Lithium-ion secondary battery and manufacturing method thereof
Naohiro Hayashi, Kariya (JP); Keita Takahashi, Kariya (JP); Ryohei Yamamoto, Nisshin (JP); Ikuna Satou, Nisshin (JP); Shingo Ohta, Nagakute (JP); and Masaki Watanabe, Toyota (JP)
Assigned to DENSO CORPORATION, Kariya (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by DENSO CORPORATION, Kariya (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jul. 14, 2020, as Appl. No. 16/928,914.
Claims priority of application No. 2019-131337 (JP), filed on Jul. 16, 2019.
Prior Publication US 2021/0020982 A1, Jan. 21, 2021
Int. Cl. H01M 10/0525 (2010.01); H01M 10/0562 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0562 (2013.01) [H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2300/0068 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A lithium-ion secondary battery comprising:
a single cell that includes a first electrode, a separator stacked on the first electrode, and a second electrode stacked on the separator,
wherein:
the first electrode includes
a porous body that
includes at least one LLZ-based solid electrolyte comprising a lithium lanthanum zirconate or a lithium lanthanum zirconate doped with an atom other than a Li atom, a La atom, and a Zr atom, and
has a pore, and
an active material held in the pore; and
the separator
has a relative density of 80% or more, and
includes (i) the at least one LLZ-based solid electrolyte comprising the lithium lanthanum zirconate or the lithium lanthanum zirconate doped with the atom other than the Li atom, the La atom, and the Zr atom, and (ii) at least one of a B atom, a P atom, or a Si atom, and
wherein:
the porous body includes the at least one of the B atom, the P atom, or the Si atom;
a total amount of the B atom, the P atom, and the Si atom in the porous body is less than a total amount of the B atom, the P atom, and the Si atom in the separator; and
a melting point of a sintering aid in the porous body is higher than a melting point of a sintering aid in the separator.