Inorganic solid electrolyte-containing composition, sheet for all-solid state secondary battery, and all-solid state secondary battery, and manufacturing methods for sheet for all-solid state secondary battery and all-solid state secondary battery
There are provided an inorganic solid electrolyte-containing composition including an inorganic solid electrolyte having an ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table, a polymer binder, and a dispersion medium, where the inorganic solid electrolyte-containing composition contains a polymer which has a constitutional component having a glass transition temperature (Tg HP ) of 50° C. or higher and an SP value of 20.0 MPa 1/2 or more in a case where the constitutional component is formed into a homopolymer and is dissolved in a dispersion medium. There are also provided a sheet for an all-solid state secondary battery and an all-solid state secondary battery, in which this inorganic solid electrolyte-containing composition is used, and manufacturing methods for a sheet for an all-solid state secondary battery, and an all-solid state secondary battery.
1 . An inorganic solid electrolyte-containing composition comprising:
an inorganic solid electrolyte having an ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table;
a polymer binder; and
a dispersion medium,
wherein the polymer binder contains a polymer having a constitutional component satisfying the following (A) and (B) and is dissolved in the dispersion medium,
(A) a glass transition temperature (Tg HP ) in a case where the constitutional component is formed into a homopolymer is 50° C. or higher, and
(B) an SP value in a case where the constitutional component is formed into a homopolymer is 20.0 MPa 1/2 or more and 25.0 MPa 1/2 or less.
2 . The inorganic solid electrolyte-containing composition according to claim 1 ,
wherein a glass transition temperature (Tg B ) of the polymer is 0 to 90° C.
3 . The inorganic solid electrolyte-containing composition according to claim 1 ,
wherein the polymer has an additional constitutional component exhibiting a glass transition temperature at which a difference (absolute value) from the glass transition temperature (Tg HP ) of the constitutional component satisfying the (A) and the (B) is 130° C. or higher.
4 . The inorganic solid electrolyte-containing composition according to claim 1 ,
wherein the constitutional component satisfying the (A) and the (B) has an aromatic ring as a partial structure.
5 . The inorganic solid electrolyte-containing composition according to claim 4 ,
wherein the aromatic ring is an aromatic hydrocarbon ring.
6 . The inorganic solid electrolyte-containing composition according to claim 1 ,
wherein the constitutional component satisfying the (A) and the (B) is represented by Formula (HC),
In Formula (HC), R H1 to R H3 represent a hydrogen atom or a substituent, L H represents a single bond or a linking group, and X H represents a monocyclic or polycyclic aromatic ring.
7 . The inorganic solid electrolyte-containing composition according to claim 1 ,
wherein the dispersion medium has an SP value of 14 to 24 MPa 1/2 .
8 . The inorganic solid electrolyte-containing composition according to claim 1 , further comprising an active material.
9 . The inorganic solid electrolyte-containing composition according to claim 1 , further comprising a conductive auxiliary agent.
10 . The inorganic solid electrolyte-containing composition according to claim 1 ,
wherein the inorganic solid electrolyte is a sulfide-based inorganic solid electrolyte.
11 . A sheet for an all-solid state secondary battery, comprising a layer formed of the inorganic solid electrolyte-containing composition according to claim 1 .
12 . An all-solid state secondary battery comprising, in the following order:
a positive electrode active material layer;
a solid electrolyte layer; and
a negative electrode active material layer,
wherein at least one of the positive electrode active material layer, the solid electrolyte layer, or the negative electrode active material layer is a layer formed of the inorganic solid electrolyte-containing composition according to claim 1 .
13 . A manufacturing method for a sheet for an all-solid state secondary battery, the manufacturing method comprising forming a film of the inorganic solid electrolyte-containing composition according to claim 1 .
14 . A manufacturing method for an all-solid state secondary battery, the manufacturing method comprising manufacturing an all-solid state secondary battery through the manufacturing method according to claim 13 .