US 12,738,503 B2Granted

Binder for all-solid-state secondary battery, binder composition for all-solid-state secondary battery, slurry for all-solid-state secondary battery, solid electrolyte sheet for all-solid-state secondary battery, method for producing same, all-solid-state secondary battery, and method for producing same

AssigneeENEOS Materials Corporation

InventorsShingo Itai, Keigo Aso, Masashi Iida, Tatsuya Abe

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Abstract

A binder for an all-solid-state secondary battery, which can suppress binder migration in a production process for an electrode of an all-solid-state secondary battery, leading to satisfactory binding properties and flexibility of the resultant electrode, and to excellent lithium ion conductivity, and by extension, can achieve a satisfactory cycle life characteristic. The binder for an all-solid-state secondary battery includes a conjugated diene-based polymer (A) that has a conjugated diene unit based on a conjugated diene compound, and has a solubility parameter (SP value) of 16.80 MPa1/2 or more and 17.80 Mpa1/2 or less.

Claims20

Dependent claims

A binder, comprising:

a conjugated diene-based polymer (A) having a bound styrene content in a range of from 5 to 40%,
wherein the conjugated diene-based polymer (A) has a conjugated diene unit based on a conjugated diene compound,
wherein the conjugated diene-based polymer (A) has a solubility parameter (SP value) of 16.80 MPa1/2 or more and 17.80 MPa1/2 or less,
wherein the conjugated diene-based polymer (A) has a value a calculated by equation (1), of less than 0.7:
α=(p+(0.5×r))/(p+q+(0.5×r)+s) (i),
wherein
p is a constituent molar ratio of a structural unit of formula (1):
q is a constituent molar ratio of a structural unit of formula (2):
r is a constituent molar ratio of a structural unit of formula (3):
and
s is a constituent molar ratio of a structural unit of formula (4):

8 more elements

Dependencies are inferred from the claim text.