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US 2024/0392071 A1Published application
Soluble polyimide binder for cathode of lithium secondary battery, manufacturing method thereof, and lithium secondary battery comprising same
AssigneeIpitech Inc
InventorsHo Young PARK, Kye Ung LEE, Jun Yun LEE
Life of this patent
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Abstract
Disclosed are a soluble polyimide binder for a cathode of a lithium secondary battery capable of securing high heat resistance, safety, and excellent battery performance by using the soluble polyimide binder as a cathode binder for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery comprising same.
Claims9
A method for preparing a soluble polyimide binder for a positive electrode of a lithium secondary battery, the method comprising:
- (a) dissolving a diamine-based monomer and a dianhydride monomer in an organic solvent to prepare a mixed solution;
- (b) polymerizing the mixed solution to produce polyamic acid and then adding a catalyst thereto;
- and
- (c) heating the polyamic acid having the catalyst added thereto to a high temperature of 160 to 180° C. to imidize the polyamic acid to produce the soluble polyimide binder,
- wherein in the (c), the soluble polyimide binder includes a copolymer containing a repeating unit represented by a following Chemical Formula 1, a repeating unit represented by a following Chemical Formula 2, and a repeating unit represented by a following Chemical Formula 3, and the soluble polyimide binder has a glass transition temperature of 100 to 300° C.:
- where in the Chemical Formula 1, the Chemical Formula 2, and the Chemical Formula 3, each of R1, R4 to R6, and R9 independently represents at least one functional group selected from a group consisting of a sulfonic acid group, an ether group, and a carboxyl group,
- each of R2, R3, R7, R8, R10, and R11 independently represents one functional group selected from CH3-xFx,
- wherein x is an integer from 1 to 3, and each of a, b, and c is independently an integer from 2 to 200.
5 more elements
A soluble polyimide binder for a positive electrode of a lithium secondary battery, wherein the soluble polyimide binder comprises:
- a copolymer containing a repeating unit represented by a following Chemical Formula 1, a repeating unit represented by a following Chemical Formula 2, and a repeating unit represented by a following Chemical Formula 3;
- a catalyst;
- and
- an organic solvent,
- wherein the soluble polyimide binder has a glass transition temperature of 100 to 300° C.:
- where in the Chemical Formula 1, the Chemical Formula 2, and the Chemical Formula 3, each of R1, R4 to R6, and R9 independently represents at least one functional group selected from a group consisting of a sulfonic acid group, an ether group, and a carboxyl group,
- each of R2, R3, R7, R8, R10, and R11 independently represents one functional group selected from CH3-xFx,
- wherein x is an integer from 1 to 3, and each of a, b, and c is independently an integer from 2 to 200.
5 more elements
A lithium secondary battery comprising:
- a positive electrode including an active material, a binder, and a conductive material;
- a negative electrode spaced apart from the positive electrode and including a negative electrode active material, a binder, and a conductive material;
- a separator disposed between the negative electrode and the positive electrode to prevent short circuit between the negative electrode and the positive electrode;
- and
- an electrolyte solution impregnated into the negative electrode and the positive electrode,
- wherein the binder of the positive electrode is a soluble polyimide binder, wherein the soluble polyimide binder includes:
- a copolymer containing a repeating unit represented by a following Chemical Formula 1, a repeating unit represented by a following Chemical Formula 2, and a repeating unit represented by a following Chemical Formula 3;
- a catalyst;
- and
- an organic solvent,
- wherein the soluble polyimide binder has a glass transition temperature of 100 to 300° C.:
- where in the Chemical Formula 1, the Chemical Formula 2, and the Chemical Formula 3, each of R1, R4 to R6, and R9 independently represents at least one functional group selected from a group consisting of a sulfonic acid group, an ether group, and a carboxyl group,
- each of R2, R3, R7, R8, R10, and R11 independently represents one functional group selected from CH3-xFx,
- wherein x is an integer from 1 to 3, and each of a, b, and c is independently an integer from 2 to 200.
11 more elements
Dependencies are inferred from the claim text.