Slurry for positive electrode of lithium-ion secondary battery, positive electrode for lithium-ion secondary battery obtained using slurry for positive electrode of lithium-ion secondary battery and production method therefor, and lithium-ion secondary battery provided with positive electrode for lithium-ion secondary battery and production method therefor

1. A slurry for a positive electrode of a lithium-ion secondary battery, comprising a positive electrode active material (A), a conductive auxiliary agent (B), a resin binder (C), a thickening dispersant (D), and water (E),

wherein the resin binder (C) is a copolymer of monomers which comprise

an aromatic vinyl compound and

at least one of an ethylenically unsaturated carboxylic acid ester and an ethylenically unsaturated carboxylic acid,

wherein the thickening dispersant (D) comprises a polyalkylene oxide having a phenyl group in the side chain, and

the polyalkylene oxide having a phenyl group in the side chain is a compound represented by the following formula (1),

wherein, n, m and l represent molar ratios of monomers, n, m and l represent integers and n+m+1=100, n+m≤98, l≥2.

2. The slurry for a positive electrode of a lithium-ion secondary battery according to claim 1 , wherein a content of the resin binder (C) with respect to 100 parts by mass of the positive electrode active material (A) is 0.2 parts by mass or more and 5.0 parts by mass or less.

3. The slurry for a positive electrode of a lithium-ion secondary battery according to claim 1 ,

wherein a content of the thickening dispersant (D) with respect to 100 parts by mass of the positive electrode active material (A) is 0.2 to 5.0 parts by mass.

4. A positive electrode for a lithium-ion secondary battery, which comprises a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector, wherein the positive electrode active material layer comprises a positive electrode active material,

wherein the positive electrode active material layer is formed from the slurry for a positive electrode of a lithium-ion secondary battery according to claim 1 .

5. A lithium-ion secondary battery comprising the positive electrode for a lithium-ion secondary battery according to claim 4 .

6. A method of producing a positive electrode for a lithium-ion secondary battery, wherein the positive electrode comprises a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector, wherein the positive electrode active material layer comprises a positive electrode active material,

wherein the method comprises a step of

applying the slurry for a positive electrode of a lithium-ion secondary battery according to claim 1 to the positive electrode current collector to form the positive electrode active material layer.

7. A method of producing a positive electrode for a lithium-ion secondary battery, comprising steps of

preparing a slurry for a positive electrode of a lithium-ion secondary battery according to claim 1 ;

preparing a positive electrode for a lithium-ion secondary battery by applying the slurry for a positive electrode of a lithium-ion secondary battery on a positive electrode current collector to form a positive electrode active material layer; and

assembling a lithium-ion secondary battery comprising the positive electrode for a lithium-ion secondary battery.