COATING COMPOSITION, BASE MATERIAL WITH COATING FILM, SEPARATOR, SECONDARY BATTERY, LITHIUM-ION SECONDARY BATTERY, AND ELECTRODE MATERIAL
A coating composition can be applied with excellent high-speed coating properties and surface smoothness in a paint, an ink, and an adhesive which mainly contain polymers, or is a coating liquid for a positive electrode, a negative electrode, a separator, and the like of a lithium-ion secondary battery. The coating composition contains a filler, a binder, a thickener, and a solvent, wherein an aspect ratio of the filler is 2 or more, the binder is at least one selected from a diene rubber and a (meth)acrylate polymer, a viscosity of the coating composition is 1.0×10 6 Pa·s or less as measured at a shear rate of 0.01/s, and the following thixotropy index (TI) is 1.1×10 6 or more: [thixotropy index (TI)]=[viscosity of the coating composition as measured at a shear rate of 0.01/s]/[viscosity of the coating composition as measured at a shear rate of 10000/s].
1 . A coating composition comprising a filler, a binder, a thickener, and a solvent,
wherein
an aspect ratio of the filler is 2 or more;
the binder comprises at least one selected from a diene rubber and a (meth)acrylate polymer,
a viscosity of the coating composition is 1.0×10 6 Pa·s or less as measured at a shear rate of 0.01/s, and
the following thixotropy index (TI) is 1.1×10 6 or more:
[thixotropy index(TI)]=[viscosity of the coating composition as measured at a shear rate of 0.01/s]/[viscosity of the coating composition as measured at a shear rate of 10000/s].
2 . The coating composition according to claim 1 , wherein a ratio of the filler to the thickener is 0.1 to 500 in terms of mass ratio, filler/thickener.
3 . The coating composition according to claim 1 , wherein the thickener is poly-N-vinylcarboxylic acid amide.
4 . The coating composition according to claim 3 , wherein the thickener is poly-N-vinylacetamide.
5 . The coating composition according to claim 1 , wherein the thickener is polyvinylpyrrolidone.
6 . The coating composition according to claim 1 , comprising water as a solvent.
7 . The coating composition according to claim 1 , wherein a value of the thixotropy index (TI) is 1.1×10 8 or less.
8 . The coating composition according to claim 1 , wherein the aspect ratio of the filler is 100 or less.
9 . A base material with a coating film, comprising a coating film formed from the coating composition according to claim 1 and a base material.
10 . A separator formed from the base material with a coating film according to claim 9 .
11 . A secondary battery comprising the separator according to claim 10 .
12 . A lithium-ion secondary battery comprising the separator according to claim 10 .
13 . An electrode material comprising a coating film formed from the coating composition according to claim 1 on a surface of a base material.