Collector and electrode structure, non-aqueous electrolyte cell, electrical double layer capacitor, lithium ion capacitor, or electrical storage device using same
Provided is a technique to confirm the performance of the conductive resin layer of a current collector without actually preparing an electrode structure, a non-aqueous electrolyte battery, an electrical double layer capacitor, a lithium ion capacitor, or an electrical storage device, and to confirm the performance of the conductive resin layer easily with high accuracy by a non-destructive test. A current collector includes a conductive substrate and a resin layer possessing conductivity, the resin layer being formed on at least one side of the conductive substrate. The resin layer possessing conductivity contains a resin and a conductive material containing carbon as a main component. When the color tone of the surface of the resin layer possessing conductivity is specified with L*a*b* color system, L* is 60 or lower, a* is −1.0 to 1.0, and b* is −1.0 to 3.0.
1. A current collector comprising:
a conductive substrate, and
a resin layer possessing conductivity provided on at least one side of the conductive substrate; wherein
the resin layer possessing conductivity includes a conductive particle and a resin;
an amount of the conductive particle is 60 to 80 parts by mass with respect to 100 parts by mass of the resin;
the resin contains a soluble nitrocellulose-based resin; and
a color tone of a surface of the resin layer possessing conductivity specified with L*a*b* color system, satisfies the following conditions of:
L*≦ 60
1.0≦ a*≦ 1.0
−1.0≦ b*≦ 3.0.
2. The current collector of claim 1 , wherein the color tone satisfies the following conditions, with respect to a thickness t (μm) of the resin layer possessing conductivity:
−5 t+ 25≦ L*≦− 5 t+ 70
−0.01 t− 0.3≦ a*≦− 0.01 t+ 0.7
0.01 t≦b*≦ 0.01 t+ 1.
3. The current collector of claim 1 , wherein the conductive particle contains carbon.
4. The current collector of claim 1 , wherein the surface of the resin layer possessing conductivity is exposed.
5. An electrode structure comprising:
the current collector of claim 1 , and
an active material layer or an electrode material layer formed on the resin layer possessing conductivity.
6. A non-aqueous electrolyte battery, an electrical double layer capacitor, a lithium ion capacitor, or an electrical storage device, comprising the electrode structure of claim 5 .