Current collector for lithium ion battery and manufacturing method of the current collector

A manufacturing method of a current collector for a lithium ion battery, comprising:

• a step of forming a first conductive resin layer containing a first conductive filler;
• and
• a step of forming a second conductive resin layer containing a second conductive filler, on the first conductive resin layer,
• wherein the first conductive filler is a conductive carbon,
• the second conductive filler includes at least one kind of metal element selected from the group consisting of platinum, gold, silver, copper, nickel, and titanium,
• a surface of the first conductive resin layer on a side opposite to the second conductive resin layer is a first surface,
• a surface of the second conductive resin layer on a side opposite to the first conductive resin layer is a second surface,
• a volume % of the second conductive filler in the second conductive resin layer on the first conductive resin layer side is higher than that on the second surface side,
• the manufacturing method further comprises a step of controlling a specific heat capacity Cp in a 40° C. environment of the current collector for a lithium ion battery and a surface resistance value of the second surface to target values by adjusting the volume % of the second conductive filler in the second conductive resin layer,
• the target value of the specific heat capacity is at least 0.9 mJ/mg·° C. and at most 2.2 mJ/mg·° C., and
• the target value of the surface resistance value of the second surface is at least 1Ω/□ and at most 2Ω/□.