Exotic materials and the like are just silly for this. I mean, yeah, the purer the copper the better but the effect of pure vs "non pure" is so small it doesn't even register, most likely. For "bulk transmission" of electricity, as long as it's conductive and copper-ish it's good. Even in the audiophile world where talking speaker cables there's a lot of arrant nonsense about cables and materials etc... most of it total bull****, so I'm kind of allergic to the entire topic. The one thing that matters for a cable like this is that it is thick enough to transmit enough power. If it gets too thin it does start restricting the flow, so that's why speaker cables that are hair thin will make inferior sound. But once you get enough of a cross section, the cheapest copper wire you can buy is just as good as the most expensive one.
There are lots of misconceptions about electricity in general, and I'm sure I'm a victim of some of those myself. People often think powering the starter motor is like pushing something from the battery to the motor and that the motor can burn out if there is too thick a cable etc... but it doesn't work that way, the battery is a pool from which the motor draws what it can handle when it comes to amps, is a more accurate-ish way to look at it.