Copper wire with Graphene could be the solution for EVs

Researchers at the Pacific Northwest National Laboratory in the US have increased the conductivity of copper wire used in automotive components by 5%. According to the scientists - who partnered with General Motors to test the souped-up copper wire - their invention can make a big difference in engine efficiency by potentially using less copper, which can reduce the weight and volume of various components that are likely to be future Will power electric vehicles.

Using a new, patented and patent-pending manufacturing platform, the experts added graphene to the copper and produced wire. The increase in conductivity compared to pure copper is made possible by a novel machine that combines and extrudes metal and composite materials, including copper. The process was called ShAPE, which stands for Shear Assisted Processing and Extrusion. In this process, a counterforce - or shear force - is applied by the rotation of a metal or composite material as it is pushed through a nozzle to create a new shape.

This approach creates internal heating by deforming the metal, which makes it softer and allows it to form into wires, tubes, and rods. "ShAPE is the first to achieve improved conductivity of copper on a mass scale, meaning it can produce materials in the size and format that the industry is currently using," said Glenn Grant, the initiative's lead researcher, in a Media statement. "The benefits of adding graphene to copper have been explored before, but these efforts have focused primarily on thin films or layers that are extremely costly and time-consuming to manufacture.

The ShAPE process is the first demonstration of a significant improvement in the conductivity of Copper-graphene composites made in a truly scalable process. Adding graphene to copper has proven difficult, according to Grant, because the additives do not mix evenly and form clumps and pore spaces within the structure. However, the shaping process eliminates pore spaces and at the same time distributes the additives evenly within the metal, which can be the reason for the improved electrical conductivity. "ShAPE's even distribution of graphene is the reason that only really tiny amounts of additives are needed - about six parts per million graphene flakes - to achieve a substantial 5% improvement in conductivity," said materials scientist Keerti Kappagantula in the briefing.

"Other methods require large quantities of graphene, which is very expensive to produce, and still haven't achieved the high conductivity that we have demonstrated on a mass scale." Kappagantula said General Motors' research and development engineers verified that higher conductivity copper wire can be welded, soldered, and formed in exactly the same way as traditional copper wire. This indicates seamless integration into existing engine manufacturing processes. According to the researcher, the technology can also be applied to other industries that use copper to carry electrical energy, including power transmission, electronics, wireless chargers, generators, underwater cables and batteries.