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Researchers from the Korean Institute of Science and Technology (KIST) created a totally metal-free electric motor using only carbon nanotubes in its coils.
Researchers from the Korea Institute of Science and Technology (KIST) created a functional electric motor with coils made of carbon nanotubes (CNT), without a gram of metal. The LAST technique promises to increase conductivity and drastically reduce weight, with direct impacts on electric cars, drones, and space.
The novelty is not just replacing copper wire with another material. The KIST team aligned and purified carbon nanotubes to create core-sheath composite electric cables (CSCEC), enabling a metal-free electric motor. According to the institute, the trick is to organize the CNT in a highly ordered manner, which elevates the electrical performance of the assembly.
The key step is the Lyotropic Liquid Crystal-Assisted Surface Texturing (LAST) process, which puts the nanotubes in a liquid crystal state, aligns the structures, and removes remaining metallic impurities from the synthesis. In tests, LAST increased the electrical conductivity of the CNT cables by around 130% compared to traditional methods, maintaining flexibility and very low weight.
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The motor with CNT coils operated stably on the test bench, showing a significant reduction in the mass of the coils compared to copper. Lighter vehicles and propulsion systems tend to gain autonomy and efficiency, especially in electric cars and aerial platforms.
How Carbon Nanotubes Can Replace Copper in Electric Motors
CNT are cylindrical carbon structures with a very high strength-to-weight ratio and conductivity comparable to copper, when aligned and densified correctly. Long-standing research at universities like Rice indicates that CNT fibers surpass benchmark materials in strength and approach the conductivity of metals, which paves the way for real electrical applications.
In the case of KIST, the CSCEC cable has a conductive core of CNT surrounded by a polymeric insulating layer, forming a thin, flexible, and lightweight wire. This architecture allows for the construction of coils for motors without using copper or aluminum. The direct gain is the mass reduction, a critical factor in powertrains where every gram impacts energy consumption and electric vehicle autonomy.
Besides weight, the thermal stability and corrosion resistance of carbon favor durability. The removal of metallic catalysts during LAST also helps preserve performance over time, avoiding conductive losses associated with impurities. In summary, it is a proposal for lightweight, robust, and stable high-tension wires.
Impact on Electric Mobility: Weight, Autonomy, and Carbon Footprint
In electric vehicles, lower mass means more range per charge or smaller batteries for the same autonomy. Initial reports indicate weight reductions of the coils exceeding 70–80% compared to copper equivalents, which, in optimized designs, translates to systemic gains in the powertrain.
The discussion also involves sustainability. Even before CNT, suppliers have been seeking to reduce the carbon footprint of automotive cables with recycled copper. Aptiv estimates savings of up to 2,022 kg of CO₂e per kilometer in large gauge cables when using recycled copper instead of primary copper, highlighting the impact that materials and processes have on emissions in the supply chain.
If CNT cables come to replace part of the copper in motors and harnesses, the industry can add two fronts: less mass to move and lower dependency on metals. For readers, the point is simple and powerful: more efficient electric cars and materials that are potentially easier to recycle in the future, as recent studies show recycling of CNT fibers without loss of properties.
What Is Still Missing: Costs, Industrial Scale, and Field Validation
The transition from the laboratory to the assembly line requires scale, repeatability, and competitive costs. Producing cables with consistent CNT alignment, low impurities, and high density is still a challenge. The good news is that the ecosystem is already moving, with companies like LG Chem expanding CNT capacity for batteries, indicating maturation of the supply chain and growing mastery over mass production.
Even with the advancement of LAST, CNT motors need to accumulate validation hours under thermal cycles, vibration, and humidity, to prove equivalent reliability to metallic coils. The current electrical performance is already sufficient for functional prototypes, but automakers often require extensive screenings before approving a new material in the powertrain.
Another point is the cost per meter of the cable. As the processes for alignment and winding of CNT evolve and demand increases, the trend is for prices to fall. Technical and market literature projects robust expansion of CNT usage in energy, aerospace, and automotive sectors, which could accelerate economies of scale and standardization.
Testing with Electric Cars, Drones, and Aerospace Applications
In the short term, experts see adoption starting with smaller motors and applications where weight matters, such as drones and space systems, later migrating to automotive traction motors as the technology matures. The KIST prototype shows that metal-free motors are feasible, and this tends to inspire tests of subassemblies in development vehicles.
Hybrid architectures are likely to emerge, combining CNT coils and metal conductors in specific zones of the motor or harness, as costs fall and standards consolidate. This strategy has already occurred with other lightweight materials in the industry.
For the audience, the main message is clear: carbon nanotubes are moving from speech to functional hardware, with methods validated in peer-reviewed publications and official announcements from KIST. The road to street cars requires engineering, but the technological leap has already happened, and the sector is closely monitoring.
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