The Materials That Made the Electric Car Possible
Beneath the familiar shape of a car is an entirely different way of storing, controlling and converting energy.
Park an electric car beside a petrol car and, from the pavement, the difference may appear surprisingly small. Both have four wheels, seats, headlights, brakes and a steering wheel. Both are built to take people from one place to another.
But underneath their body panels, the two vehicles represent fundamentally different ways of converting stored energy into motion.
A petrol or diesel vehicle stores energy inside a liquid fuel. That fuel is mixed with air and burned inside an internal-combustion engine. Expanding hot gases push pistons, the pistons turn a crankshaft, and a mechanical drivetrain eventually transfers that rotation to the wheels.
A battery-electric vehicle takes a very different route. Energy is stored electrochemically inside a battery. Electricity leaves that battery, passes through sophisticated power electronics and reaches an electric motor. Electromagnetic forces inside the motor then generate the torque that turns the wheels.
The EV revolution did not begin with the car. It began with the materials inside it.
That distinction matters because almost every major improvement in an electric vehicle — longer range, shorter charging time, lower weight, greater safety, higher efficiency and lower cost — ultimately depends on what scientists can make materials do.
This is where our Material Quest begins.
How does an electric vehicle actually work?
The easiest way to understand an EV is not to begin with hundreds of components. Instead, follow the energy.
Electricity enters through the charging system and is stored in the battery pack. When the driver presses the accelerator, the battery supplies electrical energy. Power electronics condition and control that energy before sending it to the traction motor. The motor turns electrical energy into mechanical rotation, and that rotation drives the wheels.
Point
Pack
Electronics
Motor
Gear
Wheels
Compared with an internal-combustion drivetrain, this energy path can be mechanically simpler. There is no combustion cycle taking place inside the traction motor, and a battery-electric vehicle does not require the same engine architecture used to burn petrol or diesel.
Look inside an EV and you find a materials laboratory on wheels
Calling an electric vehicle simply a “battery-powered car” hides much of the real engineering. An EV is a carefully integrated collection of electrochemical, magnetic, electronic, structural and thermal materials.
Battery materials
Cathode and anode materials determine how much energy a cell can store, how quickly it can charge, how long it may last, how it behaves thermally and how much it costs.
Magnetic materials
Permanent magnets and electrical steels can determine the power density and efficiency of traction motors, turning electromagnetism into useful mechanical motion.
Semiconductor materials
Power semiconductor devices switch and control large electrical currents with remarkable speed, allowing the battery and motor to communicate efficiently.
Structural & thermal materials
Aluminium alloys, advanced steels, polymers, ceramics, thermal-interface materials and other engineered systems help control mass, heat, crash protection and electrical isolation.
The component that changed the automobile
The battery pack is the energy reservoir of a battery-electric vehicle. But a battery is not simply a box filled with electricity. It is a chemical system designed to move charged particles in a controlled and reversible way.
A modern lithium-ion cell contains four central elements: a cathode, an anode, an electrolyte and a separator. The electrodes store lithium in different chemical environments, while the electrolyte enables lithium ions to move between them. The separator keeps the electrodes physically apart while still allowing ionic transport.
During charging, electrical energy supplied from outside the vehicle drives lithium ions toward the anode. During discharge, the process reverses and electrons travel through the external electrical circuit, delivering useful power.
Uses iron and phosphate in the cathode and avoids nickel and cobalt. LFP has become especially important where cost, cycle life and thermal robustness are priorities.
Nickel-containing chemistries can provide higher energy density, making them attractive where vehicle range and battery mass are especially important.
Neither chemistry is simply “better.” Battery engineering is a compromise. Higher energy density, lower material cost, thermal behaviour, charging performance, lifetime and supply-chain availability can pull designers in different directions.
According to the International Energy Agency's Global EV Outlook 2026, lithium iron phosphate accounted for more than 55% of EV batteries deployed globally in 2025.
That rapid shift is a perfect demonstration of our central idea: changing the material can change the economics and architecture of the technology built around it.
Why magnetic materials matter
An electric traction motor performs a job that sounds simple: convert electrical energy into rotation. Achieving that efficiently, quietly and in a compact package is a sophisticated materials and electromagnetic problem.
Inside a typical motor are a stationary part called the stator and a rotating part called the rotor. Carefully controlled electrical currents create magnetic fields, and the interaction of those fields produces torque.
Some traction motors use high-performance permanent magnets. These can contain rare-earth elements because certain rare-earth magnetic materials provide very strong magnetic performance in compact machines. Other motor designs can reduce or avoid permanent magnets.
This is why research into electric motors is also research into magnetic materials, electrical steels, copper conductors, insulation, thermal management and ways to reduce reliance on constrained materials.
A semiconductor controls the power that moves the car
Between the battery and the motor sits one of the least visible yet most important parts of an EV: its power electronics.
The battery supplies direct current, while many traction motors are controlled using alternating current. An inverter uses high-power semiconductor switches to convert and regulate electrical power so that the motor receives precisely what it needs at any moment.
Press the accelerator and the control system changes the electrical power delivered to the motor. Climb a hill, cruise at constant speed or slow down, and the power electronics continually adjust the flow of energy.
A small semiconductor switch can help control enough electrical power to move an entire vehicle.
Materials such as silicon remain important, while wide-bandgap semiconductor technologies such as silicon carbide are increasingly important in high-performance power electronics because material properties influence switching losses, operating voltage and thermal behaviour.
The car can recover some of the energy normally lost during braking
One of the cleverest features of an electric drivetrain appears when the driver wants to slow down.
In a conventional friction-braking event, a substantial part of the vehicle's kinetic energy ultimately becomes heat. An EV can recover some of that kinetic energy before friction brakes need to dissipate it.
During regenerative braking, the traction machine operates as a generator. Motion from the wheels drives it, electrical energy is produced, and some of that energy can be returned to the battery.
It does not recover every joule. Energy losses remain, and friction brakes are still required. But it allows an EV to reclaim energy that would otherwise have been dissipated.
Is an EV really better than a petrol or diesel car?
The tempting answer is a simple yes or no. The scientifically useful answer is more nuanced.
Battery-electric vehicles remove tailpipe combustion, use highly efficient electric drivetrains and can recover some braking energy. But their batteries require materials to be mined, refined, manufactured and eventually reused or recycled.
| Question | Battery Electric Vehicle | Petrol / Diesel Vehicle |
|---|---|---|
| Energy storage | Electrochemical battery pack | Liquid hydrocarbon fuel |
| Main energy converter | Electric traction motor | Internal-combustion engine |
| Tailpipe CO₂ while driving | None | Produced during fuel combustion |
| Drivetrain | Relatively simple electrically driven architecture | Combustion, exhaust and more extensive mechanical systems |
| Braking energy | Part can be recovered through regenerative braking | Mostly dissipated as heat during braking |
| Energy replenishment | Charging time depends on charger, battery and conditions | Liquid-fuel refuelling is typically rapid |
| Infrastructure | Depends on accessible home/public charging network | Mature petrol/diesel refuelling network in most markets |
| Manufacturing challenge | Large traction battery increases material and manufacturing footprint | No large traction battery, but requires engine and associated systems |
| Operational energy source | Electricity — environmental impact depends partly on how it is generated | Petrol or diesel — produces combustion emissions during use |
Where EVs have clear advantages
Where important challenges remain
An electric vehicle is not an environmentally impact-free vehicle. It still requires mining, materials processing, manufacturing, electricity, tyres, roads and infrastructure. The meaningful comparison is the total impact across the complete life cycle of the vehicle.
What happens when we count the battery too?
This is where discussions about EVs often become oversimplified. Manufacturing a large lithium-ion battery requires energy and materials. As a result, producing a battery-electric car can initially create more greenhouse-gas emissions than producing a comparable combustion vehicle.
But vehicle production is only one stage of the life cycle. The vehicle will then be driven for many years.
A 2025 life-cycle study from the International Council on Clean Transportation estimated that battery-electric passenger cars in the European Union produced about 73% lower life-cycle greenhouse-gas emissions than gasoline cars under the electricity-mix and vehicle assumptions used in that study.
The analysis estimated approximately 40% higher production emissions for the battery-electric vehicle, largely because of battery production, but calculated that the initial difference was offset after around 17,000 kilometres of use.
Life-cycle results depend on the electricity mix, battery manufacturing, vehicle size, lifetime distance, efficiency, temperature, charging behaviour and other assumptions. A result calculated for Europe should not automatically be applied to every country or every vehicle.
That is precisely why serious EV comparisons must look beyond the exhaust pipe.
The next EV may be designed in a materials laboratory
The basic idea of an electric car is now well established. Yet the materials inside it are still evolving.
Future progress will not depend on a single miracle material. Different research communities are attacking different limitations.
Solid-state batteries
Replace the conventional liquid electrolyte with a solid electrolyte architecture, with the long-term goal of improving combinations of safety, energy density and performance.
Sodium-ion batteries
Explore sodium-based chemistry as an alternative for applications where cost and material availability may matter more than maximum energy density.
New cathodes
Researchers continue to tune composition and structure to reduce cost, improve performance and alter dependence on constrained critical minerals.
Better power semiconductors
Improved power-electronic materials can reduce conversion losses and help make electric drivetrains smaller and more efficient.
Rare-earth-conscious motors
Motor researchers are exploring ways to use magnetic materials more efficiently or design machines with less dependence on rare-earth permanent magnets.
Battery recycling
Recovering valuable materials from end-of-life batteries could eventually reduce waste and strengthen future material supply chains as larger volumes of batteries retire.
For a century, we asked what engineers could do with an engine. The electric era asks what scientists can do with materials.
Imagine a cathode that stores more energy with fewer constrained minerals. An electrolyte that tolerates faster charging. A magnetic material that gives a motor more torque with less mass. A semiconductor that wastes less energy. A structural alloy that protects passengers while reducing vehicle weight.
Each discovery changes only one part of the vehicle. But together, those changes can reshape the automobile.
That may ultimately be the most important lesson of the electric-car revolution.
The next breakthrough in transportation may not first appear on a highway, in an automobile showroom or on a concept-car stage. It may appear as a new crystal structure, an unfamiliar electrode, a magnetic alloy or a semiconductor wafer sitting on a laboratory bench.
The future of the car may therefore be decided long before it reaches the road. It may be decided under a microscope.
Editorial Sources & Further Reading
MATTERQUEST uses authoritative technical and institutional sources when preparing science and technology features. Readers can explore the primary background material below.
This article is an independent educational and journalistic feature prepared from publicly available technical and institutional sources. EV performance and environmental outcomes vary with battery chemistry, vehicle design, electricity generation, manufacturing location, driving conditions, climate, vehicle lifetime and other assumptions. Comparative figures should therefore be interpreted within the scope of their original studies rather than treated as universal values.