Researchers at QUT have succeeded in developing lightweight ‘supercapacitors’ that they say can be combined with regular batteries to dramatically boost the power of an electric car.
The supercapacitors – described as a ‘sandwich’ of electrolyte between two all-carbon electrodes - were made by the research team into a thin and extremely strong film with a high power density.
The development means that the film could one day be embedded in a car’s body panels, roof, doors, bonnet and floor - storing enough energy to turbocharge an electric car’s battery in just a few minutes.
According to Marco Notarianni, the car partly powered by its own body panels could be a reality in the next five years.
“Vehicles need an extra energy spurt for acceleration, and this is where supercapacitors come in. They hold a limited amount of charge, but they are able to deliver it very quickly, making them the perfect complement to mass-storage batteries.
“Supercapacitors offer a high power output in a short time, meaning a faster acceleration rate of the car and a charging time of just a few minutes, compared to several hours for a standard electric car battery.”
Dr Liu says one of these cars, after one full charge, should be able to run up to 500km – “similar to a petrol-powered car and more than double the current limit of an electric car."
According to Dr Liu, currently the ‘energy density’ of a supercapacitor is lower than a standard lithium ion (Li-Ion) battery, but its ‘high power density’, or ability to release power in a short time, is far beyond a conventional battery.
“Supercapacitors are presently combined with standard Li-Ion batteries to power electric cars, with a substantial weight reduction and increase in performance.
“In the future, it is hoped the supercapacitor will be developed to store more energy than a Li-Ion battery while retaining the ability to release its energy up to 10 times faster – meaning the car could be entirely powered by the supercapacitors in its body panels.”
Dr Liu says the technology would also potentially be used for rapid charges of other battery-powered devices.
“For example, by putting the film on the back of a smart phone to charge it extremely quickly.”
Another member of the research team, Professor Nunzio Motta, says the technology discovery may be a game-changer for the automotive industry, with significant impacts on financial, as well as environmental factors.
“We are using cheap carbon materials to make supercapacitors and the price of industry scale production will be low.
“The price of Li-Ion batteries cannot decrease a lot because the price of Lithium remains high. This technique does not rely on metals and other toxic materials either, so it is environmentally friendly if it needs to be disposed of.”
The QUT researchers who made this discovery are part of the university’s Battery Interest Group, a cross-faculty group that aims to engage industry with battery-related research.