A breakthrough in electric vehicle fast charging battery design from Penn State has enabled a 10-minute charge time for a typical EV battery.
The record-breaking combination of a shorter charge time and more energy required for longer travel range came from heating the battery to a Goldilocks Zone which has proven difficult for engineers thus far.
Their findings are hoped to accelerate the sale of EVs, and were announced on October 12th, in the journal Nature.
“The need for smaller, faster-charging batteries is greater than ever,” said Chao-Yang Wang, Professor of Mechanical Engineering at Penn State and lead author on the study.
“There are simply not enough batteries and critical raw materials, especially those produced domestically, to meet anticipated demand.”
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In August, California’s Air Resources Board passed an extensive plan to restrict and ultimately ban the sale of gasoline-powered cars within the state. By 2035, the largest auto market in the United States will effectively retire the internal combustion engine.
If new car sales are going to shift to battery-powered electric vehicles (EVs), Wang explained, they’ll need to overcome two major drawbacks: they are too slow to recharge and too large to be efficient and affordable. Instead of taking a few minutes at the gas pump, depending on the battery, some EVs can take all day to recharge.
“Our fast-charging technology works for most energy-dense batteries and will open a new possibility to downsize electric vehicle batteries from 150 to 50 kWh without causing drivers to feel range anxiety,” said Wang, whose lab partnered with State College-based startup EC Power to develop the technology.
“The smaller, faster-charging batteries will dramatically cut down battery cost and usage of critical raw materials such as cobalt, graphite and lithium, enabling mass adoption of affordable electric cars.”
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The technology relies on internal thermal modulation, an active method of temperature control to demand the best performance possible from the battery, Wang explained.
Batteries operate most efficiently when they are hot, but not too hot. Keeping batteries consistently at just the right temperature has been a major challenge for battery engineers. Historically, they have relied on external, bulky heating and cooling systems to regulate battery temperature, which respond slowly and waste a lot of energy.
Wang and his team decided to instead regulate the temperature from inside the battery. The researchers developed a new battery structure that adds an ultrathin nickel foil as the fourth component besides anode, electrolyte and cathode.
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Acting as a stimulus, the nickel foil self-regulates the battery’s temperature and reactivity which allows for 10-minute fast charging on just about any EV battery, Wang explained.
“True fast-charging batteries would have immediate impact,” the researchers write. “Since there are not enough raw minerals for every internal combustion engine car to be replaced by a 150 kWh-equipped EV, fast charging is imperative for EVs to go mainstream.”
The study’s partner, EC Power, is working to manufacture and commercialize the fast-charging battery for an affordable and sustainable future of vehicle electrification.
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