Next Big Thing For Rechargeable Batteries
Reza Shahbazian-Yassar thinks sodium might be the next big thing in rechargeable batteries.
“Some people think lithium will be the next oil,” says Shahbazian-Yassar, an associate professor of mechanical engineering–engineering mechanics at Michigan Technological University.
Sodium may be a good alternative. “After lithium, it’s the most attractive element to be used in batteries,” Shahbazian-Yassar said. It’s also cheap and abundant; seawater is full of it.
It has just one drawback: sodium atoms are big, about 70 percent larger in size than lithium atoms. “When the atoms are too big, that’s problematic,” says Shahbazian-Yassar, because they can cause a battery’s electrodes to wear out faster. “Imagine bringing an elephant through the door into my office. It’s going to break down the walls.”
Before a long-lasting rechargeable sodium battery can be developed, scientists need to better understand these challenges and develop solutions. With a $417,000 National Science Foundation grant, Shahbazian-Yassar is leading that effort at Michigan Tech. “We have an opportunity to tackle some of the fundamental issues relating to charging and discharging of batteries right here,” he said. “We have a unique tool that lets us observe the inside of a battery.”
Using a transmission electron microscope, Shahbazian-Yassar and his team can peer inside and see how a battery is charging and discharging at the atomic level. “We will study these fundamental reactions and find out what materials and electrodes will do a better job hosting the sodium.”
Sodium ion batteries would not have to be as good as lithium ion batteries to be competitive, Shahbazian-Yassar notes. They would just need to be good enough to satisfy the consumer. And they could make electric cars more affordable, and thus more attractive. Plus, they could reduce our dependence on fossil fuels, particularly if the batteries were charged using renewable energy sources. That would lead to two laudable goals: greater energy independence and less pollution worldwide.
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