Apr
7
Breakthrough Rechargeable Aluminum Battery Announced
April 7, 2015 | 4 Comments
Stanford University scientists have invented the first high-performance aluminum battery that’s fast-charging, long-lasting and inexpensive. The researchers say the new technology could replace many lithium-ion and alkaline batteries in wide use today.
Hongjie Dai, a professor of chemistry at Stanford explains, “We have developed a rechargeable aluminum battery that may replace existing storage devices, such as alkaline batteries, which are bad for the environment, and lithium-ion batteries, which occasionally burst into flames. Our new battery won’t catch fire, even if you drill through it.”
Dai and his colleagues describe their novel aluminum-ion battery in “An Ultrafast Rechargeable Aluminum Ion Battery,” which will be published soon in the advance online edition of the journal Nature.
Aluminum has long been an attractive material for batteries, mainly because of its low cost, low flammability and high-charge storage capacity. For decades, researchers have tried unsuccessfully to develop a commercially viable aluminum-ion battery.
A key challenge has been finding materials capable of producing sufficient voltage after repeated cycles of charging and discharging.
Like all batteries, the aluminum-ion battery consists of two electrodes: a negatively charged anode made of aluminum and a positively charged cathode.
Dai fills us in, “People have tried different kinds of materials for the cathode. We accidentally discovered that a simple solution is to use graphite, which is basically carbon. In our study, we identified a few types of graphite material that give us very good performance.”
For the experimental battery, the Stanford team placed the aluminum anode and graphite cathode, along with an ionic liquid electrolyte, inside a flexible polymer- coated pouch.
Stanford graduate student Ming Gong, co-lead author of the study due to publish in Nature said, “The electrolyte is basically a salt that’s liquid at room temperature, so it’s very safe.” Aluminum batteries are safer than conventional lithium-ion batteries used in millions of laptops and cell phones today, Dai added. “Lithium-ion batteries can be a fire hazard,” he said.
As an example, he pointed to recent decisions by United and Delta airlines to ban bulk lithium-battery shipments on passenger planes.
“In our study, we have videos showing that you can drill through the aluminum battery pouch, and it will continue working for a while longer without catching fire,” Dai said. “But lithium batteries can go off in an unpredictable manner – in the air, the car or in your pocket. Besides safety, we have achieved major breakthroughs in aluminum battery performance.”
One example is ultra-fast charging. Smart phone owners know that it can take hours to charge a lithium-ion battery. But the Stanford team reported an astonishing “unprecedented charging times” of down to one minute with the aluminum prototype.
Durability is another important factor. Aluminum batteries developed at other laboratories usually died after just 100 charge-discharge cycles. But the Stanford battery was able to withstand more than 7,500 cycles without any loss of capacity. “This was the first time an ultra-fast aluminum-ion battery was constructed with stability over thousands of cycles,” the authors wrote.
By comparison, a typical lithium-ion battery lasts about 1,000 cycles.
“Another feature of the aluminum battery is flexibility,” Gong said. “You can bend it and fold it, so it has the potential for use in flexible electronic devices. Aluminum is also a cheaper metal than lithium.”
Dai also notes that in addition to small electronic devices, aluminum batteries could be used to store renewable energy on the electrical grid. “The grid needs a battery with a long cycle life that can rapidly store and release energy,” he explained. “Our latest unpublished data suggest that an aluminum battery can be recharged tens of thousands of times. It’s hard to imagine building a huge lithium-ion battery for grid storage.”
Aluminum-ion technology also offers an environmentally friendly alternative to disposable alkaline batteries. “Millions of consumers use 1.5-volt AA and AAA batteries,” he said. “Our rechargeable aluminum battery generates about two volts of electricity. That’s higher than anyone has achieved with aluminum.”
Dai knows more improvements will be needed to match the voltage of lithium-ion batteries. “Our battery produces about half the voltage of a typical lithium battery,” he said. “But improving the cathode material could eventually increase the voltage and energy density. Otherwise, our battery has everything else you’d dream that a battery should have: inexpensive electrodes, good safety, high-speed charging, flexibility and long cycle life. I see this as a new battery in its early days. It’s quite exciting.”
Exciting and interesting, indeed. Looking over the participants list reveals the other co-lead authors of the study affiliated with Stanford are visiting scientists Meng-Chang Lin from the Taiwan Industrial Technology Research Institute, Bingan Lu from Hunan University, and postdoctoral scholar Yingpeng Wu. Other authors are Di-Yan Wang, Mingyun Guan, Michael Angell, Changxin Chen and Jiang Yang from Stanford; and Bing-Joe Hwang from National Taiwan Normal University.
Nothing was said in the press release about the energy density or volume, environmental operating temperature and other important data. But recharging times measured in a few minutes and cycle counts in five digits is going to seize some consumer and manufacturer attention.
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aluminum! that is super cool! God love you. Praying for wisdom and knowledge for refinements. Let freedom ring!
i is excited lol, that could be a real game changer for solar & wind power
Excellent! When can have have a commercial unit available???? it seems that Google (A Stanford co-partner) or Elon Musk would want to gobble this up quick!
Looks like the right prescription for vehicles. Static storage can even be flow batteries which could get inexpensive organic fluids.
http://www.nature.com/nature/journal/v505/n7482/full/nature12909.html