Fast-charging aluminum-ion battery challenges Li-Ion on safety
The researchers describe the technology as offering a safe alternative to many commercial batteries in wide use today.
"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," said Hongjie Dai, a professor of chemistry at Stanford. "Our new battery won’t catch fire, even if you
drill through it."
Dai and his colleagues describe the novel aluminum-ion battery in paper entitled ‘An ultrafast rechargeable aluminum-ion battery’, which will be published in the April 6 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.
An aluminum-ion battery consists of two electrodes: a negatively charged anode made of aluminum and a positively charged cathode.
"People have tried different kinds of materials for the cathode," Dai said. "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.
"The electrolyte is basically a salt that’s liquid at room temperature, so it’s very safe," said Stanford graduate student Ming Gong, co-lead author of the Nature
study.
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," advised Dai.
"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. Smartphone owners know that it can take hours to charge a lithium-ion battery. But the Stanford team reported "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."
In addition to small electronic devices, aluminum batteries could be used to store renewable energy on the electrical grid, suggested Dai.
"The grid needs a battery with a long cycle life that can rapidly store and release energy," explained Dai. "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, Dai said.
"Millions of consumers use 1.5-volt AA and AAA batteries," said Dai. "Our rechargeable aluminum battery generates about two volts of electricity. That’s higher than anyone has achieved with aluminum."
"Our battery produces about half the voltage of a typical lithium battery," said Dai. "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."
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