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Aluminum battery takes 1 minute to charge

"Millions of consumers use 1.5-volt AA and AAA batteries," says Hongjie Dai. "Our rechargeable aluminum battery generates about two volts of electricity. That's higher than anyone has achieved with aluminum." (Credit: iStockphoto)

Scientists have invented the first high-performance aluminum battery that’s fast-charging, long-lasting, and inexpensive.

“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,” says Hongjie Dai, a professor of chemistry at Stanford University. “Our new battery won’t catch fire, even if you drill through it.”

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.

Graphite cathodes

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 says. “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 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,” says graduate student Ming Gong, co-lead author of the study in Nature.

Battery safety

Aluminum batteries are safer than conventional lithium-ion batteries used in millions of laptops and cell phones today, Dai adds.

“Lithium-ion batteries can be a fire hazard,” he says.

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 says. “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.”

 Bend and fold

One example is ultra-fast charging. Smartphone owners know that it can take hours to charge a lithium-ion battery. But the team reports “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 new 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 write.

By comparison, a typical lithium-ion battery lasts about 1,000 cycles.

“Another feature of the aluminum battery is flexibility,” Gong says. “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, Dai says.

“The grid needs a battery with a long cycle life that can rapidly store and release energy,” he explains. “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 says.

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“Millions of consumers use 1.5-volt AA and AAA batteries,” he says. “Our rechargeable aluminum battery generates about two volts of electricity. That’s higher than anyone has achieved with aluminum.”

But more improvements will be needed to match the voltage of lithium-ion batteries, Dai adds.

“Our battery produces about half the voltage of a typical lithium battery,” he says. “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.”

The US Department of Energy, the Taiwan Industrial Technology Research Institute, the Stanford Global Climate and Energy Project, the Stanford Precourt Institute for Energy, and the Taiwan Ministry of Education funded the work.

Source: Stanford University