Stanford researchers take two different takes on a new battery, one with more lithium, one with less.

May 18th, 2015 § 2 comments

There are some interesting, if possibly competing, teams working on new battery designs at Standford.

One team, lead by Hongjie Dai is working on an aluminum-ion battery with some interesting benefits. Typical alkaline batteries are terrible for the environment and lithium-ion batteries not only have a bad habit of catching on fire but they are also slow to recharge and only last about 1,000 cycles. The aluminum variety should be able to charge in minutes while also lasting more than 7,500 cycles. The main hurdle, and it’s a big one, is that it currently doesn’t put out enough juice to power something fancy like an iPhone. (source: iflscience.com)

Aluminum-ion battery

Meanwhile, on the other side of Campus Yi Cui is going after the ion side of the lithium-ion battery.

Today, we say we have lithium batteries, but that is only partly true. What we have are lithium ion batteries. The lithium is in the electrolyte, but not in the anode. An anode of pure lithium would be a huge boost to battery efficiency.

There are a number of problems with using lithium as an anode, not the least of which is that when lithium comes into contact with air it bursts into flames. To prevent this researchers are covering the lithium in a protective layer of interconnected carbon domes a bare 20 nanometers thick. They are still working on the coulombic efficiency of the battery but so far the results are quite promising.

(source: news.standord.edu)

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