Discussion in 'Technical' started by stg58, Apr 8, 2015.

  1. stg58

    stg58 Monkey+++ Founding Member

    Interesting hopefully it is the real deal.
    Flexible aluminum battery charges fast, stable for over 7,000 cycles | Ars Technica
    Aluminum-Ion Batteries Are Flexible, Fast-Charging, And Won't Catch On Fire | Popular Science
    Almost all of the electronic devices that we carry around with us all day now rely on one key, but increasingly antiquated, technology: the lithium-ion battery. A mainstay of rechargeable power for the last couple decades, this battery technology has gotten only minor refinements. But a substantial improvement in stored power may be in the offing, thanks to researchers at Stanford University, who have developed a new battery technology based on aluminum.

    This isn't the first time that aluminum-based batteries have been investigated. The material has a number of advantages over lithium: it's flexible, allowing it to be folded or bent without losing power; can be charged in a minute instead of hours; and is incredibly durable--according to Stanford chemistry professor Hongjie Dai, you can even drill a hole through the battery and it will continue to work. That's good for volatility too: compromise a lithium-ion battery and you'll likely see some sparks or flame, but the materials in this new battery are all non-reactive. And, aluminum is cheaper than lithium, too.

    All good things, so why haven't we seen more aluminum batteries? The catch to date has been finding another material to work with aluminum in creating energy. The Stanford team ended up using our old friend graphene to play the cathode to aluminum's anode. But though that's helped unlock better performance, including more charge cycles--7,500 versus the 1,000 you'd likely get out of a Li-ion battery--aluminum-ion's woes aren't all behind it. The voltage provided by an aluminum-ion battery is only about half of that what you'd get from a lithium-ion cell. And, as Ars Technica points out, the overall power density--the amount of juice you can store in a battery vis-a-vis its size--more closely resembles the large lead-acid battery you'd find in your car.
  2. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    Flexible, fast-charging aluminum-ion battery offers safer alternative to lithium-ion

    "You're right Joel, I've read their paper and the energy density is a meager 40 Wh/kg which is 3 to 4 times less than any Li-ion battery.

    Also, they couldn"t compete with lithium's voltage because the reduction potential of the reaction Al+ + 3 e- = Al at the cathode is 1.7V against the reaction Li+ + e- = Li, which has a reduction potential of 3.04 V.

    This means that the maximum voltage is two times lower than lithium-ion.

    Finally, they use a ionic liquid which is expensive and most are quite toxic."

    If this is true, it is unlikely we will ever see them hit the market for consumer use. (Though solar/wind off grid batteries might be an option). But they will not be cost effective.
  3. mysterymet

    mysterymet Monkey+++

    There are also aluminum air batteries where the aluminum is consumed. You refill them by putting in new aluminum.
  4. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    Aluminum is a very dirty metal. How pure would it need to be? If it could live of scraps, that's one thing, but buying aluminum gets expensive quickly.
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