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caddieo
Member
As of yesterday evening, Elon Musk already commented on this. Quote: "Battery "breakthroughs" need to state power *and* energy density (not the same thing), plus how long they last. They usually fail on energy. Unquote.
voyager
Active Member
The aluminum-ion cell isn't perfect (yet) as it can only produce about 2 volts, far less than the 3.6V that lithium-ion an muster. Plus aluminum cells only carry 40 watts of electricity per kilogram compared to lithium's 100 to 206 W/kg power density.
Stanford's aluminum battery fully charges in just one minute
Doesn't that mean that lightweight (base weight excl. batteries) electric cars are better 'positioned' to benefit from this development?
Stanford's aluminum battery fully charges in just one minute
Doesn't that mean that lightweight (base weight excl. batteries) electric cars are better 'positioned' to benefit from this development?
Johan
Ex got M3 in the divorce, waiting for EU Model Y!
That cool. Although I'd like to know how they would plan to push that much Power through a micro-USB og Lightning Connector 
voyager
Active Member
The BIG-BIG bonus (not to use the term game changer) of course is.... Recharge faster than you can fill up!
Btw Johan, that is a very cool-looking estate version of the Model S I noticed as your avatar!
Btw Johan, that is a very cool-looking estate version of the Model S I noticed as your avatar!
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JRP3
Hyperactive Member
Tesla/Panasonic cells are at the 250Wh/kg level.
General note, we now have three different threads discussing this same chemistry, I think all new unproven battery announcments should just get dumped into the "Batteries Stupid" thread until such time as a battery warrants more than a few lines of discussion.
voyager
Active Member
I asked Stanford U. for confirmation.... The same hype as Lockheed Martin's nuclear fusion thing last year? More harmful to reputations than beneficial in terms of pitching.
JRP3
Hyperactive Member
Also, it's Watt hour per kilogram, not Watts per kilogram, since it's measuring energy density.
wcalvin
Member
Article in latest Nature:
The Al battery pouch cell is mechanically bendable and foldable (Supplementary Video 1) owing to the flexibility of the electrode and separator materials. Further, we drilled through Al battery pouch cells during battery operation and observed no safety hazard, owing to the lack of flammability of the ionic liquid electrolyte in air (see Supplementary Video 2).
Nature 520, 324–328 (16 April 2015) doi:10.1038/nature14340We have developed a new Al-ion battery using novel graphitic cathode materials with a stable cycling life up to 7,500 charge/discharge cycles without decay at ultrahigh current densities. The present Al/graphite battery can afford an energy density of ~40 W h kg[SUP]–1[/SUP] (comparable to lead–acid and Ni–MH batteries, with room for improvement by optimizing the graphitic electrodes and by developing other novel cathode materials) and a high power density, up to 3,000 W kg[SUP]–1[/SUP](similar to supercapacitors). We note that the energy/power densities were calculated on the basis of the measured ~65 mA h g[SUP]–1[/SUP] cathode capacity and the mass of active materials in electrodes and electrolyte. Such rechargeable Al ion batteries have the potential to be cost effective and safe, and to have high power density.
The Al battery pouch cell is mechanically bendable and foldable (Supplementary Video 1) owing to the flexibility of the electrode and separator materials. Further, we drilled through Al battery pouch cells during battery operation and observed no safety hazard, owing to the lack of flammability of the ionic liquid electrolyte in air (see Supplementary Video 2).
An ultrafast rechargeable aluminium-ion battery
- Meng-Chang Lin,
- Ming Gong,
- Bingan Lu,
- Yingpeng Wu,
- Di-Yan Wang,
- Mingyun Guan,
- Michael Angell,
- Changxin Chen,
- Jiang Yang,
- Bing-Joe Hwang
- & Hongjie Dai
Nature 520, 324–328 (16 April 2015) doi:10.1038/nature14340We have developed a new Al-ion battery using novel graphitic cathode materials with a stable cycling life up to 7,500 charge/discharge cycles without decay at ultrahigh current densities. The present Al/graphite battery can afford an energy density of ~40 W h kg[SUP]–1[/SUP] (comparable to lead–acid and Ni–MH batteries, with room for improvement by optimizing the graphitic electrodes and by developing other novel cathode materials) and a high power density, up to 3,000 W kg[SUP]–1[/SUP](similar to supercapacitors). We note that the energy/power densities were calculated on the basis of the measured ~65 mA h g[SUP]–1[/SUP] cathode capacity and the mass of active materials in electrodes and electrolyte. Such rechargeable Al ion batteries have the potential to be cost effective and safe, and to have high power density.
A phone battery has a capacity of c.a. 1800mAh at 3.7V (~6.7Wh). Charging this in one minute would require a current of ~81 amps from the 5V USB port. Not going to happen w/out superconductors and massive advances in small-scale power electronic components.
Every time I see these new "ultra-fast" charge batteries I wonder if they actually have consulted real engineers to see if these batteries could actually be used at the claimed rates.
Every time I see these new "ultra-fast" charge batteries I wonder if they actually have consulted real engineers to see if these batteries could actually be used at the claimed rates.
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