I'm mildly skeptical...A new kind of portable electrochemical battery that can produce thousands of hours of power - and soon replace the expensive regular or rechargeable batteries in hearing aids and sensors and eventually in cellphones, laptop computers and even electric cars - has been developed at Haifa's Technion-Israel Institute of Technology.
Prof. Yair Ein-Eli in his Technion lab, where he invented a battery that is potentially as eco-friendly as sand.
Photo: Technion
The unique battery is based on silicon as a fuel that reverts to its original sand. The battery can also be left on the shelf for years and inserted into a device to provide immediate power.
A new ultrabattery?
A new ultrabattery?
http://www.jpost.com/servlet/Satellite? ... 5547719698
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The abstract is here as 20. Silicon–air batteries:Betruger wrote:Do you guys not have access to the paper, or does that not detail what you're looking for either?
I couldn't find the full text online.A new “metal”–air battery based on silicon–oxygen couple is described. Silicon–air battery employing EMI·2.3HF·F room temperature ionic liquid (RTIL) as an electrolyte and highly-doped silicon wafers as anodes (fuels) has an undetectable self-discharge rate and high tolerance to the environment (extreme moisture/dry conditions). Such a battery yields an effectively infinite shelf life with an average working voltage of 1–1.2 V. Silicon–air battery can support relatively high current densities (up to 0.3 mA/cm2) drawn from flat polished silicon wafers anodes. Such batteries may find immediate applications, as they can provide an internal, built-in autonomous and self sustained energy source.
Isn't 0.3 mA/cm2 rather wimpy? I quick google of Lithium Ion density suggests they average 10 mA/cm2.Art Carlson wrote:The abstract is here as 20. Silicon–air batteries:Betruger wrote:Do you guys not have access to the paper, or does that not detail what you're looking for either?I couldn't find the full text online.A new “metal”–air battery based on silicon–oxygen couple is described. Silicon–air battery employing EMI·2.3HF·F room temperature ionic liquid (RTIL) as an electrolyte and highly-doped silicon wafers as anodes (fuels) has an undetectable self-discharge rate and high tolerance to the environment (extreme moisture/dry conditions). Such a battery yields an effectively infinite shelf life with an average working voltage of 1–1.2 V. Silicon–air battery can support relatively high current densities (up to 0.3 mA/cm2) drawn from flat polished silicon wafers anodes. Such batteries may find immediate applications, as they can provide an internal, built-in autonomous and self sustained energy source.
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http://en.wikipedia.org/wiki/Cathode[quote]A widespread misconception is that cathode polarity is always negative. ... Consequently, as can be seen from the following examples, in a device which consumes power the cathode is negative, and in a device which provides power the cathode is positive[/quote]I always have trouble with this too.krenshala wrote:Um, isn't the cathode the negative terminal? Or should I ignore this because its too technical for mainstream media to get correct?The Article wrote:Ordinary portable batteries are composed of a positive electrode called a cathode and a negative one called an anode.