Energizer Bunny Keeps on Going.

nsaspook

Joined Aug 27, 2009
16,321
People have looked at his battery. The science ( Goodenough's battery has pure metallic lithium or sodium on both sides, where is the energy band-gap from differing eletro-chemical reactions ?) is possible ( Fermi level differences?) but the engineering of a mass production product is more than science.

http://pubs.rsc.org/en/Content/ArticleLanding/2017/EE/C6EE02888H#!divAbstract
http://www.computerworld.com/articl...thium-ion-battery-responds-to-skepticism.html
https://medium.com/the-unfortunate-tetrahedron/a-potential-big-deal-in-batteries-298c7ad9543a
“In this case, scientists wonder how it is possible to strip lithium from the anode and plate it on a cathode current collector to obtain a battery voltage since the voltage is the difference in the chemical potentials (Fermi energies) between the two metallic electrodes,” Goodenough stated. “The answer is that if the lithium plated on the cathode current collector is thin enough for its reaction with the current collector to have its Fermi energy lowered to that of the current collector, the Fermi energy of the lithium anode is higher than that of the thin lithium plated on the cathode current collector.”

This raises two interesting questions:

  1. How much lithium has to exist on both electrodes before the potential difference is that of lithium vs. lithium? The answer to this is very little. Electrodeposited lithium on copper, at room temperature, forms a thin alloy, and then once this alloy is formed the interface, and fermi level, becomes that of pure lithium. This interlayer, at most, is on the order of 10 nm, and is more likely 1 or 2 atomic layers and less than 1 nm.
  2. Based on that amount, what is the practical capacity accessible lithium that can be deposited per unit area of current collector/“redox center” before the super capacity effect is diminished? Well, let’s assume 10 nm.
 
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cmartinez

Joined Jan 17, 2007
8,759
But You are good at knowing your weaknesses.
Emoji Smiley-19.png Clearly... playing the victim doesn't work with you... so let me take a more aggressive approach... I don't give a tiny rat's sphincter what you think... Emoji Smiley-12.png

I think I'll stick to this thread now... it's become far more interesting than mine Emoji Smiley-51.png
 
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