Quote:
Originally Posted by flack
Yeah right
Heres an article I just found after I followed your link
http://www.ehow.com/how_5941616_disc...o-battery.html
They actually suggest to discharge lipos for storage without a word about never going under 3v/cell....
thats just plain stupid and dangerous
EDIT: haha even wost : |
LOL! Okay that writer is retarded.
I will try to find a legit source but think about it from a chemistry standpoint. Once you overcharge, you WILL get Li metal not Li ions form on the surface of the cathode. This is because the lattice cannot absorb any more ions so it begins to coat the surface. Li ions are safe but that Li metal is VERY reaction, especially to moisture. That Li is going to bond the Oxygen of the water, forming Lithium Oxide and H2 gas. BOOM!!!
Especially when there's enough H2 gas stored in the cell, the shell ruptures, and the batteries have high discharge currents. Little rupture and arch is all it takes. FIRREEEEEEEE muahahahahahahahahaha
Similar concept with undervoltage. If you do not keep enough Li ions in the lattice, the entire structure will begin to collapse. Since ions have been in there, the bond lengths have all been stretched and will need support to keep them there. Once collapsed, the structure will not be able to absorb many ions so Li+ will coat the surface of the cathode. Mix with H2O and boom!
I think Chingyul was looking at this phrase of this article:
Quote:
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These devices occupy useful space inside the cells, reduce their reliability[citation needed]; ,and irreversibly disable the cell when activated. They are required because the anode produces heat during use, while the cathode may produce oxygen. These devices and improved electrode designs reduce/eliminate the risk of fire or explosion.
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http://en.wikipedia.org/wiki/Lithium-ion_battery