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Old 08-07-2023, 12:23 AM
Sparty Sparty is offline
Join Date: Mar 2009
Posts: 1,880
Default For Paul - LiFePo4 safe as lead batteries

Hi Paul, for some reason the Video didn't load. But I guess you are worried that Electric Vehicles are a fire risk and that even though the occurrence of lithium battery vehicle fires is a very small fraction of car fires that this needs to be addressed. The good news is that companies like BYD and others are now shipping with LiFePo4 batteries.

I have covered Lithium batteries on my site

"Chemical and Thermal Stability of Lithium Iron Phosphate (LiFePO4)
LiFePO4 is an intrinsically safer cathode material than cobalt oxide or manganese oxide cathode. Technically speaking, the fully “lithiated” and “unlithiated” states of LiFePO4 are physically similar, which means it’s structurally stable. The iron phosphate oxide bond is stronger than the cobalt oxide bond, so when it is subjected to overcharge it maintains its physical structure, while other lithium chemistries expand producing excessive heat, which leads to thermal runaway.

LiFePO4 chemistry is highly robust during the oxygen loss that accompanies the charge cycle, thereby significantly reducing
the exothermic reaction that is associated with other lithium chemistries. The heat produced by the chemical reaction in a
LiFePO4 battery during overcharge is only 5.5% of the heat that is produced by a lithium cobalt chemistry. Unlike other lithium
chemistries, LiFePO4 batteries can operate at temperatures up to 65°C (150°F) and thermal runaway temperature is at a high 270°C

When abuse does occur, the phosphate based cathode material will not burn and is not prone to thermal runaway. Lithium
phosphate cells are incombustible in the event of mishandling during charge or discharge, they are more stable under overcharge
or short circuit conditions and they can withstand high temperatures without decomposing.
From the viewpoint of safety performance, a LiFePO4 battery is similar to a lead-acid battery."


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