Interesting comments here on use of different chemistry batteries in electric bikes. Comments pre date recent events.
lithium cobalt battery v lifepo4
Lithium batteries with cobalt cathodes were abandoned for e-bikes after numerous fires caused by their intrinsically dangerous properties. Batteries with manganese cathodes replaced them.
and
Lithium Cobalt have a higher power density, can defo get more Wh/kg than LiFePo4, the difference is the Li-Co is the most dangerous type which had a bad past full of explosions. LiFePO4 is on the other hand the safest one but weight more and can get less Wh/kg. LiFePo4 are most suitable for heavier vehicles (cars, mopeds) where weight isn't such an issue.