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Most people brake and slow down in just a few seconds. No lithium ion battery can charge from, say 25% to 75% in that amount of time. So a lithium ion battery has to be made bigger, which adds to weight and cost, and the extra size doesn't really help with anything other than extending the life of the battery unless you go engine braking down a long hill.
Also batteries tend to charge up as fast as or slower than they can discharge. With a system that quickly charges up and slowly discharges it would be nice to have something like a super capacitor that can charge as fast as need be and still be sized to whatever capacity makes sense for stoping from 80mpg to 0.
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