Mazda is doing exactly that. They are using caps to store the power as a cap can accept a large charge quickly.
I think what we will see in the near future is a variation on what honda did with the Insight years ago. They may not use the same pancake configuration. They could simply go with a much heavier duty bolt on alternator that runs at a considerably higher voltage. I believe they are currently looking at 48V systems.
Such a system could eliminate a separate starter. Also, going with 48 volts means lighter wiring and better efficiency all around. Once such a system is used on a mass scale, it would not be that much more expensive than today's charging systems.
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