Whether it makes it to market or not is anyone's guess, but they really are claiming that their new tech stores lots more energy in the battery.
Quote:
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“Now we almost have the best of both worlds,” Kung said. “We have much higher energy density because of the silicon, and the sandwiching reduces the capacity loss caused by the silicon expanding and contracting. Even if the silicon clusters break up, the silicon won’t be lost.”
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(bold added)