Contact: Andy Freeberg
DOE/SLAC National Accelerator Laboratory
Caption: Left: Silicon nanoparticles are encased in carbon "yolk shells" and clustered like seeds in a pomegranate. Each cluster has a carbon rind that holds it together, conducts electricity and minimizes reactions with the battery's electrolyte that can degrade performance.
Right: Silicon nanoparticles swell during battery charging to completely fill their yolk shells; no space is wasted, and the shells stay intact.
Credit: Nian Liu, Zhenda Lu and Yi Cui/Stanford
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