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Hard carbon microspheres (HCS) exhibit a highly reversible capacity of 262 mAh g−1 for K-ion batteries. They present a superior rate capability for K-ions to Na-ions, where at 2C, HCS/K cells deliver 190 mAh g−1 in contrast to 97 mAh g−1 from HCS/Na cells. It is determined that the K-ion diffusion coefficient of HCS is higher than that of Na-ions.
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Jian et al. (2015) studied this question.
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