Superior first-cycle Coulomb efficiency (above 80%) is displayed by filter paper-derived micro-nano structure hard carbon, and it delivers a high reversible capacity of 286 mAh g−1 after 100 cycles as the anode for Na-ion battery at 20 mA g−1. These advantageous performance characteristics are attributed to the unique micro-nano structure, which reduced the first irreversible capacity loss by limiting the contact between the electrode and electrolyte, and enhanced the capacity by accelerating electron and Na-ion transfer through inter-connected nano-particles and nano-pores, respectively. The good electrochemical performance indicates that this low-cost hard carbon could be a promising anode for Na-ion batteries.
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机译：滤纸衍生的微纳结构硬碳具有优异的第一循环库仑效率（80％以上），经过100次循环后，它具有286 capacitymAh g -1 的高可逆容量。 Na离子电池的阳极，电流为20 mA g -1 。这些有利的性能特征归因于独特的微纳米结构，它通过限制电极与电解质之间的接触减少了第一次不可逆的容量损失，并通过加速电子和Na离子通过相互连接的纳米粒子的转移而提高了容量和纳米孔。良好的电化学性能表明，这种低成本的硬碳可以作为Na离子电池的有希望的阳极。
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