Zheng Peng, Liu Ting, Guo Shouwu
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xian 710021, Shaanxi, P. R. China.
Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
Sci Rep. 2016 Oct 18;6:35620. doi: 10.1038/srep35620.
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 after 100 cycles as the anode for Na-ion battery at 20 mA g. 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.
滤纸衍生的微纳结构硬碳展现出优异的首次循环库仑效率（高于80%），并且作为钠离子电池的负极，在20 mA g的电流密度下循环100次后，其可逆容量高达286 mAh g。这些优异的性能特性归因于其独特的微纳结构，该结构通过限制电极与电解质之间的接触减少了首次不可逆容量损失，并分别通过相互连接的纳米颗粒和纳米孔加速电子和钠离子传输来提高容量。良好的电化学性能表明，这种低成本的硬碳可能是一种很有前景的钠离子电池负极材料。
