废头发衍生的硫掺杂碳负极材料的储锂性能

Li-storage Performances of Sulfur-doped Carbon Anode Derived From the Waste Hairs

理发店每天都会产生大量主要成分为角蛋白、含有氮、碳、硫和氧等元素的废弃头发,它是一种良好的生物质碳前体,将其直接掩埋或焚烧会造成资源浪费及环境污染。本研究通过碳化反应从废弃头发中提取出硫掺杂碳材料,并考察该材料的形貌、微观结构及储锂性能。研究结果表明,硫掺杂碳为无定型结构,由粒径不等的微/纳颗粒组成;在电流密度0.5A·g^(-1)充/放电时,电极的可逆容量稳定在376.7mAh·g^(-1),且在1.0A·g^(-1)循环充/放电500圈时的可逆储锂容量为216.6mAh·g^(-1);锂离子扩散系数为4.5×10^(-7)cm^(2)·s^(-1),高于相关文献报道的结果。该研究结果对废弃头发回收利用有积极的推动作用。

Large quantity of waste hairs are produced in the barber shops every day,which is mainly composited of keratin,N,C,S,O elements and so on.Landfill or incineration will cause the environment pollution or the waste of resource.Therefore,sulfur-doped carbon material is extracted from the waste hairs by carbonization reaction,and the morphology,micro-structure and Li-storage performances were further evaluated in this work.The results suggest that sulfur-doped carbon consisted of many micro/nano particles with different particle sizes.The reversible capacity at the current density of 0.5 A·g^(-1) is about 376.7 mAh·g^(-1) and the reversible Listorage capacity is 216.6 mAh·g^(-1) at 1 A·g^(-1) after 500 cycles.Li+diffusion coefficient is 4.5×10^(-7) cm^(2)·s^(-1),higher than the result in literature.