阳极
碳纤维
硫黄
热解
材料科学
吸附
化学工程
锂(药物)
兴奋剂
动力学
化学
复合材料
电极
有机化学
复合数
冶金
物理化学
物理
工程类
内分泌学
医学
量子力学
光电子学
作者
Ruizi Li,Jianfeng Huang,Jiayin Li,Liyun Cao,Xiaohua Li,Guoxing Lu,Aimin Yu
摘要
Sulfur doping has been regarded an energetic route to optimize the lithium storage properties of carbon-based electrode materials. In this work, sulfur-doped shaddock peel–derived hard carbon is successfully prepared by a KOH- and C2H5NS-assisted pyrolysis procedure. It is demonstrated that sulfur doping has strong effect on surface activation and graphitization enhancement, which results in the significant enhancement of the surface adsorption capacity and reaction kinetics of the hard carbon materials. When employed as a lithium ion batteries (LIBs) anode, the as-obtained hard carbon demonstrates excellent cycling and rate properties, presenting a great specific capacity of 738 mAhg−1 at 50 mAg−1 after 200 cycles, as well as 491 mAhg−1 at 200 mAg−1 after 300 cycles. Even at 1000 and 2000 mAg−1, the hard carbon provides a large rate capacity of 283 and 179 mAhg−1, respectively. Besides, it is revealed that the Li+ storage process is determined by the surface-induced pseudocapacitive process, whose capacitive proportion reach 60% at 0.5 mVs−1. This work suggests that the low cost and eco-friendly sulfur-doped shaddock peel–derived hard carbon is a very prospective LIB anode material.
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