阳极
材料科学
锂(药物)
碳纤维
碳化
法拉第效率
石墨
石墨烯
插层(化学)
化学工程
无机化学
纳米技术
复合数
化学
复合材料
电极
扫描电子显微镜
医学
物理化学
内分泌学
工程类
作者
Xiyin Guan,Jun Xia,Ziwei Wei,Yalan Xing,Ju Guan,Shuai Yin,Heliang Zhou,Fangchao Han,Shichao Zhang,Puheng Yang
出处
期刊:Carbon
[Elsevier]
日期:2024-05-01
卷期号:225: 119143-119143
标识
DOI:10.1016/j.carbon.2024.119143
摘要
Studies of graphite carbon anodes due to their well-defined voltage plateaus at low potentials (0.2 V vs Li/Li+) and relatively high initial Coulombic Efficiency (CE) for lithium-ion batteries (LIBs) are an active area of research. However, the sluggish kinetics of lithium intercalation into conventional graphite anodes leads to metallic lithium plating phenomenon. Herein, the semi-graphitic nitrogen-doped carbon (SGNC) via one-step catalytic carbonization of cocoon silk was proposed to address the above challenges. By doping spiral semi-graphitic carbon materials with nitrogen, the SGNC exhibits an insertion peak of graphite carbon below 0.2 V, as well as an adsorption peak for lithium storage between 0.2 and 3.0V in hard carbon. The optimized nitrogen-doped spiral-like carbon shows an absorption-insertion lithium storage mechanism. As a result, the SGNC anode demonstrates high initial capacity (782 mAh g-1 at 500 mA g-1 and maintained 915 mAh g-1 even after 1200 cycles) and good rate performance. The combined N-doping and nanopore defects in the spiral semi-graphitic carbon can significantly enhance the binding ability for Li-ions, charge transfer ability, and thereby improve the charge transport kinetics of the SGNC, resulting in improved rate capability.
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