阳极
十二面体
碳纤维
离子
电化学
吸附
材料科学
电极
钒
纳米技术
结晶学
分析化学(期刊)
化学工程
原子物理学
化学
物理
物理化学
复合数
复合材料
工程类
色谱法
有机化学
冶金
作者
Zongjing Lu,Denglei Gao,Yi Ding,Yijun Yang,Xi Wu,Jiannian Yao
出处
期刊:ACS central science
[American Chemical Society]
日期:2020-07-21
卷期号:6 (8): 1451-1459
被引量:22
标识
DOI:10.1021/acscentsci.0c00593
摘要
Doping in carbon anodes can introduce active sites, usually leading to extra capacity in Li-ion batteries (LIBs), but the underlying reasons have not been uncovered deeply. Herein, the dodecahedral carbon framework (N-DF) with a low nitrogen content (3.06 wt %) is fabricated as the anode material for LIBs, which shows an extra value of 298 mA h g-1 during 250 cycles at 0.1 A g-1. Various characterizations and theoretical calculations demonstrate that the essence of the extra capacity mainly stems from non-coplanar sp2/sp3 hybridized orbital controlling non-Euclidean geometrical structure, which acts as new Li-ion active sites toward the excess Li+ adsorption. The electrochemical kinetics and in situ transmission electron microscope further reveal that the positive and negative curvature architectures not only provide supernumerary Li+ storage sites on the surface but also hold an enhanced (002) spacing for fast Li+ transport. The sp2/sp3 hybridized orbital design concept will help to develop advanced electrode materials.
科研通智能强力驱动
Strongly Powered by AbleSci AI