标题：
Nitrogenated Urchin-like Nb2O5 Microspheres with Extraordinary Pseudocapacitive Properties for Lithium-Ion Capacitors
点击次数：
所属单位：
材料科学与技术学院
发表刊物：
CHEMELECTROCHEM
关键字：
activated carbon lithium-ion capacitors niobium oxide nitrogen doping surface nitrogenization
摘要：
Recently, lithium-ion capacitors (LICs) combining the complementary characteristics of both lithium-ion batteries (LIBs) and supercapacitors, have received exhaustive investigation to meet the increasing demands for clean energy. However, their commercial application has been limited by the mismatch of charge-storage capacity and electrode kinetics between the capacitor-type cathode and battery-type anode. Thus, developing a novel high-power insertion anode material is the key to realizing excellent energy and power densities for LICs. Here, 3D hierarchical Nb2O5 microspheres assembled by surface-nitrogenated nanowires have been synthesized through a unique anti-solvent precipitation-assisted solvothermal route accompanied by a nitrogenization treatment, which can be successfully used for advanced LICs configuration. Owing to the high aspect ratio of ultrathin nanowires, unique pore structures caused by nitridation, improved electronic conductivity, and favorable kinetic stemming from pseudocapacitive behavior, the resultant nitrogenated Nb2O5 microspheres can deliver a high capacity of 205.3mAhg(-1) with remarkable rate capability and long lifespan. When constructed into a new LIC device with peanut-shell derived carbon (PSC) cathode, an exceptionally high energy density of approximate to 83.5Whkg(-1) and a high power density of 10kWkg(-1) with prominent cycling stability are realized. Significantly, the simultaneous manipulation of superstructure design and surface nitrogenization in novel anode material provides new opportunities to boost the energy and power densities for hybrid-ion capacitors.
ISSN号：
2196-0216
是否译文：
否
发表时间：
2018-06-04
合写作者：
陈志杰,李洪森,卢晓霞,吴朗源,蒋江明,蒋松柏,王君君,张校刚
通讯作者：
张校刚,窦辉
发表时间：
2018-06-04
学位：理学博士学位
职称：教授
所在单位：材料科学与技术学院