Kinetics Enhanced Nitrogen-Doped Hierarchical Porous Hollow Carbon Spheres Boosting Advanced Potassium-Ion Hybrid Capacitors

被引：325

作者：

Qiu, Daping ^{[1
]}

Guan, Jingyu ^{[1
]}

Li, Min ^{[1
]}

Kang, Cuihua ^{[1
]}

Wei, Jinying ^{[1
]}

Li, Yan ^{[1
]}

Xie, Zhenyu ^{[1
]}

Wang, Feng ^{[1
,2
]}

Yang, Ru ^{[1
]}

机构：

[1] Beijing Univ Chem Technol, Beijing Key Lab Electrochem Proc & Technol Mat, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China

[2] Beijing Univ Chem Technol, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, Beijing 100029, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2019年 / 29卷 / 32期

基金：

中国国家自然科学基金;

关键词：

binder; energy storage mechanism; hierarchical porous carbon spheres; nitrogen doping; potassium-ion hybrid capacitors; HIGH-POWER; STORAGE; ELECTRODES; BATTERIES; INTERCALATION;

D O I：

10.1002/adfm.201903496

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Potassium-ion hybrid capacitors (PIHCs) shrewdly combine a battery-type anode and a capacitor-type cathode, exhibiting an energy density close to that of potassium ion batteries and a comparable power density of supercapacitors. However, the rosy scenario is compromised by the sluggish kinetics in the PIHCs device. Herein, the kinetics enhanced nitrogen-doped hierarchical porous hollow carbon spheres (NHCS) are synthesized and successfully applied to PIHCs. As for the K half-cell, NHCS anchored with sodium alginate delivers excellent electrochemical performance. Further evaluation shows that the binder can significantly affect the potassium storage performance of NHCS by adjusting the coatability and ionic conductivity of the NHCS anode. Moreover, kinetic analysis and density functional theory calculations reveal the origin of the superior electrochemical properties of NHCS. As expected, an advanced PIHC device is assembled with a NHCS anode and an activated NHCS cathode, demonstrating an exceptionally high energy/power density (114.2 Wh kg(-1) and 8203 W kg(-1)), along with a long-life capability. The successful construction of high-performance PIHCs in this work opens a new avenue for the development and application of PIHCs in the future.

引用

页数：8

共 55 条

[1] Micron-Sized Nanoporous Antimony with Tunable Porosity for High-Performance Potassium-Ion Batteries [J].