TY - JOUR
T1 - A Large Scalable and Low-Cost Sulfur/Nitrogen Dual-Doped Hard Carbon as the Negative Electrode Material for High-Performance Potassium-Ion Batteries
AU - Liu, Yu
AU - Dai, Haodong
AU - Wu, Lu
AU - Zhou, Weibin
AU - He, Liang
AU - Wang, Weigang
AU - Yan, Wenqi
AU - Huang, Qinghong
AU - Fu, Lijun
AU - Wu, Yuping
N1 - Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Among the negative electrode materials for potassium ion batteries, carbon is very promising because of its low cost and environmental benignity. However, the relatively low storage capacity and sluggish kinetics still hinder its practical application. Herein, a large scalable sulfur/nitrogen dual-doped hard carbon is prepared via a facile pyrolysis process with low-cost sulfur and polyacrylonitrile as precursors. The dual-doped hard carbon exhibits hierarchical structure, abundant defects, and functional groups. The material delivers a high reversible potassium storage capacity and excellent rate performance. In particular, a high reversible capacity of 213.7 and 144.9 mA h g−1 can be retained over 500 cycles at 0.1 A g−1 and 1200 cycles at 3 A g−1, respectively, demonstrating remarkable cycle stability at both low and high rates, superior to the other carbon materials reported for potassium storage, to the best of the authors' knowledge. Structure and kinetics studies suggest that the dual-doping enhances the potassium diffusion and storage, profiting from the formation of a hierarchical structure, introduction of defects, and generation of increased graphitic and pyridinic N sites. This study demonstrates that a facile and scalable pyrolysis strategy is effective to realize hierarchical structure design and heteroatom doping of carbon, to achieve excellent potassium storage performance.
AB - Among the negative electrode materials for potassium ion batteries, carbon is very promising because of its low cost and environmental benignity. However, the relatively low storage capacity and sluggish kinetics still hinder its practical application. Herein, a large scalable sulfur/nitrogen dual-doped hard carbon is prepared via a facile pyrolysis process with low-cost sulfur and polyacrylonitrile as precursors. The dual-doped hard carbon exhibits hierarchical structure, abundant defects, and functional groups. The material delivers a high reversible potassium storage capacity and excellent rate performance. In particular, a high reversible capacity of 213.7 and 144.9 mA h g−1 can be retained over 500 cycles at 0.1 A g−1 and 1200 cycles at 3 A g−1, respectively, demonstrating remarkable cycle stability at both low and high rates, superior to the other carbon materials reported for potassium storage, to the best of the authors' knowledge. Structure and kinetics studies suggest that the dual-doping enhances the potassium diffusion and storage, profiting from the formation of a hierarchical structure, introduction of defects, and generation of increased graphitic and pyridinic N sites. This study demonstrates that a facile and scalable pyrolysis strategy is effective to realize hierarchical structure design and heteroatom doping of carbon, to achieve excellent potassium storage performance.
KW - hard carbon
KW - large scalable
KW - negative electrode materials
KW - potassium-ion batteries
KW - sulfur/nitrogen dual-doping
UR - http://www.scopus.com/inward/record.url?scp=85070107697&partnerID=8YFLogxK
U2 - 10.1002/aenm.201901379
DO - 10.1002/aenm.201901379
M3 - 文章
AN - SCOPUS:85070107697
SN - 1614-6832
VL - 9
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 34
M1 - 1901379
ER -