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Hierarchically Porous N‐Doped Carbon Fibers as a Free‐Standing Anode for High‐Capacity Potassium‐Based Dual‐Ion Battery
Author(s) -
Zhang Meng,
Shoaib Muhammad,
Fei Huilong,
Wang Tao,
Zhong Jiang,
Fan Ling,
Wang Lei,
Luo Haiyan,
Tan Shan,
Wang Yaya,
Zhu Jian,
Hu Jiawen,
Lu Bingan
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901663
Subject(s) - anode , materials science , battery (electricity) , cathode , carbon fibers , chemical engineering , potassium ion battery , nanotechnology , energy storage , graphite , electrode , composite material , electrical engineering , composite number , chemistry , power (physics) , physics , quantum mechanics , lithium vanadium phosphate battery , engineering
Abstract Potassium‐based dual‐ion batteries (KDIBs) have emerged as a new generation of rechargeable batteries, due to their high cell voltage, low cost, and the natural abundance of potassium resources. However, the low capacity and poor cycling stability largely hinder the further development of KDIBs. Herein, the fabrication of hierarchically porous N‐doped carbon fibers (HPNCFs) as a free‐standing anode for high‐performance KDIBs is reported. With a free‐standing hierarchical structure (micro/meso/macropores and nanochannels) and high‐content of nitrogen doping, the HPNCFs not only provide intrinsic electron pathways and efficient ion transport channels, but also afford sufficient free space to tolerate the volume change during cycling. Consequently, the KDIBs made from a graphite cathode and an optimized HPNCFs anode deliver a high reversible capacity of 197 mAh g −1 at a specific current of 50 mA g −1 , and excellent cycling stability (65 mAh g −1 after 346 cycles at a specific current of 100 mA g −1 , the capacity calculation of the KDIBs is based on the mass of the anode). These results indicate that the properly designed HPNCFs can effectively improve the capacity and cycling stability of the KDIBs, indicating a great potential for applications in the field of high‐performance energy‐storage devices.