期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 33, 页码 37506-37514出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c12288
关键词
carbon; N-doping pyrolysis; defects; potassium-ion batteries
资金
- National Natural Science Foundation of China [51972182, 61971252]
- Youth Innovation Team Project of Shandong Provincial Education Department [2020KJN015]
Potassium-ion batteries (KIBs) have aroused enormous interest for future energy storage technology. However, the current anodes for KIBs greatly suffer from the rapid capacity fading and inferior rate capability. Herein, a free-standing flexible anode, that is, nitrogen-doped carbon nanotube paper (NCTP), which is derived from the pyrolysis of organic polypyrrole materials, is demonstrated for high-performance potassium storage. The correlations between the material structure and electrochemical properties have been investigated by a series of material analysis and characterizations, as well as electrochemical tests. The research results show that the annealing temperature dramatically affects the N-doping content, the carbon defects, and the graphitization degree. Electrochemical tests indicate that the NCTP annealed at 700 degrees C displays the best performances with a high reversible capacity of 250.1 mA h g(-1) at 100 mA g(-1) and superior rate capability retaining 133 mA h g(-1) at 5 A g(-1). The excellent electrochemical properties are derived from a synergic contribution from the moderate N-doping, carbon defect, and high electronic conductivity of the materials. The facile pyrolysis strategy and the appealing performances involved in this work could provide some hints to manipulate high-performance anode materials of KIBs.
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