Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 12, Issue 5, Pages 1605-1612Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ee00536f
Keywords
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Funding
- National Key R&D Research Program of China [2016YFB0100201]
- Beijing Natural Science Foundation [JQ18005]
- National Natural Science Foundation of China (NSFC) [51671003, 21802003]
- China Postdoctoral Science Foundation [2018M631239]
- Peking University
- Young Thousand Talented Program
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Potassium-ion batteries (PIBs) have drawn much attention as a replacement for lithium-ion batteries (LIBs) owing to their low cost and high safety. However, it is still an open challenge to design stable and high-capacity nanocarbon for efficient intercalation/deintercalation of large K ions. Herein, we report a class of ultra-high pyrrolic/pyridinic-N-doped necklace-like hollow carbon (NHC) material as a novel free-standing anode for enhancing PIBs in terms of their capacity, rate ability and durability. The as-made NHC film features abundant hierarchical micro/meso/macro-pores, a necklace-like hollow structure, ultra-high pyrrolic/pyridinic-N doping and a high specific surface area, which could finally promote the intercalation/deintercalation of K ions, reduce the volume expansion and improve the stability of PIBs. These new characteristics allow the NHC to deliver a high reversible specific capacity of 293.5 mA h g(-1) at 100 mA g(-1), outstanding rate property (204.8 mA h g(-1) at 2000 mA g(-1)) and cycling performance (161.3 mA h g(-1) at 1000 mA g(-1) after 1600 cycles), which represent the best performance for carbon-based non-metal materials for PIB anode. Density functional theory (DFT) calculations demonstrate that pyrrolic and pyridinic-N doping can efficiently change the charge density distribution of carbon and promote the adsorption of K+ on the NHC electrode, which promotes K ion storage.
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