Nitrogen‐Doped Carbon Nanotubes Derived from Metal–Organic Frameworks for Potassium‐Ion Battery Anodes

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Abstract
To tackle the issue of the poor rate capability of graphite anodes for potassium‐ion batteries (KIBs), nitrogen‐doped carbon nanotubes (NCNTs) with an edge‐open layer‐alignment structure were synthesized using a simple and scalable approach of pyrolyzing cobalt‐containing metal–organic frameworks. The unique structure enables a facile and fast intercalation of K ions. As anodes of KIBs, the NCNTs demonstrated an improved rate capability by a high capacity retention of 102 mA h g−1 at a high current density of 2000 mA g−1 and a good stability without evident capacity loss over 500 cycles at 2000 mA g−1. Our findings can help to develop highperformance anode materials for potassium‐ion batteries as large‐scale and low‐cost energy‐storage systems.
Funding Information
  • National Natural Science Foundation of China (51672188)
  • Natural Science Foundation of Tianjin Municipality (16JCYBJC40900)

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