N-Doped Carbon Nanonecklaces as a Potassium-Ion Battery Anode

作者：Yan Gu, Ya Ru Pei, Ming Zhao, Guoyong Wang, Chun Cheng Yang, Qing Jiang · 发表于：ACS Applied Nano Materials · 年份：2023 · DOI：10.1021/acsanm.3c03695 · 被引用次数：12 · 研究领域：Advancements in Battery Materials、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

Potassium-ion batteries (PIBs) have gained tremendous attention to compete with lithium-ion batteries (LIBs), especially for storing energy on a large scale, due to their dominance in the geographical distribution of K resources and similar energy storage mechanisms. Herein, using an electrospinning method, we synthesized a unique material of carbon nanonecklaces with a high content of N-doping (N-CNN). The N-CNN-700 anode (N-CNN annealed at 700 °C) shows outstanding durability in PIBs, delivering 173 mAh g –1 after 1000 cycles at 1 A g –1 . The unique characteristics of ultrahigh pyrrolic/pyridinic-N doping and hollow necklace-like structures account for excellent performance, which can enable fast electrolyte diffusion, increase active sites for K + insertion, and enhance K + adsorption ability. This object demonstrates a clever strategy to design a structure for improved energy storage technologies.