Enhanced Potassium-Ion Storage of the 3D Carbon Superstructure by Manipulating the Nitrogen-Doped Species and Morphology

Abstract Potassium-ion batteries (PIBs) are attractive for grid-scale energy storage due to the abundant potassium resource and high energy density. The key to achieving high-performance and large-scale energy storage technology lies in seeking eco-efficient synthetic processes to the design of suitable anode materials. Herein, a spherical sponge-like carbon superstructure (NCS) assembled by 2D nanosheets is rationally and efficiently designed for K + storage. The optimized NCS electrode exhibits an outstanding rate capability, high reversible specific capacity (250 mAh g −1 at 200 mA g −1 after 300 cycles), and promising cycling performance (205 mAh g −1 at 1000 mA g −1 after 2000 cycles). The superior…

• NN
  National Natural Science Foundation of China

  Awards: 51772086, 51572078, 51872087, 11605053
• NS
  Natural Science Foundation of Hunan Province

  Awards: 2018JJ2038, 2017JJ3052