Large‐Area Carbon Nanosheets Doped with Phosphorus: A High‐Performance Anode Material for Sodium‐Ion Batteries

Abstract

Large‐area phosphorus‐doped carbon nanosheets (P‐CNSs) are first obtained from carbon dots (CDs) through self‐assembly driving from thermal treatment with Na catalysis. This is the first time to realize the conversion from 0D CDs to 2D nanosheets doped with phosphorus. The sodium storage behavior of phosphorus‐doped carbon material is also investigated for the first time. As anode material for sodium‐ion batteries (SIBs), P‐CNSs exhibit superb performances for electrochemical storage of sodium. When cycled at 0.1 A g−1, the P‐CNSs electrode delivers a high reversible capacity of 328 mAh g−1, even at a high current density of 20 A g−1, a considerable capacity of 108 mAh g−1 can still be maintained. Besides, this material also shows excellent cycling stability, at a current density of 5 A g−1, the reversible capacity can still reach 149 mAh g−1 after 5000 cycles. This work will provide significant value for the development of both carbon materials and SIBs anode materials.

Effect of Hot Pressing on the Electrochemical Performance of Multilayer Holey Graphene Materials in Li‐ion Batteries

“…That demonstrates that an increased interlayer distance has a positive effect on the capacity at current densities above 2 A g −1 . Indeed, it has been shown that the enlarged distance between the graphene layers shortens the diffusion length for metal ions . A discharge‐charge cycling of the sample HG600a at high current densities resulted in an increase of the capacity when the measurements were repeated at 2 A g −1 .…”

Graphene‐wrapped poly(2,5‐dihydroxy‐1,4‐benzoquinone‐3,6‐methylene) nanoflowers as low‐cost and high‐performance cathode materials for sodium‐ion batteries

“…However, the scarcity and uneven distribution of lithium resources limit the wide application of LIBs in large‐scale energy storage market . Sodium, which is chemically similar in many properties and abundantly distributed in the crust, is an alternative for lithium . Therefore, the energy storage system of sodium‐ion batteries (SIBs) has obvious advantages in resources and cost, and has great potential in the future.…”

Natural Okra Shells Derived Nitrogen‐Doped Porous Carbon to Regulate Polysulfides for High‐Performance Lithium–Sulfur Batteries

“…These limitations motivated the researchers to explore alternative carbon materials that are highly abundant of low cost and efficient without creating any environmental pollution. To date, biomass activated carbon, due to the developed pores, large specific surface area, abundant raw materials, good electrical conductivity, and mechanical properties, is widely used as electrode materials in electrochemical energy devices, which is derived from natural animals and plants, such as egg shell, cotton, peanut coat, seaweed, rice, Aspergillus oryzae , and so on …”