Atomic Layer Coated Al₂O₃ on Nitrogen Doped Vertical Graphene Nanosheets for High Performance Sodium Ion Batteries

Abstract

Heteroatom doped graphene materials are considered as promising anode for high‐performance sodium‐ion batteries (SIBs). Defective and porous structure especially with large specific surface area is generally considered as a feasible strategy to boost reaction kinetics; however, the unwanted side reaction at the anode hinders the practical application of SIBs. In this work, a precisely controlled Al2O3 coated nitrogen doped vertical graphene nanosheets (NVG) anode material has been proposed, which exhibits excellent sodium storage capacity and cycling stability. The ultrathin Al2O3 coating on the NVG is considered to help construct an advantageous interface between electrode and electrolyte, both alleviating the electrolyte decomposition and enhancing sodium adsorption ability. As a result, the optimal Al2O3 coated NVG materials delivers a high reversible capacity (835.0 mAh g−1) and superior cycling stability (retention of 92.3% after 5000 cycles). This work demonstrates a new way to design graphene‐based anode materials for high‐performance sodium‐ion batteries.

A flexible metallic TiC nanofiber/vertical graphene 1D/2D heterostructured as active electrocatalyst for advanced Li–S batteries

“…A way forward lies in significant enlargement in the specific interfacial area with electrocatalysts, so that Li 2 S could be spread over a large surface to reduce overall film thickness and avoid local aggregation. Conducting two‐dimensional (2D) materials such as low‐defect graphene would be an additive material of choice, so that its effective coupling with nanoelectrocatalysts could enable the best use of the surficial area of the catalysts while providing an electric highway for charge and ion transportation 17,46–50 …”

Complex permittivity‐dependent plasma confinement‐assisted growth of asymmetric vertical graphene nanofiber membrane for high‐performance Li‐S full cells

“…In our HPECVD system, 59 charged particles, energetic electrons, and ions in the plasma are confined by the magnetic fields lines generated from two static magnetic coils, which could form a long‐range and stable high‐flux plasma propagation throughout the chamber. High flux electrons and ion density of such long‐range stable plasma are the key parameters for the sequential formation of carbon materials.…”

Defect-type AlOxnanointerface boosting layered Mn-based oxide cathode for wide-temperature sodium-ion battery

“…on the surface of P2-type oxides. 35–41 However, this conventional method cannot be applied to the surface modification of O3-type layered oxides, because of their high sensitivity to the ambient atmosphere. In recent years, a small number of reports have investigated coating O3-phase oxides using other modified strategies.…”