Issue 19, 2020

Full pseudocapacitive behavior hypoxic graphene for ultrafast and ultrastable sodium storage

Abstract

Achieving fast-charging/discharging (FCD) performance for sodium-ion batteries (SIBs) has always been a great challenge, because of their slow reaction kinetics and the difficulty in ensuring the stability of the electrode during sodiation/desodiation. In this study, a hypoxic graphene (HG) is rationally designed and prepared using a simple high temperature treatment process. It is confirmed that the hypoxic surface is more conducive to the rapid conduction of electrons and forming a high quality SEI film in the first cycle to avoid irreversible side reactions. Furthermore, a versatile electrolyte suitable for improving the FCD performance of different carbon materials is screened and used in this system. As a result, the best sample of HG-1300 shows almost full pseudocapacitive behavior as an anode material for SIBs, and exhibits a super FCD performance (110 mA h g−1 at an ultrahigh current density of 200 A g−1, only 4 seconds per cycle) and ultralong lifespan (90.7% capacity retention over 100 000 cycles at 20 A g−1), even surpassing supercapacitors.

Graphical abstract: Full pseudocapacitive behavior hypoxic graphene for ultrafast and ultrastable sodium storage

Supplementary files

Article information

Article type
Paper
Submitted
20 Mar 2020
Accepted
25 Apr 2020
First published
27 Apr 2020

J. Mater. Chem. A, 2020,8, 9911-9918

Full pseudocapacitive behavior hypoxic graphene for ultrafast and ultrastable sodium storage

Y. Wang, B. Hou, X. Yang, D. Chen, H. Liang, Z. Gu, X. Rui and X. Wu, J. Mater. Chem. A, 2020, 8, 9911 DOI: 10.1039/D0TA03181J

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