Ultra-fast and ultra-long-life Li ion batteries with 3D surface-porous graphene anodes synthesized from CO2

Document Type

Article

Publication Date

7-14-2020

Department

Department of Materials Science and Engineering

Abstract

The Li-ion batteries (LIBs) with ultra-fast charge/discharge behavior and long-term cyclic performance are highly desirable for many applications. Herein, the three-dimensional graphene (3DG) with rich surface-pores, which was synthesized directly from Na-reduction of CO2, was demonstrated as an efficient anode for LIBs. The 3DG anode exhibited a very high discharge capacity of 972 mA h g-1 at 0.2C and an outstanding reversible capacity of 277 mA h g-1 at an extremely high current density of 150C (55.8 A g-1). Furthermore, a discharge capacity of 280 mA h g-1 was obtained after 10 000 cycles at 50C, reaching a high capacity retention of 91.9%. Such an excellent electrochemical performance was attributed to the large specific surface area of 3DG and its rich surface-micropores as well as its numerous oxygen-induced defects. This provides a new door to develop highly efficient electrodes from a greenhouse gas for long-life and ultrafast-charging LIBs.

Publisher's Statement

© The Royal Society of Chemistry. Publisher’s version of record: https://doi.org/10.1039/d0ta03606d

Publication Title

Journal of Materials Chemistry A

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