Issue 34, 2023

ZIF-8 coating on graphite: a high-rate and long-term cycling anode for sodium-ion capacitors

Abstract

Sodium-ion capacitors (SICs) have been designed to combine the advantages of high-energy batteries and high-power capacitors as well as low-cost sodium resources. However, anode materials usually exhibit sluggish diffusion of Na+, which results in kinetics imbalance with the capacitive cathode. Herein, the zeolitic imidazolate framework-8 (ZIF-8) layer is uniformly grown on the graphite surface (ZIF-8@Gr) to promote solvated-Na+ co-intercalation reactions in an ether electrolyte. The ZIF-8 coating can act as a multifunctional protection layer to inhibit electrolyte decomposition in the initial cycle, and also withstand volume expansion of graphite during the long-term co-intercalation process. The initial coulombic efficiency (ICE) of the ZIF-8@Gr electrode can be improved to 86%, much higher than that of the pristine graphite electrode (58%). More importantly, the ZIF-8@Gr electrode possesses ultrafast-charging sodium storage (20 A g−1, a full charge time within 16.2 s) and ultralong cycle life (96% and 94% capacity retention after 15 000 and 20 000 cycles at 5 A g−1 and 10 A g−1, respectively). By coupling the ZIF-8@Gr electrode with the activated carbon (AC) as the positive electrode, the as-fabricated SIC device demonstrates impressive energy//power densities (82 W h kg−1 at 518 W kg−1, 47 W h kg−1 at 10 370 W kg−1). These results indicate that ZIF-based surface modification enables graphite as a fast-charging and long-term cycling sodium-storage material.

Graphical abstract: ZIF-8 coating on graphite: a high-rate and long-term cycling anode for sodium-ion capacitors

Supplementary files

Article information

Article type
Paper
Submitted
08 6 2023
Accepted
24 7 2023
First published
25 7 2023

J. Mater. Chem. A, 2023,11, 18097-18105

ZIF-8 coating on graphite: a high-rate and long-term cycling anode for sodium-ion capacitors

X. Liang, Z. Mao, X. Shi, T. Zhang, Z. Zheng, J. Jin, B. He, R. Wang, Y. Gong and H. Wang, J. Mater. Chem. A, 2023, 11, 18097 DOI: 10.1039/D3TA03404F

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