Title

A nanoarchitectured Na6Fe5(SO4)8/CNTs cathodefor building a low-cost 3.6 V sodium-ion full batterywith superior sodium storage

RIS ID

136666

Publication Details

Liu, S., Song, X., Kuai, X., Zhu, W., Tian, K., Li, X., Chen, M., Chou, S., Zhao, J. & Gao, L. (2019). A nanoarchitectured Na6Fe5(SO4)8/CNTs cathodefor building a low-cost 3.6 V sodium-ion full batterywith superior sodium storage. Journal of Materials Chemistry A, 7 (24), 14656-14669.

Abstract

A high-voltage sodium-ion full battery has been assembled based on Na6Fe5(SO4)8 sulfate structurally integrated with 5 wt% carbon nanotubes (NFS@5%CNTs) acting as the cathode material, with commercialized hard carbon (HC) as the anode material. This full NFS@5%CNTs//HC cell delivers a practical working voltage of 3.6 V and an impressive energy density approaching 350 W h kg-1, and it can retain a specific capacity of 61.8 mA h g-1 after 1000 cycles at 2C. The superior sodium storage performance of this example of a full battery is attributed to the Na6Fe5(SO4)8 cathode material, which is structurally integrated with a conductive CNT component. The CNT additive is tightly implanted and runs through the whole NFS bulk, improving the electrochemical performance of NFS@x%CNTs cathode materials during the reversible intercalation/deintercalation of sodium ions. The optimized CNT content for NFS@x%CNTs cathode materials is evaluated to be 5 wt%, resulting in high initial capacities of 110.2 and 86.4 mA h g-1 at 0.1 and 2C, respectively. This work introduces a new derivative of sodium iron sulfates to act as a high-energy cathode material for sodium ion batteries, together with offering an effective CNT-assisted method for enhancing electrochemical performance. A full sodium-ion battery is further developed with a high working voltage and high energy/power densities for practical large-scale applications.

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Link to publisher version (DOI)

http://dx.doi.org/10.1039/c9ta03089a