Highly Ordered Graphene Solid: An Efficient Platform for Capacitive Sodium-Ion Storage with Ultrahigh Volumetric Capacity and Superior Rate Capability.
basic_science · Level V
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- Record sourced from PubMed, PMID 31314490.
- Also identified by DOI 10.1021/acsnano.9b03492.
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Abstract
As an emerging type of electrochemical energy storage devices, sodium-ion capacitors (SICs) are potentially capable of high energy density and high power density, as well as low cost and long lifespan. Unfortunately, the lack of high-performance capacitive cathodes that can fully couple with the well-developed battery-type anodes severely restricts the further development of SICs. Here, we develop a compact yet highly ordered graphene solid (HOGS), which combines the merits of high density and high porosity and, more attractively, possesses a highly ordered lamellar texture with low pore tortuosity. As the capacitive cathode of SICs, HOGS delivers a record-high volumetric capacity (303 F cm<sup>-3</sup> or 219 mA h cm<sup>-3</sup> at 0.05 A g<sup>-1</sup>), a superior rate capability (185 F cm<sup>-3</sup> or 139 mA h cm<sup>-3</sup> even at 10 A g<sup>-1</sup>), and an outstanding cycling stability (over 80% after 10 000 cycles). The material design and construction strategies reported here can be easily extended to other metal-ion-based energy storage technologies, exhibiting universal potentials in compact electrochemical energy storage systems.