Good news!
"Engineers in Australia have created a new carbon-based material which allows supercapacitors to store as much energy as traditional lead-acid batteries and deliver charge much faster.
The new graphene materials are now being made in commercial quantities ..."
"... The secret lies in a new material architecture developed by the team, called multiscale reduced graphene oxide (M-rGO), which is synthesised from natural graphite – an abundant Australian resource.
Using a rapid thermal annealing process, the researchers created a highly curved graphene structure with precise pathways for ions to move quickly and efficiently. The result is a material that offers both high energy density and high power density – a combination rarely achieved in a single device. ..."
From the abstract:
"Supercapacitors deliver high power but are limited in compact applications by low volumetric energy and power densities.
Two-dimensional materials like graphene, despite their high packing density, are hindered by poor ion transport kinetics. A rapid thermal annealing step generates unusually curved turbostratic graphene crystallites, integrated and interwoven within disordered domains in micron-size particles to yield multiscale graphene. Ion insertion into the interlayers enables precise pore-ion matching and partial charge transfer, enabling a high Brunauer-Emmett-Teller surface area-normalized capacitance of 85 µF/cm2.
Here, we show that multiscale graphene exhibits rapid ion transport dynamics within the curved crystallites and disordered domains. When the thin electrodes are assembled into symmetric pouch cell devices, they deliver a stack-level volumetric energy density of 99.5 Wh/L in ionic liquid electrolytes and 49.2 Wh/L in organic electrolyte with a high power density of 69.2 kW/L at 9.6 Wh/L."
Lightning-fast power: breakthrough powers supercapacitors that rival batteries (original news release) "Engineers have made a major leap forward in the global race to build energy storage devices that are both fast and powerful – paving the way for next-generation applications in electrified transport, grid stabilisation and consumer electronics."
Operando interlayer expansion of multiscale curved graphene for volumetrically-efficient supercapacitors (open access)
Fig. 1: Schematic highlighting the differences between lamellar, disordered and multiscale graphene with morphological characterization of M-rGO.
Fig. 2: Physicochemical differences between D-rGO and M-rGO and the fabrication process for the pouch cell prototypes used throughout this study.
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