In Situ Grown S Nanosheets on Cu Foam: An Ultrahigh Electroactive Cathode for Room-Temperature Na–S Batteries

Abstract

Room-temperature sodium-sulfur batteries are competitive candidates for large-scale stationary energy storage because of their low price and high theoretical capacity. Herein, pure S nanosheet cathodes can be grown in situ on three-dimensional Cu foam substrate with the condensation between binary polymeric binders, serving as a model system to investigate the formation and electrochemical mechanism of unique S nanosheets on the Cu current collectors. On the basis of the confirmed conversion reactions to NaS, The constructed cathode exhibits ultrahigh initial discharge/charge capacity of 3189/1403 mAh g. These results suggest that there is great potential to optimize S cathode by exploiting low-cost Cu substrates instead of conventional Al current collectors.

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

“…[37] Zhang et al used nanocellulose to successfully improve the film forming property of polyaniline (PANI) and as-prepared nanocellulose-based PANI composites film with core-shell structure showed high contrast ratio and coloration efficiency in ECDs. [38] These pioneer works inspire us to construct uniform CNCs/viologen composite films and make use of them to design a novel viologen-based ECDs. To the best of our knowledge, this is the first time to report the preparation of CNCs/viologen composite-based ECDs with an organic solvent-free process.…”

Design and Construction of Sodium Polysulfides Defense System for Room‐Temperature Na–S Battery

“…[1][2][3] Recently, room-temperature Na-S batteries have attracted much attention because of their high theoretical specific capacity (1675 mAh g −1 ) and energy density (1274 Wh kg −1 ) as well as abundant Na and S resources in the Earth's crust. [10] Finally, sodium polysulfides generated in the multistep reaction have high reactivity and solubility and are easy to diffuse to the sodium anode, resulting in serious "shuttle effect" that leads to a significant reduction in capacity. [8,9] Second, Na-S batteries have a higher volume expansion than lithium-sulfur batteries (LSBs), which makes the cathode structure of Na-S batteries prone to collapse.…”

Sulfur‐Based Electrodes that Function via Multielectron Reactions for Room‐Temperature Sodium‐Ion Storage

“…As illustrated in Figure f, Zhang et al. also confirmed the polar–polar interactions between Cu foam and S . The Cu foam is polarized with the formation of CuS and Cu 2 S during preparation of the S electrode.…”

“…The Cu foam is polarized with the formation of CuS and Cu 2 S during preparation of the S electrode. The polarized Cu foam showed high sulfur affinity and was expected to immobilize the produced polysulfide, leading to reduced shuttle phenomenon . Recently, this research group also reported on a new S host consisting of ≈10 wt % transition metal (M=Fe, Cu, and Ni) nanoclusters deposited on hollow carbon nanospheres.…”