A 3.8-V earth-abundant sodium battery electrode
By P. Barpanda, Gosuke Oyama, Shin-ichi Nishimura, Sai-Cheong Chung, Atsuo Yamada. Nature Communications, 2014
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Rechargeable lithium batteries have ushered the wireless revolution over last two decades and are now matured to enable green automobiles. However, the growing concern on scarcity and large-scale applications of lithium resources have steered effort to realize sustainable sodium-ion batteries, Na and Fe being abundant and low-cost charge carrier and redox centre, respectively. However, their performance is limited owing to low operating voltage and sluggish kinetics. Here we report a hitherto-unknown material with entirely new composition and structure with the first alluaudite-type sulphate framework, Na2Fe2(SO4)3, registering the highest-ever Fe3+/Fe2+ redox potential at 3.8 V (versus Na, and hence 4.1 V versus Li) along with fast rate kinetics. Rare-metal-free Na-ion rechargeable battery system compatible with the present Li-ion battery is now in realistic scope without sacrificing high energy density and high power, and paves way for discovery of new earth-abundant sustainable cathodes for large-scale batteries. Cathode materials for sodium-ion batteries often suffer from low operating voltage, sluggish kinetics and high cost. Here, the authors report an iron-based alluaudite-type sulphate cathode, which could achieve a high redox potential of 3.8 V versus sodium, high energy density and fast rate kinetics.
Subfields: Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/67a74588b4d8d6736f0af6972deab09c69d87af3
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