A 3.8-V earth-abundant sodium battery electrode

作者：Barpanda, Prabeer; Oyama, Gosuke; Nishimura, Shin-ichi; Chung, Sai-Cheong; Yamada, Atsuo^*

来源：Nature Communications, 2014, 5(1): 4358.

DOI：10.1038/ncomms5358

• POSITIVE-ELECTRODE
• RECHARGEABLE BATTERIES
• PYROPHOSPHATE CATHODE
• IRON PYROPHOSPHATE
• LITHIUM-DIFFUSION
• ION
• NA
• INTERCALATION
• INSERTION
• FE

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 3.8V (versus Na, and hence 4.1V 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.

• 出版日期2014-7