Smoothing the Sodium-Metal Anode with a Self-Regulating Alloy Interface for High-Energy and Sustainable Sodium-Metal Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 34432922.
- Also identified by DOI 10.1002/adma.202102802.
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Abstract
Because of the large abundance of sodium (Na) as a source material and the easy fabrication of Na-containing compounds, the sodium (Na) battery is a more environmentally friendly and sustainable technology than the lithium-ion battery (LIB). Na-metal batteries (SMBs) are considered promising to realize a high energy density to overtake the cost effectiveness of LIBs, which is critically important in large-scale applications such as grid energy storage. However, the cycling stability of the Na-metal anode faces significant challenges particularly under high cycling capacities, due to the complex failure models caused by the formation of Na dendrites. Here, a universal surface strategy, based on a self-regulating alloy interface of the current collector, to inhibit the formation of Na dendrites is reported. High-capacity (10 mAh cm<sup>-2</sup> ) Na-metal anodes can achieve stable cycling for over 1000 h with a low overpotential of 35 mV. When paired with a high-capacity Na<sub>3</sub> V<sub>2</sub> (PO<sub>4</sub> )<sub>2</sub> F<sub>3</sub> cathode (7 mAh cm<sup>-2</sup> ), the SMB delivers an unprecedented energy density (calculated based on all the cell components) over 200 Wh kg<sup>-1</sup> with flooded electrolyte, or over 230 Wh kg<sup>-1</sup> with lean electrolyte. The dendrite-free SMB also shows high cycling stability with a capacity retention per cycle over 99.9% and an ultrahigh energy efficiency of 95.8%.