AI Article Synopsis
- Sodium batteries are gaining attention due to their cost-effectiveness and abundant materials.
- The feasibility of studying Na metal anodes using in situ NMR is explored, revealing a high surface area morphology of Na deposits.
- The study identifies two behavior patterns during electrochemical cycling: at low currents, deposits can be partially removed during current reversal, while at high currents, deposit removal is minimal and leads to increased accumulation over time.
Article Abstract
Sodium batteries have seen a resurgence of interest from researchers in recent years, owing to numerous favorable properties including cost and abundance. Here we examine the feasibility of studying this battery chemistry with in situ NMR, focusing on Na metal anodes. Quantification of the NMR signal indicates that Na metal deposits with a morphology associated with an extremely high surface area, the deposits continually accumulating, even in the case of galvanostatic cycling. Two regimes for the electrochemical cycling of Na metal are apparent that have implications for the use of Na anodes: at low currents, the Na deposits are partially removed on reversing the current, while at high currents, there is essentially no removal of the deposits in the initial stages. At longer times, high currents show a significantly greater accumulation of deposits during cycling, again indicating a much lower efficiency of removal of these structures when the current is reversed.
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| http://dx.doi.org/10.1021/jacs.5b12423 | DOI Listing |
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