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Published on: September 12, 2018
In situ Microscopic Observation of Sodium Deposition/Dissolution on Sodium Electrode
Yuhki Yui1,2, Masahiko Hayashi1, Jiro Nakamura1,2
1NTT Device Technology Labs., NTT Corporation 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa Pref. 243-0198, Japan.
Abstract:
Electrochemical sodium deposition/dissolution behaviors in propylene carbonate-based electrolyte solution were observed by means of in situ light microscopy. First, granular sodium was deposited at pits in a sodium electrode in the cathodic process. Then, the sodium particles grew linearly from the electrode surface, becoming needle-like in shape. In the subsequent anodic process, the sodium dissolved near the base of the needles on the sodium electrode and the so-called "dead sodium" broke away from the electrode. The mechanisms of electrochemical sodium deposition and dissolution on a copper electrode were similar to those on the sodium electrode.
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