Stable Sodium Metal Anode Enabled by an Interface Protection Layer Rich in Organic Sulfide Salt

• DOI: 10.1021/acs.nanolett.0c04158
• Publication Date: 2020-12-10T23:50:12Z
• Authors: Ming Zhu; Yuanjun Zhang; Fangfang Yu; Zhongyi Huang; Ying Zhang; Lulu Li; Guanyao Wang; Liaoyong Wen; Hua Kun Liu; Shi-Xue Dou; Chao Wu
• Keywords: Organosulfur compounds; Prussian blue; Propylene carbonate

Sodium (Na) metal is considered as a promising anode candidate for large-scale energy storage systems because of its high theoretical capacity and low electrochemical redox potential. However, Na suffers from few challenges, such the dendrite growth severe parasitic reactions with electrolytes, which greatly hinder practical applications. In this work, we demonstrate that an organosulfur compound additive (tetramethylthiuram disulfide) provides facile approach to overcome above challenges in carbonate-based electrolytes. This unique can situ form stable interfacial protection layer rich organic sulfide salts on sodium surface during cycling, leading stripping/plating cycling. Additionally, cycling Coulombic efficiency 94.25% achieved, full battery using Prussian Blue cathode delivers reversible 86.2 mAh g–1 retention 80% after 600 cycles at 4 C.