材料科学
阳极
碳酸乙烯酯
电解质
电极
合金
碳酸丙烯酯
阴极
化学工程
钠
金属
电化学
复合数
无机化学
化学
冶金
复合材料
物理化学
工程类
作者
Hui Wang,Yan Wu,Ye Wang,Tingting Xu,Dezhi Kong,Yang Jiang,Di Wu,Yongbing Tang,Xinjian Li,Chun‐Sing Lee
标识
DOI:10.1007/s40820-021-00756-7
摘要
In conventional ethylene carbonate (EC)/propylene carbonate (PC) electrolyte, sodium metal reacts spontaneously and deleteriously with solvent molecules. This significantly limits the practical feasibility of high-voltage sodium metal batteries based on Na metal chemistry. Herein, we present a sodium metal alloy strategy via introducing NaIn and Na2In phases in a Na/In/C composite, aiming at boosting Na ion deposition stability in the common EC/PC electrolyte. Symmetric cells with Na/In/C electrodes achieve an impressive long-term cycling capability at 1 mA cm-2 (> 870 h) and 5 mA cm-2 (> 560 h), respectively, with a capacity of 1 mAh cm-2. In situ optical microscopy clearly unravels a stable Na ion dynamic deposition process on the Na/In/C composite electrode surface, attributing to a dendrite-free and smooth morphology. Furthermore, theoretical simulations reveal intrinsic mechanism for the reversible Na ion deposition behavior with the composite Na/In/C electrode. Upon pairing with a high-voltage NaVPOF cathode, Na/In/C anode illustrates a better suitability in SMBs. This work promises an alternative alloying strategy for enhancing Na metal interfacial stability in the common EC/PC electrolyte for their future applications.
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