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Identifying Ion Accessibility with Ether-Based Electrolytes to Approach Superior Rate Performance of Sulfur-Doped Carbon Anodes for Sodium-Ion Batteries
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DOI：10.1021/acsami.6c03563.png)
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Abstract
En 中文
Ether-based electrolytes have been recognized as desirable candidates for enhancing the electrochemical performance of sodium-ion batteries. However, the ion-storage electrochemistry in ether-based electrolytes remains poorly understood for promising amorphous carbon anodes. Herein, by coupling the sulfur-doped soft carbon anodes with three different ether-based electrolytes, the electrolyte-dependent electrochemical behavior is revealed, showing that the accessibility of sodium-ion diffusion from electrode interfaces to internal hosts is greatly enhanced in monoglyme-based electrolytes. It enables a superior rate capability than those with diglyme- and tetraglyme-based electrolytes, delivering specific capacities of 590 and 196 mAh g–1 at 0.1 and 10 A g–1, respectively. This work demonstrates that carbon layers and sulfur dopants in the bulk phase of sulfur-doped carbon anodes are efficiently activated with a suitable cointercalation process of small, weakly solvated Na+ for sodium-ion storage. It provides an insight into the role of ether-based electrolytes in ion-storage dynamics optimization of carbon materials for sodium-ion batteries.
Keywords:
ion accessibility
ether-based electrolytes
sodium-ion batteries
sulfur-doped soft carbon
anode
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