Journal
ENERGY STORAGE MATERIALS
Volume 25, Issue -, Pages 324-333Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2019.10.006
Keywords
Hard carbon anode; Na-ion battery; Solvation; Solid electrolyte interphase; Electrolyte additive
Funding
- National Natural Science Foundation of China [51672188]
- Natural Science Foundation of Tianjin City [16JCYBJC40900]
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Electrolytes and interfacial chemistry with controllable properties are critical to improve the cycling stability and rate capability of hard carbons in sodium-ion batteries. Here a simple but effective strategy was developed to construct a sustainable solid electrolyte interphase (SEI) film on hard carbon anodes by introducing a small amount of ester additives as SEI film formation agents into an ether-based electrolyte. The involvement of the ester molecule into the sodium ion solvation structure promotes its reduction to produce more organic polymeric components. Combining the high ionic conductivity of ether-based electrolytes, such SEI film can effectively protect hard carbon electrodes from structural changes, and thus, demonstrating an extraordinary cycling performance with a remarkable capacity of 211 mAh g(-1) after 2000 cycles at a high rate of 1 A g(-1), corresponding to a quite high capacity retention of 95.6%. The scalable leverage developed in this work highlights the promise of electrolyte screening and interfacial composition control for more efficient battery chemistries.
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