期刊
NANO LETTERS
卷 20, 期 5, 页码 3247-3254出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b05355
关键词
sodium battery; electrolyte; solid electrolyte interphase; anode; fast charging
类别
资金
- National Natural Science Foundation of China [21978281, 21975250]
- National Key RAMP
- D Program of China [SQ2017YFE9128100]
- Independent Research Project of the State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [110005R086]
- King Abdullah University of Science and Technology (KAUST)
- Hanyang University
Sodium-ion batteries are promising alternatives for lithium-ion batteries due to their lower cost caused by global sodium availability. However, the low Coulombic efficiency (CE) of the sodium metal plating/stripping process represents a serious issue for the Na anode, which hinders achieving a higher energy density. Herein, we report that the Na+ solvation structure, particularly the type and location of the anions, plays a critical role in determining the Na anode performance. We show that the low CE results from anion-mediated corrosion, which can be tackled readily through tuning the anion interaction at the electrolyte/anode interface. Our strategy thus enables fast-charging Na-ion and Na-S batteries with a remarkable cycle life. The presented insights differ from the prevailing interpretation that the failure mechanism mostly results from sodium dendrite growth and/or solid electrolyte interphase formation. Our anionic model introduces a new guideline for improving the electrolytes for metal-ion batteries with a greater energy density.
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