Engineering Sodium-Ion Solvation Structure to Stabilize Sodium Anodes: Universal Strategy for Fast-Charging and Safer Sodium-Ion Batteries

Lin Zhou, Zhen Cao, Jiao Zhang, Qujiang Sun, Yingqiang Wu, Wandi Wahyudi, Jang-Yeon Hwang, Limin Wang, Luigi Cavallo, Yang-Kook Sun, Husam N. Alshareef, Jun Ming

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40 Scopus citations


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.
Original languageEnglish (US)
Pages (from-to)3247-3254
Number of pages8
JournalNano Letters
Issue number5
StatePublished - Apr 22 2020

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