阳极
法拉第效率
钠
溶剂化
离子
材料科学
化学工程
电解质
无机化学
化学
电化学
锂(药物)
电极
冶金
工程类
内分泌学
医学
物理化学
有机化学
作者
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
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-04-22
卷期号:20 (5): 3247-3254
被引量:80
标识
DOI:10.1021/acs.nanolett.9b05355
摘要
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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