插层(化学)
电解质
石墨
锂(药物)
剥脱关节
材料科学
阳极
溶剂
电池(电)
无机化学
化学工程
纳米技术
化学
石墨烯
电极
有机化学
医学
工程类
物理
内分泌学
物理化学
功率(物理)
量子力学
作者
Jun Ming,Zhen Cao,Yingqiang Wu,Wandi Wahyudi,Wenxi Wang,Xianrong Guo,Luigi Cavallo,Jang‐Yeon Hwang,Atif Shamim,Lain‐Jong Li,Yang‐Kook Sun,Husam N. Alshareef
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-10-08
卷期号:4 (11): 2613-2622
被引量:207
标识
DOI:10.1021/acsenergylett.9b01441
摘要
Solid electrolyte interphase (SEI)-forming agents such as vinylene carbonate, sulfone, and cyclic sulfate are commonly believed to be film-forming additives in lithium-ion batteries that help to enhance graphite anode stability. However, we find that the film-forming effect and the resultant SEI may not be the only reasons for the enhanced graphite stability. This is because the as-formed SEI cannot inhibit Li+–solvent co-intercalation once the additive is removed from the electrolyte. Instead, we show that the Li+ solvation structure, which is modified by these additives, plays a critical role in achieving reversible Li+ (de)intercalation within graphite. This discovery is confirmed in both carbonate and ether-based electrolytes. We show that the problem of graphite exfoliation caused by Li+–solvent co-intercalation can be mitigated by adding ethene sulfate to tune the Li+ coordination structure. This work brings new insight into the role of additives in electrolytes, expanding the prevailing thinking over the past 2 decades. In addition, this finding can guide the design of more versatile electrolytes for advanced rechargeable metal-ion batteries.
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