期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202103522
关键词
fluoride-rich interfaces; high safety; nonflammable electrolytes; non-solvating solvents; sodium metal batteries
类别
资金
- National Natural Science Foundation of China [21975186]
- Shanghai Rising-Star Program [19QA1409300]
By introducing fluorinated solvents, a sodium metal battery electrolyte with flame-retardant properties and good cycling performance has been successfully designed, effectively addressing the challenges in safety and cycling stability.
Sodium metal batteries (SMBs) are promising for large scale energy storage due to the remarkable capacity of sodium metal anode (SMA) and the natural abundance of Na-containing resources. However, multiple challenges exist with regards to the usage of SMBs, including dendritic Na growth, poor cyclability of SMA, and severe safety hazards stemming from the employment of the highly flammable liquid electrolytes. Herein, by introducing two functional fluorinated solvents, 1,1,2,2-tetra-fluoroethyl 2,2,3,3-tetrafluoropropyl ether (HFE) and fluoroethylene carbonate (FEC) into trimethyl phosphate (TMP)-based electrolyte, a SMA-compatible flame-retardant electrolyte is enabled, in which Na/Na symmetrical cells can cycle for 800 h at 1.0 mA cm(-2) or 3.0 mAh cm(-2). Specifically, the non-solvating HFE plays a critical role in increasing the local electrolyte concentration and reducing the unfavorable decomposition of TMP molecules. By introducing FEC as the co-solvent simultaneously, its preferential defluorination induces a fluoride-rich solid-electrolyte interphase that prevents Na metal surface against the continuous parasitic reactions. More importantly, the designed electrolyte is endowed with an intrinsic non-flammability, which manifests a prerequisite for the real-life application of SMBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据