电解质
二甲氧基乙烷
乙醚
化学
锂(药物)
阳极
无机化学
二甲醚
螯合作用
溶剂化
溶剂
有机化学
电极
物理化学
甲醇
内分泌学
医学
作者
Lan-Qing Wu,Zhe Li,Yong Lu,Jin-Ze Hou,Hao-Qin Han,Qing Zhao,Jun Chen
标识
DOI:10.1002/cssc.202300590
摘要
Ether-based electrolytes that are endowed with decent compatibility towards lithium anode have been regarded as promising candidates for constructing energy-dense lithium metal batteries (LMBs) but their applications are hindered by the low oxidation stability in conventional salt concentration. Here, we reported that regulating the chelating power and coordination structure can remarkably increase the high-voltage stability of ether-based electrolytes and lifespan of LMBs. Two ether molecules of 1,3-dimethoxypropane (DMP) and 1,3-diethoxypropane (DEP) are designed and synthesized as solvents of electrolytes to replace the traditional ether solvent (1,2-dimethoxyethane, DME). Both computational and spectra reveal that the transition from five- to six-membered chelate solvation structure by adding one methylene on DME results in the formation of weak Li solvates, which increase the reversibility and high-voltage stability in LMBs. Even under lean electrolyte (5 mL Ah-1) and low anode to cathode ratio (2.6), the fabricated high-voltage Li||LiNi0.8Co0.1Mn0.1O2 LMBs using electrolyte of 2.30 M lithiumbisfluorosulfonimide (LiFSI)/DMP still show capacity retention over 90% after 184 cycles. This work highlights the importance of designing the coordination structures in non-fluorine ether electrolytes for rechargeable batteries.
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