Zhixin Xu, Xiyue Zhang, Jun Yang, Xuzixu Cui, Yanna Nuli, Jiulin Wang
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引用次数: 0
Abstract
Current electrolytes of mixing different functional solvents inherit both merits and weaknesses of each solvent, thus cannot simultaneously meet all the requirements of high energy, long cycle life, and high safety for Li metal batteries (LMBs). Here, we design a high voltage and safe electrolyte (VSE) by integrating different functional groups into one molecule. The VSE electrolyte has a wide electrochemical stability window of ~5.6 V enabling a Li anode to achieve high Coulombic efficiency of >99.3%, Li | |LiNi0.8Co0.1Mn0.1O2 coin cell to maintain capacity retention of 92% after 500 cycles, and the 3.5-Ah-grade Li | |LiNi0.8Co0.1Mn0.1O2 pouch cell to deliver a high energy density of 531 Wh kg−1 without any flame and expansion after cycled under extreme conditions. The VSE electrolyte even enables 5.0 V Li | |LiNi0.5Mn1.5O4 cells to charge/discharge for 200 cycles without capacity decay. This work provides a promising direction for the rational design of high-voltage and intrinsically safe electrolytes for LMBs.
期刊介绍：
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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