电解质
材料科学
阳极
化学工程
枝晶(数学)
金属
聚合物
图层(电子)
电极
复合材料
化学
冶金
物理化学
工程类
几何学
数学
作者
Zewen Liu,Qi Zhang,Xi‐Ming Song,Yangyan Shi,Xiaojian Zhu,Xiao Liu,Yamei Zhou,Zhonghui Chen,Feng Ye,Silei Chen,Jinling He,Zhiwei Guo,Yong Zhao
出处
期刊:Small
[Wiley]
日期:2024-02-07
标识
DOI:10.1002/smll.202312150
摘要
Metal electrode with long cycle life is decisive for the actual use of metal rechargeable batteries, while the dendrite growth and side reaction limit their cyclic stability. Herein, the construction of polymer and inorganic-rich SEI tandem layer structure on Li metal can be used for extraordinarily extending its cycle life is reported, which is generated by an in situ PVDF/LiF/LiNO3 (PLL) gel layer on the surface of Li metal with a chemically compatible ether solvent. The cycle life of Li//Li cells with the tandem layer structure is over 6000 h, six times longer than those with LiNO3 homogeneous electrolyte. It highlights the importance of LiNO3 concentration gradient electrolyte formed by the in situ PLL gel layer, in which highly concentrated LiNO3 is confined on the surface of Li metal to generate the uniform and inorganic-rich LiF/Li2 O/Li3 N layer on the bottom of PVDF/LiF with good mechanical strength, resulting in the dendrite free anode in cell cycling. The assembled Li//LiFePO4 and Li//NMC811 batteries show the capacity retention rate of 80.9% after 800 cycles and 82.3% after 500 cycles, respectively, much higher than those of references.
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