期刊
NANO ENERGY
卷 103, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107829
关键词
Silicon anodes; Transport kinetics; Polyurea interface; Lithium ion batteries
类别
资金
- Natural Science Foundation of China [51634003]
- China Postdoctoral Science Foundation [2022M710951, 2022TQ0087]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chair Program (CRC)
- Canada Foundation for Innovation (CFI)
- China Scholarship Council (CSC)
This study successfully establishes a stable artificial SEI on silicon anodes using molecular layer deposition, greatly improving the electrochemical performance and cycling stability of the anodes.
Establishing a stable electrode-electrolyte interface (SEI) is extremely critical to achieving a reversible silicon anode for lithium ion batteries. Herein, a conformal polyurea layer with hydrogen bonds and polar functional groups is firstly controllably constructed on the silicon electrode as an artificial SEI via molecular layer deposition. The optimized polyurea coating of similar to 3 nm greatly promotes the electrochemical lithium storage performance of silicon anodes, including highly reversible cycling stability (1010 mA h g(-1) after 1000 cycles) and rate capability (1820 mA h g(-1) at 2 A g(-1), 1420 mA h g(-1) at 5 A g(-1)). Analyses show that this polyurea layer can greatly promote lithium ions diffusion kinetic in the silicon electrodes and induce a stable, thin, and LiF-rich SEI with good mechanical stability. Moreover, this polyurea coating shows a significant improvement for larger-size silicon particles (even >150 nm) and superior compatibility with ether-based electrolytes. Notably, the full cells paired with LiFePO4 cathode exhibit impressive cycling stability with a high energy density of 453 Wh kg(-1). This work provides constructive guidance for constructing a stable artificial SEI for silicon anodes.
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