期刊
NANO LETTERS
卷 21, 期 11, 页码 4757-4764出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01241
关键词
solid-electrolyte interphase; lithium metal anodes; PVDF-PAN blends coating; phase separation; lithiophilic interface
类别
资金
- UC San Diego
- China Scholarship Council [201706250088]
- China Postdoctoral Science Foundation [2020TQ0183]
- National Science Foundation [ECCS-1542148]
The porous lithiophilic polymer coating induced by phase separation of PVDF-PAN blends reported in this study can effectively stabilize the lithium metal anode, improving cycling stability and Coulombic efficiency in lithium batteries.
Solid-electrolyte interphase (SEI) plays a pivotal role in stabilizing lithium (Li) metal anode for rechargeable batteries. However, electrolyte-derived SEI often suffers from poor stability, leading to Li dendrite growth, consumption of electrolyte, and short cycle life. Here, we report a porous lithiophilic polymer coating induced by phase separation of polyvinylidenefluoride-polyacrylonitrile (PVDF-PAN) blends for stabilizing Li metal anode. Different from single polymer coating, PVDF-PAN blends protective layer with porous structures caused by phase separation can provide effective Li+ transport channels and regulate uniform Li+ flux. The lithiophilic functional groups of C N and C-F can promote uniform Li deposition and accelerate Li+ diffusion at the same time during plating/stripping process. As a result, Li parallel to NCM811 full cells using PVDF-PAN coated Li present an apparently improved cycling stability and higher Coulombic efficiency with lean electrolyte (7.5 mu L mA h(-1)), limited Li supply (N/P ratio = 2.4), and high areal capacity (4.0 mA h cm(-)(2)).
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