期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-34584-z
关键词
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资金
- National Basic Research Programme of China [2021YFB3800300]
- NSF of China [21633003, U1801251]
- National Natural Science Foundation of China [51874362]
Thin separators can improve the energy densities of batteries but also increase the risk of short circuits. In this study, an improved thin metal-organic frameworks separator is reported to enhance the resistance to dendrite formation and cycling stability of high-voltage lithium batteries in carbonate electrolytes.
The use of separators that are thinner than conventional separators (> 20 mu m) would improve the energy densities and specific energies of lithium batteries. However, thinner separators increase the risk of internal short circuits from lithium dendrites formed in both lithium-ion and lithium metal batteries. Herein, we grow metal-organic frameworks (MOFs) inside the channels of a polypropylene separator (8 mu m thick) using current-driven electrosynthesis, which aggregates the electrolyte in the MOF channels. Compared to unmodified polypropylene separators, the MOF-modified separator (9 mu m thick) vastly improves the cycling stability and dendrite resistance of cells assembled with Li metal anodes and carbonate-based electrolytes. As a demonstration, a 354 Wh kg(-1) pouch cell with a lithium metal anode and LiNi0.8Co0.15Al0.05O2 (NCA)-based cathode (N/P = 3.96) is assembled with 9 mu m layer of the MOF-modified separator and retains 80% of its capacity after 200 cycles (charged at 75 mA g(-1), discharged at 100 mA g(-1)) at 25 degrees C. Thin separators can improve batteries' energy densities but increase cell shortcircuit risks. Here, the authors report an improved thin metal-organic frameworks separator to improve the dendrite formation resistance and cycling stability of high-voltage lithium battery in carbonate electrolytes.
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