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An improved 9 micron thick separator for a 350 Wh/kg lithium metal rechargeable pouch cell

Author

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  • Zhi Chang

    (Central South University
    National Institute of Advanced Industrial Science and Technology (AIST))

  • Huijun Yang

    (National Institute of Advanced Industrial Science and Technology (AIST))

  • Anqiang Pan

    (Central South University)

  • Ping He

    (Nanjing University)

  • Haoshen Zhou

    (National Institute of Advanced Industrial Science and Technology (AIST)
    Nanjing University)

Abstract

The use of separators that are thinner than conventional separators (> 20 µm) 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 µm thick) using current-driven electrosynthesis, which aggregates the electrolyte in the MOF channels. Compared to unmodified polypropylene separators, the MOF-modified separator (9 µm 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 µm 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 °C.

Suggested Citation

  • Zhi Chang & Huijun Yang & Anqiang Pan & Ping He & Haoshen Zhou, 2022. "An improved 9 micron thick separator for a 350 Wh/kg lithium metal rechargeable pouch cell," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34584-z
    DOI: 10.1038/s41467-022-34584-z
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