All-Impurities Scavenging, Safe Separators with Functional Metal-Organic-Frameworks for High-Energy-Density Li-Ion Battery

Hye Bin Son, Sujee Cho, Kyungeun Baek, Jaeho Jung, Seoha Nam, Dong Yeob Han, Seok Ju Kang, Hoi Ri Moon, Soojin Park

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Li-ion batteries (LIBs) have wide applications owing to their high-energy density and stable cycle characteristics. Nevertheless, with the rapid expansion of electric vehicle market, issues such as explosion of LIBs and the need to secure a longer driving distance have emerged. In this work, functional metal–organic frameworks (MOFs) are introduced as a separator in LIBs, in which a highly heat-resistant polymer separator is fabricated through electrospinning. The MOFs can scavenge impurities (including gas, water, and hydrofluoric acid) that positively affect battery performance and safety. The multi-functional separator suppresses salt decomposition when a nickel-rich cathode is operated at high voltage and high temperature through it. This delays the deterioration of the cathode interface and results in a superb cycle stability with 75% retention even in the presence of 500 ppm of water in the electrolytes. In addition, the pouch cell is manufactured by enlarging the separator, and the degree of electrode swelling due to gas generation and interface degradation in the pouch state is alleviated to 50% or less. These findings highlight the necessity of scavenging impurities to maintain excellent performance and provides the development direction of functional separators in LIBs.

Original languageEnglish
Article number2302563
JournalAdvanced Functional Materials
Issue number37
StatePublished - 12 Sep 2023

Bibliographical note

Funding Information:
H.B.S and S.C. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) grant (NRF‐2020 M2D8A209308 and NRF‐2020R1A2C3008908).

Publisher Copyright:
© 2023 Wiley-VCH GmbH.


  • functional MOFs
  • functional separator membranes
  • high-energy density lithium-ion batteries
  • high-temperature batteries
  • impurity scavenging


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