Mesoporous Cladophora cellulose separators for lithium-ion batteries

Ruijun Pan, Ocean Cheung, Zhaohui Wang, Petter Tammela, Jinxing Huo, Jonas Lindh, Kristina Edström, Maria Strømme, Leif Nyholm*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)


Much effort is currently made to develop inexpensive and renewable materials which can replace the polyolefin microporous separators conventionally used in contemporary lithium-ion batteries. In the present work, it is demonstrated that mesoporous Cladophora cellulose (CC) separators constitute very promising alternatives based on their high crystallinity, good thermal stability and straightforward manufacturing. The CC separators, which are fabricated using an undemanding paper-making like process involving vacuum filtration, have a typical thickness of about 35 μm, an average pore size of about 20 nm, a Young's modulus of 5.9 GPa and also exhibit an ionic conductivity of 0.4 mS cm-1 after soaking with 1 M LiPF6 EC: DEC (1/1, v/v) electrolyte. The CC separators are demonstrated to be thermally stable at 150 °C and electrochemically inert in the potential range between 0 and 5 V vs. Li+/Li. A LiFePO4/Li cell containing a CC separator showed good cycling stability with 99.5% discharge capacity retention after 50 cycles at a rate of 0.2 C. These results indicate that the renewable CC separators are well-suited for use in high-performance lithium-ion batteries.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalJournal of Power Sources
Early online date7 May 2016
Publication statusPublished - 30 Jul 2016


  • Cellulose
  • Cladophora
  • Crystallinity
  • Lithium-ion battery
  • Paper-making
  • Separator

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry


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