Electrode-supported thin α-alumina separators for lithium-ion batteries

Wanliang Mi, Gaurav Sharma, Xueliang Dong, Yi Jin, Jerry Lin

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Lithium ion batteries with an inorganic separator offer improved safety and enhanced reliability. The free-standing inorganic separators recently studied for lithium ion batteries are brittle and expensive. To address these issues, this paper reports the synthesis of a new and stable electrode-supported separator using a low-cost ceramic powder. Thin and porous α-Al2O3 separator films of thicknesses down to 40 μm were coated on Li4Ti5O12 (LTO) electrode by blade-coating a slurry of α-Al2O3, water and a small amount of polyvinyl alcohol (PVA). The performance of the LTO/Li cells with coated α-Al2O3 separator improves with decreasing PVA content. Cells with coated α-Al2O3 separator containing 0.4wt% PVA exhibit similar discharge capacity but better rate capability than those with commercial polypropylene (PP) or thick sintered α-Al2O3 separator. The coated α-Al2O3 separator does not react with LTO even after many charge/discharge cycles. Fabrication of the electrode-supported α-Al2O3 separator is scalable and cost-effective, offering high potential for practical application in industrial lithium ion battery manufacturing.

Original languageEnglish (US)
Pages (from-to)209-216
Number of pages8
JournalJournal of Power Sources
StatePublished - Feb 15 2016


  • AlO separator
  • Battery safety
  • Electrode supported separator
  • LiTiO electrode
  • Lithium ion battery

ASJC Scopus subject areas

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


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