Abstract
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 language | English (US) |
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Pages (from-to) | 209-216 |
Number of pages | 8 |
Journal | Journal of Power Sources |
Volume | 305 |
DOIs | |
State | Published - Feb 15 2016 |
Keywords
- 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