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tortuosity 2

battery safety 1

cold start 1

composite separator 1

energy conversion 1

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mesoscale morphology 1

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Effect of catalyst layer mesoscopic pore-morphology on cold start process of PEM fuel cells

Ahmed Mohmed DAFALLA, Fangming JIANG

Frontiers in Energy 2021, Volume 15, Issue 2, Pages 460-472 doi: 10.1007/s11708-021-0733-4

Abstract: The CCL mesoscale morphology is characterized by two tortuosity factors of the ionomer network and poreCCL to proton exchange membrane (PEM), thus enhancing the water storage in PEM, while reducing the tortuosity

Keywords： cold start energy conversion fuel cells mesoscale morphology tortuosity water management

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A comparative study on polypropylene separators coated with different inorganic materials for lithium-ion batteries

Linghui Yu, Jiansong Miao, Yi Jin, Jerry Y.S. Lin

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3, Pages 346-352 doi: 10.1007/s11705-017-1648-9

Abstract: Coating commercial porous polyolefin separators with inorganic materials can improve the thermal stability of the polyolefin separators and hence improve the safety of lithium-ion batteries. Several different inorganic materials have been studied for the coating. However, there lacks a study on how different inorganic materials affect the properties of separators, in terms of thermal stability and cell performance. Herein, we present such a study on coating a commercial polypropylene separator with four inorganic materials, i.e., Al O , SiO , ZrO and zeolite. All inorganic coatings have improved thermal stability of the separators although with differences. The coating layers add 28%–45% of electrical resistance compared with the pure polypropylene separator, but all the cells prepared with the coated polypropylene separators have the same electrical chemical performance as the uncoated separator in terms of rate capability and capacities at different temperatures.

Keywords： lithium-ion battery battery safety composite separator porosity tortuosity