Effect of Al2O3 coatings prepared by RF sputtering on polyethylene separators for high-power lithium ion batteries

Lee, Taejoo; Kim, Wan-Keun; Lee, Yun-Ju; Ryou, Myung‐Hyun; Lee, Yong Min

doi:10.1007/s13233-014-2163-1

Cited by 66 publications

(34 citation statements)

References 30 publications

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“…The crystallinity of polyethylene was calculated with the Equation (1). (1) where; ΔH is the heat of fusion of polyethylene sample. ΔH° is the heat of fusion of linear polyethylene, which equals to 290 J/g [16].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

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Impact of AlCl3 and FeCl2 Addition on Catalytic Behaviors of TiCl4/MgCl2/THF Catalysts for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization

Niyomthai

Jongsomjit

Praserthdam

2018

Bull. Chem. React. Eng. Catal.

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The present research focuses on elucidating of the impact of Lewis acids including AlCl3 and FeCl2 addition on catalytic behaviors during ethylene polymerization and ethylene/1-hexene copolymerization over the TiCl4/MgCl2/THF catalyst (Cat. A). In this study, the Cat. A with the absence and presence of Lewis acids was synthesized via the chemical route. Then, all catalyst samples were characterized and tested in the slurry polymerization. For ethylene polymerization, using the Cat. A with the presence of AlCl3 apparently gave the highest activity among other catalysts. In addition, the activity of catalysts tended to increase with the presence of the Lewis acids. This can be attributed to an enhancement of active center distribution by the addition of Lewis acids leading to larger amounts of the isolated Ti species. Moreover, with the presence of Lewis acids, the effect of hydrogen on the decreased activity was also less pronounced. Considering ethylene/1-hexene copolymerization, it revealed that the catalyst with the presence of mixed Lewis acids (AlCl3 + FeCl2) exhibited the highest activity. It is suggested that the presence of mixed Lewis acids possibly caused a change in acidity of active sites, which is suitable for copolymerization. However, activities of all catalysts in ethylene/1-hexene copolymerization were lower than those in ethylene polymerization. The effect of hydrogen on the decreased activity for both polymerization and copolymerization system was found to be similar with the presence of Lewis acids. Based on this study, it is quite promising to enhance the catalytic activity by addition of proper Lewis acids, especially when the pressure of hydrogen increases. The characteristics of polymers obtained upon the presence of Lewis acids will be discussed further in more detail. Copyright © 2018 BCREC Group. All rights reservedReceived: 22nd January 2018; Revised: 18th March 2018; Accepted: 19th March 2018How to Cite: Niyomthai, T., Jongsomjit, B., Praserthdam, P. (2018). Impact of AlCl3 and FeCl2 Addition on Catalytic Behaviors of TiCl4/MgCl2/THF Catalysts for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (3): 393-404 (doi:10.9767/bcrec.13.3.2116.393-404)Permalink/DOI: https://doi.org/10.9767/bcrec.13.3.2116.393-404

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Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…Polyethylene (PE) is the most widely used plastic in this world. As commodity plastic, its properties are varied upon the end use [1,2]. One of the most well-known PE is the linear low-density polyethylene (LLDPE).…”

Section: Introductionmentioning

confidence: 99%

Impact of AlCl3 and FeCl2 Addition on Catalytic Behaviors of TiCl4/MgCl2/THF Catalysts for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization

Niyomthai

Jongsomjit

Praserthdam

2018

Bull. Chem. React. Eng. Catal.

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“…Since the separators in LIBs must have good affinities toward organic liquid electrolytes, their water contact angles [18,19] and electrolyte uptake amount [13,14,16] were also measured. The contact angles of the separators are nearly identical (~120 ) owing to the same raw materials and production conditions.…”

Section: Normalized Gurley Numbermentioning

confidence: 99%

In-depth correlation of separator pore structure and electrochemical performance in lithium-ion batteries

Lee

Park

Jeon

et al. 2016

Journal of Power Sources

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“…Composite separators prepared by introducing surface coating layers containing ceramic compounds such as aluminum oxide (Al 2 O 3 ), silica (SiO 2 ), tin oxide (TiO 2 ), and nickel oxide (NiO), and polymers such as polyethylene oxide (PEO), poly(vinylidene fluoride), and polydopamine have been studied [10][11][12][13] In our previous study, we demonstrated the effectiveness of adding thermally resistant coating layers to PE separators, which significantly improved the thermal dimensional stability of the PE separators without impeding the cell performance [5,14].…”

Section: Introductionmentioning

confidence: 99%

New flame-retardant composite separators based on metal hydroxides for lithium-ion batteries

Yeon

Lee

Ryou

et al. 2015

Electrochimica Acta

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Effect of Al2O3 coatings prepared by RF sputtering on polyethylene separators for high-power lithium ion batteries

Cited by 66 publications

References 30 publications

Impact of AlCl3 and FeCl2 Addition on Catalytic Behaviors of TiCl4/MgCl2/THF Catalysts for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization

Impact of AlCl3 and FeCl2 Addition on Catalytic Behaviors of TiCl4/MgCl2/THF Catalysts for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization

In-depth correlation of separator pore structure and electrochemical performance in lithium-ion batteries

New flame-retardant composite separators based on metal hydroxides for lithium-ion batteries

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