Journal
POLYMER
Volume 55, Issue 24, Pages 6282-6292Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.09.067
Keywords
Mechanical property; Molecular dynamics; Porous polypropylene
Categories
Funding
- U.S. Department of Energy. Office of Science, Basic Energy Sciences [DESC0001160]
- National Science Foundation [CMMI-1030821, CMMI-1235092, CMMI-1418696, CMMI-1358673]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1235092, 1030821] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1418696] Funding Source: National Science Foundation
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Porous polypropylene (PP) is commonly used as separator materials for lithium ion batteries (LIB). Its mechanical properties, especially critical for abuse tolerance and durability of LIB, are subject to change in different environments. To capture the mechanical responses of a porous PP separator, its microstructure was mapped into separate atomistic models of bulk crystalline phases and oriented amorphous nanofibers. These structures were relaxed and stretched in vacuum, water, and dimethyl carbonate (DMC) using molecular dynamics (MD). The simulation results revealed DMC molecules penetrated into the amorphous PP nanofiber, and reduced the local density and the Young's modulus. In contrast, water increased the Young's modulus of the amorphous PP nanofiber. Furthermore, neither water nor DMC had any impact on the Young's modulus of the crystalline phase. These results suggest that the DMC induced separator softening was attributed to the strong attraction of the less-polar DMC solvent with the amorphous fibrous PP nanofibers. (C) 2014 Elsevier Ltd. All rights reserved.
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