期刊
JOURNAL OF POWER SOURCES
卷 333, 期 -, 页码 184-192出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.09.132
关键词
Lithium-ion batteries; Separator; X-ray tomography; Transport properties; Characterisation; Tortuosity
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/N032888/1, EP/N001583/1, EP/M009394/1]
- Royal Academy of Engineering
- National Physical Laboratory (NPL)
- EPSRC [EP/K005030/1]
- Engineering and Physical Sciences Research Council [EP/N001583/1, EP/J021199/1, EP/K005030/1, 1528603, EP/N032888/1] Funding Source: researchfish
- EPSRC [EP/N032888/1, EP/K005030/1, EP/J021199/1, EP/N001583/1] Funding Source: UKRI
Separators are an integral component for optimising performance and safety of lithium-ion batteries; therefore, a clear understanding of how their microstructure affects cell performance and safety is crucial. Phase contrast X-ray microscopy is used here to capture the microstructures of commercial monolayer, tri-layer, and ceramic-coated lithium-ion battery polymer separators. Spatial variations in key structural parameters, including porosity, tortuosity factor and pore size distribution, are determined through the application of 3D quantification techniques and stereology. The architectures of individual layers in multi-layer membranes are characterised, revealing anisotropy in porosity, tortuosity factor and mean pore size of the three types of separator. Detailed structural properties of the individual layers of multi-layered membranes are then related with their expected effect on safety and rate capability of cells. (C) 2016 Published by Elsevier B.V.
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