Elucidating the Polymeric Binder Distribution within Lithium-ion Battery Electrodes Using SAICAS

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Polymeric binder distribution within electrodes is crucial to guarantee the electrochemical performance of lithium-ion batteries (LIBs) for their long-term use in applications such as electric vehicles and energy-storage systems. However, due to limited analytical tools, such analyses have not been conducted so far. Herein, the adhesion properties of LIB electrodes at different depths are measured using a surface and interfacial cutting analysis system (SAICAS). Moreover, two LiCoO2 electrodes, dried at 130 and 230 degrees C, are carefully prepared and used to obtain the adhesion properties at every 10m of depth as well as the interface between the electrode composite and the current collector. At high drying temperatures, more of the polymeric binder material and conductive agent appears adjacent to the electrode surface, resulting in different adhesion properties as a function of depth. When the electrochemical properties are evaluated at different temperatures, the LiCoO2 electrode dried at 130 degrees C shows a much better high-temperature cycling performance than does the electrode dried at 230 degrees C due to the uniform adhesion properties and the higher interfacial adhesion strength.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

CUTTING ANALYSIS SYSTEM; TERM CYCLE LIFE; ADHESION PROPERTIES; COMPOSITE ELECTRODES; SILICON ANODES; PERFORMANCE; SEPARATORS; TEMPERATURE; SURFACE

Citation

CHEMPHYSCHEM, v.19, no.13, pp.1627 - 1634

ISSN
1439-4235
DOI
10.1002/cphc.201800072
URI
http://hdl.handle.net/10203/244678
Appears in Collection
MS-Journal Papers(저널논문)
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