Self-terminated oligomers with hyperbranched architecture, also known as STOBA, are combined with lithium-ion battery cathode materials by two different ways: mechanical blending and surface coating. The comparative electrochemical analyses of the assembled coin cells demonstrate that for the materials gained through mechanical blending, no blocking effects are observed at high-temperature condition. For the surface coating ones, STOBA has slight impact on the cell performance at room temperature, but when the ambient temperature exceeds the cross-linking temperature, large area of cross-linking will occur on the surface of the electrode materials, which prevents the lithium ion from extracting and inserting. As a result, the battery totally loses charge–discharge capacity in the high rate discharge condition to ensure the safety when operating at high temperatures.
Studies on the Working Mode of Hyperbranched New Materials STOBA in Lithium-ion Battery Cathode Materials
Lect. Notes Electrical Eng.
2014-12-20
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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