Journal
RSC ADVANCES
Volume 4, Issue 99, Pages 56147-56155Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra09220a
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Funding
- Ministry of Science and Technology of Taiwan [NSC 102-2113-M-008-006-MY3]
- Industrial Technology Research Institute of Taiwan [2012-C1-2885]
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Self-terminated hyper-branched oligomers (STOBA) were coated and then melted on a Li(Ni0.4Co0.2Mn0.4) O-2 cathode to form a dense polymer film at high temperatures. The physical and structural changes of the polymer layer at different temperatures and charge conditions were investigated by nitrogen adsorption-desorption, X-ray photoelectron spectroscopy, resistance measurements, scanning electron microscopy, and solid-state Li-7-NMR and C-13-NMR spectroscopy in order to improve the understanding of the role of the STOBA layer in the enhancement of the safety mechanism of lithium ion batteries. The morphological change of the STOBA layer from the porous to nonporous state at the temperature of a thermal runaway of a battery was demonstrated. The change in the resistance values at high temperatures revealed that the STOBA coating is helpful for the prevention of internal short-circuiting and thermal runaway. Most importantly, the Li-7-NMR results acquired at a very high spinning speed (50 kHz) allow the monitoring of the subtle changes in the local environments of the Li+ ions and their interaction and mobility in the STOBA-cathode interface as functions of temperature and charge states. The combined characterization results improve the understanding of how the STOBA layer can contribute to the safety features of lithium ion batteries.
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