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| Type |
Symposium |
| Area |
R&D beyond Carbon Society II |
| Room No. |
Room 306A |
| Time |
THU 16:15-: |
| Code |
ENVR-2 |
| Subject |
Advanced separators for safe Li-ion batteries |
| Authors |
Jung-Je Woo
Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Korea |
| Abstract |
Lithium ion batteries have been using as representative energy storage systems for various applications. To improve battery safety, a battery separator should prevent internal short circuit under abnormal condition. Most of the current separators are based on polyolefins, such as polyethylene and polypropylene, which lose mechanical integrity over 150℃. In this study, we developed a thermally stable separator based on a poly (phenylene oxide)/SiO2 composite by a dry phase inversion method. The separator endures up to 250° C without obvious thermal deformation. A NMC/graphite cell using the composite separator showed excellent cycling performance, especially at high C-rates. This separator layer was directly coated on an anode to form a separator/electrode assembly (SEA), which offers enhanced interfacial properties, high mechanical strength, and thermal stability. Another way to improve safety of batteries is to reduce the flammability of the liquid electrolyte. A new flame retarding separator (FRS) based on brominated poly (phenylene oxide)(BPPO) remarkably reduced the flammability of the liquid electrolyte without decrease in electrochemical performances such as ionic conductivity and cycle life of a lithium-ion battery.
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| E-mail |
jungje79@gmail.com |
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122nd General Meeting of the KCS