Temperature-dependent on/off PVP@TiO2 separator for safe Li-storage

Temperature-dependent on/off PVP@TiO2 separator for Li-ion batteries (LIBs) has been fabricated by using a modified electrospinning method. The PVP@TiO2 separators show excellent wettability towards liquid electrolytes and high ionic conductivity due to its high porosity and outstanding capillarity....

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Bibliographic Details
Published in:Journal of membrane science 2018-11, Vol.565, p.33-41
Main Authors: Jiang, Yunhong, Ding, Yanhuai, Zhang, Ping, Li, Feng, Yang, Zhongmei
Format: Article
Language:English
Subjects:
Capillarity
Li-ion batteries
On/off separator
Reliability
TiO2 nanotubes
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Summary:Temperature-dependent on/off PVP@TiO2 separator for Li-ion batteries (LIBs) has been fabricated by using a modified electrospinning method. The PVP@TiO2 separators show excellent wettability towards liquid electrolytes and high ionic conductivity due to its high porosity and outstanding capillarity. The battery with PVP@TiO2 separator will be suspended as the operation temperature reaches 60 °C, then revives after being brought back to room temperature. The PVP@TiO2 separator is thermally stable up to 180 °C without significant dimensional shrinkage. The structural integrity of the hybrid separator can be maintained even after being heat-treated at 500 °C. The use of this hybrid separator is one approach to improve the reliability and safety of the LIBs. •PVP@TiO2 separator exhibits high ionic conductivity and excellent thermal stability.•PVP@TiO2 separator has reusable on/off function.•The structural integrity can be maintained after being heat-treated to 500 °C.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2018.08.008