ie9b05262_si_001.pdf (335.98 kB)
Facile Route for the Fabrication of Polypropylene Separators for Lithium-Ion Batteries with High Elongation and Strong Puncture Resistance
journal contribution
posted on 2019-12-15, 21:29 authored by Jian Kang, Dandan Chen, Bijin Xiong, Nan Zheng, Feng Yang, Ming Xiang, Zhuo ZhengA facile route for fabrication of polypropylene separators
for lithium-ion batteries with high elongation and strong puncture
resistance has been proposed in this work. Polypropylene separators
immersed in paraffin wax have been prepared to introduce small molecules
into separators. The influence of small molecules on mechanical properties
of separators is studied in this work. The elongation at break stretched
in the transverse direction of separators significantly increases
for more than 300% while the puncture depth and force increases 50%
after treatment with paraffin wax for 2 h. Meanwhile, no clear change
of the pore structure can be seen after the treatment. The mechanism
behind it has been discussed as well. Moreover, comprehensive performance
of batteries equipped with modified separators has been evaluated.
The modified separators exhibit same electrochemical performances
compared to original separators. Generally, paraffin modification
is a facile and effective route for mechanical enhancement of separators
without sacrificing comprehensive electrochemical properties.