Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education), and Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
gpwu@zju.edu.cn (G.P.W.)
xuzk@zju.edu.cn (Z.K.X.)
收稿:2019-04-12,
修回:2019-5-28,
录用:2019-5-30,
网络首发:2019-07-18,
纸质出版:2019-10
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Zhang, C.; Liang, H. Q.; Pi, J. K.; Wu, G. P.; Xu, Z. K. Polypropylene separators with robust mussel-inspired coatings for high lithium-ion battery performances. Chinese J. Polym. Sci. 2019, 37, 1015–1022.
Chao Zhang, Hong-Qing Liang, Jun-Ke Pi, et al. Polypropylene Separators with Robust Mussel-inspired Coatings for High Lithium-ion Battery Performances[J]. Chinese Journal of Polymer Science, 2019, 37(10): 1015-1022.
Zhang, C.; Liang, H. Q.; Pi, J. K.; Wu, G. P.; Xu, Z. K. Polypropylene separators with robust mussel-inspired coatings for high lithium-ion battery performances. Chinese J. Polym. Sci. 2019, 37, 1015–1022. DOI: 10.1007/s10118-019-2310-4.
Chao Zhang, Hong-Qing Liang, Jun-Ke Pi, et al. Polypropylene Separators with Robust Mussel-inspired Coatings for High Lithium-ion Battery Performances[J]. Chinese Journal of Polymer Science, 2019, 37(10): 1015-1022. DOI: 10.1007/s10118-019-2310-4.
The performances of lithium-ion batteries (LIBs) are dependent on the wettability and stability of porous separators. Mussel-inspired coatings seem to be useful to improve the surface wettability of commercialized polyolefin separators. However
it is still a challenge to guarantee their stability under polar electrolytes. Herein
we report a facile and versatile way to enhance the wettability and stability of polypropylene separators by constructing robust polydopamine (PDA) coatings triggered with CuSO
4
/H
2
O
2
. These coatings were conveniently deposited on the polypropylene separator surfaces and the PDA-coated separators exhibited the improved surface wettability and thermal stability. The electrolyte uptake increased nearly two folds from the pristine separator to the modified ones. Correspondingly
the ionic conductivity also rose from 0.82 mS·cm
–1
to 1.30 mS·cm
–1
. Most importantly
the CuSO
4
/H
2
O
2
-triggered PDA coatings were very stable under strong polar electrolytes
endowing the cells with excellent cycle performance and enhanced C-rate capacity. Overall
the results unequivocally demonstrate that application of PDA coatings on polyolefin separator triggered by CuSO
4
/H
2
O
2
is a facile and efficient method for improving the wettability and stability of separators for high LIBs performance.
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