

FOLLOWUS
a.Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), ERC of Membrane and Water Treatment (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
b.Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
zhubk@zju.edu.cn (B.K.Z.)
songyouzhi@tsinghua.edu.cn (Y.Z.S.)
Received:11 March 2020,
Revised:2020-5-1,
Accepted:11 May 2020,
Online First:07 August 2020,
Published:10 September 2020
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Yan, Y.; Kong, Q. R.; Sun, C. C.; Yuan, J. J.; Huang, Z.; Fang, L. F.; Zhu, B. K.; Song, Y. Z. Copolymer-assisted polypropylene separator for fast and uniform lithium ion transport in lithium-ion batteries. Chinese J. Polym. Sci. 2020, 38, 1313–1324
Yan Yan, Qing-Ran Kong, Chuang-Chao Sun, et al. Copolymer-assisted Polypropylene Separator for Fast and Uniform Lithium Ion Transport in Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2020, 38(12): 1313-1324.
Yan, Y.; Kong, Q. R.; Sun, C. C.; Yuan, J. J.; Huang, Z.; Fang, L. F.; Zhu, B. K.; Song, Y. Z. Copolymer-assisted polypropylene separator for fast and uniform lithium ion transport in lithium-ion batteries. Chinese J. Polym. Sci. 2020, 38, 1313–1324 DOI: 10.1007/s10118-020-2455-1.
Yan Yan, Qing-Ran Kong, Chuang-Chao Sun, et al. Copolymer-assisted Polypropylene Separator for Fast and Uniform Lithium Ion Transport in Lithium-ion Batteries[J]. Chinese Journal of Polymer Science, 2020, 38(12): 1313-1324. DOI: 10.1007/s10118-020-2455-1.
In lithium-ion batteries (LIBs)
separators play a vital role in lithium-ion (Li
+
) transport
and thus affect rate performance
battery life
and safety. Here
a new kind of multifunctional copolymer poly(acrylonitrile-
co
-lithium acrylate-
co
-butyl acrylate) (PAAB-Li) is synthesized through soap-free emulsion polymerization
and is used to form homogeneous-covered separator based on PP matrix by a simple dip-annealing process. Compared to the bare PP separator
the modified separators with PAAB-Li enable higher ionic conductivity
higher lithium ion transference number (increased from 0.360 to 0.525)
and lower interface impedance (reduced from 155 Ω to 34 Ω). It has been indicated that PAAB-Li functional layer significantly promotes the fast transport of Li
+
and improves the compatibility of the separator/electrolyte-electrode interface. The LiCoO
2
/graphite cells with the PAAB-Li-assisted separator demonstrate excellent cycle stability and rate performance. In addition
the Li symmetric cells with the modified separator stably cycle over 800 h
indicating the functional layer effectively suppresses the lithium dendrite growth. This facile strategy can be easily applied to LIBs requiring high safety and even be scalable to Li metal batteries. Moreover
the possible mechanism of the PAAB-Li functional layer promoting fast and uniform Li
+
transport is discussed in this paper.
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