Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
zshen@pku.edu.cn (Z.H.S.)
fanxh@pku.edu.cn (X.H.F.)
收稿:2021-07-14,
修回:2021-8-25,
录用:2021-9-2,
网络首发:2021-11-04,
纸质出版:2022-01-01
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Liu, D.; Wu, F.; Shen, Z. H.; Fan, X. H. Safety-enhanced polymer electrolytes with high ambient-temperature lithium-ion conductivity based on ABA triblock copolymers. Chinese J. Polym. Sci. 2022, 40, 21–28
Dong Liu, Fan Wu, Zhi-Hao Shen, et al. Safety-enhanced Polymer Electrolytes with High Ambient-temperature Lithium-ion Conductivity Based on ABA Triblock Copolymers[J]. Chinese Journal of Polymer Science, 2022, 40(1): 21-28.
Liu, D.; Wu, F.; Shen, Z. H.; Fan, X. H. Safety-enhanced polymer electrolytes with high ambient-temperature lithium-ion conductivity based on ABA triblock copolymers. Chinese J. Polym. Sci. 2022, 40, 21–28 DOI: 10.1007/s10118-021-2648-2.
Dong Liu, Fan Wu, Zhi-Hao Shen, et al. Safety-enhanced Polymer Electrolytes with High Ambient-temperature Lithium-ion Conductivity Based on ABA Triblock Copolymers[J]. Chinese Journal of Polymer Science, 2022, 40(1): 21-28. DOI: 10.1007/s10118-021-2648-2.
Liquid electrolytes used in lithium-ion batteries suffer from leakage
flammability
and lithium dendrites
making polymer electrolyte a potential alternative. Herein
a series of ABA triblock copolymers (ABA-
x
) containing a mesogen-jacketed liquid crystalline polymer (MJLCP) with a polynorbornene backbone as segment A and a second polynorbornene-based polymer having poly(ethylene oxide) (PEO) side chains as segment B were synthesized through tandem ring-opening metathesis polymerizations. The block copolymers can self-assemble into ordered morphologies at 200 °C. After doping of lithium salts and ionic liquid (IL)
ABA-
x
self-assembles into cylindrical structures. The MJLCP segments with a high glass transition temperature and a stable liquid crystalline phase serve as physical crosslinking points
which significantly improve the mechanical performance of the polymer electrolytes. The ionic conductivity of ABA-
x
/lithium salt/IL is as high as 10
−3
S·cm
−1
at ambient temperature owing to the high IL uptake and the continuous phase of conducting PEO domains. The relationship between ionic conductivity and temperature fits the Vogel-Tamman-Fulcher (VTF) equation. In addition
the electrolyte films are flame retardant owing to the addition of IL. The polymer electrolytes with good safety and high ambient-temperature ionic conductivity developed in this work are potentially useful in solid lithium-ion batteries.
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