One-Step Polymerizations Enable Facile Construction and Structural Optimization of Graft Copolymer Electrolytes |
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| Authors: | Kairui Guo Shaoqiao Li Zhen Shi Xingping Zhou Zhigang Xue |
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| Institution: | Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074 China |
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| Abstract: | The development of poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) is limited by the semi-crystalline nature of PEO and the extremely strong EO-Li+ interactions. To promote the rapid migration of Li+, a one-step method combining radical polymerization and ring-opening polymerization catalyzed simultaneously by lithium carboxylate is proposed to construct multi-component graft copolymer electrolytes (GCPEs) in this study. Tailored macroinitiator with catalytic and initiated sites (PAALi(OH-Br)) realizes one-step polymerizations of vinyl monomers and cyclic monomers, and provides GCPEs with poly(ethylene glycol) (PEG) and poly(ε-caprolactone) (PCL) side chains. The grafted structure of GCPE greatly facilitates the intra-chain hopping of Li+, resulting in excellent ionic conductivity. The introduction of PCL further improves the tLi+ of GCPE. The three-component graft copolymer electrolyte constructed by polystyrene (PS), PEO, and PCL exhibits high tensile stress (1.62 MPa), a high ionic conductivity (2.4 × 10?5 S cm?1, 30 °C), and a high tLi+ of 0.47 and high electrochemical stability. |
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| Keywords: | graft copolymer electrolyte lithium metal batteries orthogonal polymerizations self-initiated and self-catalyzed strategy |
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