Cross-linked nanohybrid polymer electrolytes with POSS cross-linker for solid-state lithium ion batteries

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Abstract

A new class of freestanding cross-linked hybrid polymer electrolytes (HPEs) with POSS as the cross-linker was prepared by a one-step free radical polymerization reaction. Octavinyl octasilsesquioxane (OV-POSS) with eight functional corner groups was used to provide cross-linking sites for the connection of polymer segments and the required mechanical strength to separate the cathode and anode. The unique cross-linked structure offers additional free volume for the motion of EO chains and provides fast and continuously interconnected ion-conducting channels along the nanoparticles/polymer matrix interface. The HPE exhibits the highest ionic conductivity of 1.39 × 10-3 S cm-1, as well as excellent interfacial compatibility with the Li electrode at 80°C. In particular, LiFePO4/Li cells based on the HPE deliver good rate capability and long-term cycling performance with an initial discharge capacity of 152.1 mAh g-1 and a capacity retention ratio of 88% after 150 cycles with a current density of 0.5 C at 80°C, demonstrating great potential application in high-performance LIBs at elevated temperatures.

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Zhang, J., Li, X., Li, Y., Wang, H., Ma, C., Wang, Y., … Wei, W. (2018). Cross-linked nanohybrid polymer electrolytes with POSS cross-linker for solid-state lithium ion batteries. Frontiers in Chemistry, 6(MAY). https://doi.org/10.3389/fchem.2018.00186

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