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Superior lithium ion conduction of polymer electrolyte with comb-like structure via solvent-free co-polymerization for bipolar all-solid-state lithium battery

Abstract

Herein, novel solid polymer electrolytes are synthesized through solvent-free “thiol-ene” co-polymerization with different chain length. It demonstrates that the optimal polymer electrolyte exhibits excellent thermal stability up to 331oC, considerable ionic conductivity of 5.05×10-5 S cm-1 at ambient temperature, wide electrochemical window (0-5.05 V) and good compatibility with lithium metal electrode. In addition, solid-state monopolar LiFePO4//Li battery with integrated cathode and electrolyte is assembled, and it delivers the maximum capacity of 167.39 mAh g-1, which is close to theoretical capacity of LiFePO4 cathode. Moreover, the discharge capacity keeps 122.17 mAh g-1 after 200 cycles at 60 oC, which is 75% capacity retention. Remarkably, the monopolar cell could cycle well at room temperature with a stabilized discharge capacity of 100 mAh g-1 at 0.1C for the 60th cycle. Especially, taking advantage of the non-fluidity of solid electrolytes, bipolar cell with high voltage of 6.07 V is also assembled, which is extremely beneficial for the volume energy density improving and cost decreasing as well as the enhancement of the reliability of the cell packs. The bipolar cell delivers an initial specific capacity of 136.3 mAh g-1 with a 76% retention after 40 cycles. Furthermore, bipolar cell can work well under the conditions of bending, cutting and even nail penetration. Consequently, this work provides an advanced strategy to facile synthesize polymer electrolytes as well as fabrication of bipolar cells with high voltages, which is in favor of energy density improvement.

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Publication details

The article was received on 14 May 2018, accepted on 11 Jun 2018 and first published on 12 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA04477E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Superior lithium ion conduction of polymer electrolyte with comb-like structure via solvent-free co-polymerization for bipolar all-solid-state lithium battery

    Z. Wei, S. Chen, J. wang, Z. Wang, Z. Zhang, X. Y. Yao, Y. Deng and X. Xu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04477E

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