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A functional-gradient-structured ultrahigh modulus solid polymer electrolyte for all-solid-state lithium metal batteries

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Abstract

There is a contradiction between achieving a high modulus solid polymer electrolyte (SPE) and good interface contact in all-solid-state lithium metal batteries to prohibit the dendrite growth and increase the cell cyclability, respectively. Herein, we report a new functional-gradient-structured ultrahigh modulus SPE (FG-SPE) by integrating a ceramic-rich phase and polymer-rich phase. The ceramic-rich phase physically prohibits the dendrite growth, while the polymer-rich phase improves the interface compatibility between the cathode and electrolyte. As a result, this ultrahigh modulus solid polymer electrolyte renders a low charging voltage polarization of 0.5 mA h cm−2 for FG-SPE-based symmetrical batteries. All-solid-state Li/LiFePO4 batteries based on this material show a high specific capacity of 163.2 mA h g−1 at 0.1C, and a high reversible capacity could still be obtained even at a rate of 2C. Importantly, the active material could achieve a high mass loading of 15.6 mg cm−2, which is significant for practical applications.

Graphical abstract: A functional-gradient-structured ultrahigh modulus solid polymer electrolyte for all-solid-state lithium metal batteries

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Publication details

The article was received on 20 Jul 2019, accepted on 23 Sep 2019 and first published on 24 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA07876B
J. Mater. Chem. A, 2019, Advance Article

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    A functional-gradient-structured ultrahigh modulus solid polymer electrolyte for all-solid-state lithium metal batteries

    J. Liu, J. Zhou, M. Wang, C. Niu, T. Qian and C. Yan, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA07876B

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