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Issue 40, 2019
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Dendrite-free lithium–metal batteries at high rate realized using a composite solid electrolyte with an ester–PO4 complex and stable interphase

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Abstract

Uneven growth of lithium dendrites and large volume expansion of Li–metal batteries based on a Li anode upon cycling cause low coulombic efficiency, fast capacity decay, and safety concerns. Herein, inspired by the hybrid concept we for the first time prepare a PCL–LAGP composite polymer electrolyte. The chemical interactions of PO43− and ester groups are revealed through a detailed investigation. Given the synergistic effect of organic–inorganic hybrids, the composite electrolyte achieves dendrite-free Li deposition, which is confirmed by long-term galvanostatic polarization tests over 4 mA cm−2 and in situ TEM observation of potentiostatic cycling. Moreover, the soft feature of PCL results in the formation of a stable interphase layer with low resistance to sustain the volume expansion. A LiFePO4/Li all-solid-state battery demonstrates a high coulombic efficiency close to 100%, superior cycling stability and a rate capability of over 10C. The PCL–LAGP composite is a promising solid electrolyte for practical applications at high current density.

Graphical abstract: Dendrite-free lithium–metal batteries at high rate realized using a composite solid electrolyte with an ester–PO4 complex and stable interphase

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Publication details

The article was received on 02 Aug 2019, accepted on 21 Sep 2019 and first published on 23 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA08415K
J. Mater. Chem. A, 2019,7, 23173-23181

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    Dendrite-free lithium–metal batteries at high rate realized using a composite solid electrolyte with an ester–PO4 complex and stable interphase

    Z. Zhang, L. Zhang, Y. Liu, T. Yang, Z. Wang, X. Yan and C. Yu, J. Mater. Chem. A, 2019, 7, 23173
    DOI: 10.1039/C9TA08415K

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