Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 35, Pages 18043-18054Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta06697d
Keywords
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Funding
- National Natural Science Foundation of China [51771076, 51831009]
- Innovative Research Groups of the National Natural Science Foundation of China [NSFC51621001]
- Guangdong Pearl River Talents Plan [2017GC010218]
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Composite solid-state electrolytes (CSEs) that integrate the merits of different components are considered to be promising candidates for next-generation high-energy density lithium metal batteries. Herein, we have successfully designed a flexible CSE membrane consisting of the ceramic conducting Li1.3Al0.3Ti1.7(PO4)(3)(LATP) filler, polyethylene oxide (PEO) matrix, and 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) ionic liquid. In particular, the addition of ionic liquid (BMP-TFSI) can not only decrease the interface impedance between the polymer and LATP ceramic fillers and improve the ionic conductivity, but also prevent the adverse reaction between Ti(4+)in LATP and Li metal and further enhance the interface stability. Benefitting from the synergistic effect of organic-inorganic hybrids, the obtained composite electrolyte membrane achieves an excellent ionic conductivity of 2.42 x 10(-4)S cm(-1)at 30 degrees C and a wide electrochemical stability window of 5 V (vs.Li+/Li). Moreover, the CSE membrane exhibits outstanding Li dendrite suppression capability, which is proved by galvanostatic Li plating/stripping tests for 1000 h. Assembled with this solid electrolyte membrane and a commercial LiFePO(4)cathode, all-solid-state lithium metal batteries demonstrate superior rate capability and outstanding cycling stability at both 30 and 45 degrees C. These results demonstrate that such a flexible composite electrolyte is a promising alternative electrolyte for practical high-energy density all-solid-state batteries.
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