NASICON-structured Na3.1Zr1.95Mg0.05Si2PO12 solid electrolyte for solid-state sodium batteries
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Using stable inorganic solid electrolyte to replace organic liquid electrolyte could significantly reduce potential safety risks of rechargeable batteries. Na-superionic conductor (NASICON)-structured solid electrolyte is one of the most promising sodium solid electrolytes and can be employed in solid-state sodium batteries. In this work, a NASICON-structured solid electrolyte Na3.1Zr1.95Mg0.05Si2PO12 was synthesized through a facile solid-state reaction, yielding high sodium-ionic conductivity of 1.33 × 10−3 S·cm−1 at room temperature. The results indicate that Mg2+ is a suitable and economical substitution ion to replace Zr4+, and this synthesis route can be scaled up for powder preparation with low cost. In addition to electrolyte material preparation, solid-state batteries with Na3.1Zr1.95Mg0.05Si2PO12 as electrolyte were assembled. A specific capacity of 57.9 mAh·g−1 is maintained after 100 cycles under a current density of 0.5C rate at room temperature. The favorable cycling performance of the solid-state battery suggests that Na3.1Zr1.95Mg0.05Si2PO12 is an ideal electrolyte candidate for solid-state sodium batteries.
KeywordsSolid electrolyte NASICON-type structure Sodium-ionic conductivity Solid-state sodium battery
This work is financially supported by the National Key Research and Development Program of China (No. 2016YFB0100105), Strategic Priority Program of the Chinese Academy of Sciences (No. XDA09010203), Zhejiang Provincial Natural Science Foundation of China (Nos. LD18E020004, LY18E020018 and LY18E030011) and the Youth Innovation Promotion Association CAS (No. 2017342).