Title

Sol-gel synthesis of porous Na 3 Fe 2 (PO 4 ) 3 with enhanced sodium-ion storage capability

Document Type

Journal Article

Publication Title

Ionics

Publisher

Institute for Ionics

School

School of Engineering

RAS ID

28486

Comments

Cao, Y., Liu, Y., Chen, T., Xia, X., Zhang, L. -., Zhang, J., & Xia, Y. (2019). Sol-gel synthesis of porous na 3 fe 2 (PO 4 ) 3 with enhanced sodium-ion storage capability. Ionics, 25(3), 1083-1090. Available here.

Abstract

Porous Na 3 Fe 2 (PO 4 ) 3 has been synthesized via a sol-gel method using citric acid as a metal ion complexing agent and polyvinyl alcohol as a structure-guiding agent. The obtained porous Na 3 Fe 2 (PO 4 ) 3 with particle size distribution of 40–60 nm has a typical NASICON structure in a space group of C2/c and the specific surface area is 40.2 m 2 g −1 . Electrochemical measurement results indicate that the initial discharge-specific capacity of porous Na 3 Fe 2 (PO 4 ) 3 is up to 92.5 mAh g −1 and maintains at 86 mAh g −1 after 200 cycles at 20 mA g −1 (92% of theoretical capacity) and the corresponding coulombic efficiency is up to 100% as well as high rate capability performance (71.5 mAh g −1 after 1000 cycles under 500 mA g −1 ). The excellent electrochemical properties are attributed to its particular [Fe 2 (PO 4 ) 3 ] “lantern units” stacked crystal structure and porous morphology, which significantly improves intercalation/de-intercalation kinetic of sodium ions. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.

DOI

10.1007/s11581-018-2804-z

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