A Polymer-Assisted Spinodal Decomposition Strategy toward Interconnected Porous Sodium Super Ionic Conductor-Structured Polyanion-Type Materials and Their Application as a High-Power Sodium-Ion Battery Cathode.

Advanced Science
Hailong XiongSheng Dai

Abstract

A general polymer-assisted spinodal decomposition strategy is used to prepare hierarchically porous sodium super ionic conductor (NASICON)-structured polyanion-type materials (e.g., Na3 V2 (PO4 )3 , Li3 V2 (PO4 )3 , K3 V2 (PO4 )3 , Na4 MnV(PO4 )3 , and Na2 TiV(PO4 )3 ) in a tetrahydrofuran/ethanol/H2 O synthesis system. Depending on the boiling point of solvents, the selective evaporation of the solvents induces both macrophase separation via spinodal decomposition and mesophase separation via self-assembly of inorganic precursors and amphiphilic block copolymers, leading to the formation of hierarchically porous structures. The resulting hierarchically porous Na3 V2 (PO4 )3 possessing large specific surface area (≈77 m2 g-1 ) and pore volume (≈0.272 cm3 g-1 ) shows a high specific capacity of 117.6 mAh g-1 at 0.1 C achieving the theoretical value and a long cycling life with 77% capacity retention over 1000 cycles at 5 C. This method presented here can open a facile avenue to synthesize other hierarchically porous polyanion-type materials.

References

Nov 13, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Hu Dong, Martin J Blunt
Oct 23, 2014·Journal of the American Chemical Society·Jongkook HwangJinwoo Lee
Apr 19, 2016·Chemistry : a European Journal·Bishnu Prasad BastakotiYusuke Yamauchi
Feb 22, 2017·Advanced Materials·Zelang JianWen Chen
Sep 12, 2020·Chemical Reviews·Li-Hua ChenBao-Lian Su
Sep 16, 2020·Advanced Materials·Shen YuBao-Lian Su

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Citations

Aug 12, 2021·Chemistry : a European Journal·Hailong XiongZhen-An Qiao

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