Low Temperature Tetragonal Tungsten Bronze Oxides for Li-ion Storage

Abstract

Nb-based tungsten bronze oxides have emerged as attractive materials in various fields, owing to the structural openings and simple synthesis method. In this work, the tetragonal tungsten bronze (TTB) NaWNbO₆ was prepared by solid state reaction at a relatively low temperature of 775 °C. The local structure was systematically studied by solid state nuclear magnetic resonance (SSNMR) with the aid of transition electronic microscopy (TEM). The analysis indicates that NaWNbO₆ has pentagonal, square, and triangular tunnels. Notably, square tunnels were partly occupied (50%) by Na, which creates the ability for the Li-ion storage with a volumetric capacity of 210 A·h·L⁻¹ at 0.2 C. The 2D ²³Na-²³Na EXSY results further suggest the ability of ions to fast exchange between the tetragonal and pentagonal tunnels, resulting in a high-rate performance 20 C.

Keywords

Tetragonal tungsten bronze / Solid-state ²³Na NMR / ⁹³Nb NMR spectrum / Fast ion exchange

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