Cation ordering in low-temperature niobium-rich NbWO bronzes: New anodes for high-rate Li-ion batteries

IF 17.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Matter Pub Date : 2024-10-02 DOI:10.1016/j.matt.2024.06.023

Supreeth Nagendran , Amoghavarsha Mahadevegowda , Sundeep Vema , Mohsen Danaie , Weixin Song , Bo Wen , Caterina Ducati , Clare P. Grey

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Abstract

Niobium tungsten oxides are gaining attention as anodes for lithium-ion batteries due to their high volumetric energy storage densities obtained at high cycling rates. Two new niobium tungsten bronze structures, NbWO_5.5 and β-Nb₂WO₈, were prepared with microwave-assisted solution-based methods at 800°C. These adopt a simple tetragonal tungsten bronze (TTB) and a √2 × √2 TTB superstructure, respectively. Nb₃WO_10.5 with a structure closely related to β-Nb₂WO₈ was formed at higher Nb:W ratios. Nb:W ≥ 4 compositions result in two-phase behavior forming Nb₂O₅ and Nb₃WO_10.5, while W-rich bronzes (Nb:W < 1) exhibited local domains of WO₃ within the NbWO_5.5 lattice. Diffraction and electron microscopy analysis revealed cation ordering in the bronzes at different length scales. The microwave synthesis method produced microporous spheres, with the high-Nb-content phases showing promising high-rate capabilities and long cycle lives, making them suitable for energy-storage applications. The microwave-assisted solution method holds potential for synthesizing complex oxide materials across diverse applications.

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低温富铌 NbWO 青铜中的阳离子排序：高倍率锂离子电池的新阳极

铌钨氧化物在高循环速率下具有高体积能量存储密度，因此作为锂离子电池的阳极正日益受到关注。本研究采用微波辅助溶液法，在 800°C 下制备了两种新的铌钨青铜结构：NbWO5.5 和 β-Nb2WO8。它们分别采用了简单的四方钨青铜（TTB）和 √2 × √2 TTB 超结构。在较高的铌:W 比值下，形成了与 β-Nb2WO8 结构密切相关的 Nb3WO10.5。Nb:W ≥ 4 的成分会导致两相行为，形成 Nb2O5 和 Nb3WO10.5，而富 W 青铜（Nb:W <1）则在 NbWO5.5 晶格内显示出局部的 WO3 域。衍射和电子显微镜分析表明，青铜中的阳离子在不同的长度尺度上有序排列。微波合成法产生了微孔球体，其中高铌含量相具有良好的高速率能力和长循环寿命，适合用于储能应用。微波辅助溶液法具有合成复杂氧化物材料的潜力，可用于多种应用领域。

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来源期刊

Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

26.30

自引率

2.60%

发文量

367

期刊介绍： Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content. Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.