Ti1.3Nb1.76O7 porous microspheres: a low-niobium niobate for Li+-storage anodes

IF 3.1 4区化学 Q3 ELECTROCHEMISTRY

Journal of Solid State Electrochemistry Pub Date : 2026-06-11 DOI:10.1007/s10008-026-06621-0

Yanxin Zhang, Zhenying Sun, Xuehua Liu, Chuan Zhang, Zhongzhu Liu, Chunfu Lin

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Abstract

Niobate Li⁺-storage anode materials, especially TiNb₂O₇ (TNO), have garnered significant attention for their intrinsically safe characteristics and substantial capacities as well as fast and stable electrochemical kinetics. However, several limitations hinder the application of TNO in lithium-ion battery anodes, chief among them being its high niobium content. Herein, by adjusting the ratio of Ti and Nb elements in TNO, a novel low-niobium Ti_1.3Nb_1.76O₇ (LN-TNO) anode material with a micro-sized porous spherical morphology and oxygen-vacancy proportion of 2.8% has been exploited. The oxygen vacancies provide more active sites for electrochemical reactions, enabling impressive rate capability with a 5 C to 0.1 C capacity retention of 70.4%. LN-TNO demonstrates stable cycling performance with 86.5% capacity retention after 250 cycles at 5 C. Even at − 10 °C, it delivers a super high-rate behavior with 46.7% capacity retention from 5 C to 0.1 C, along with stable cycling performance retaining 90.0% of its capacity upon 500 cycles at 5 C. Owing to the outstanding properties mentioned above, LN-TNO demonstrates promising potential for practical applications in high-performance Li⁺ storage.

Graphical abstract

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Ti1.3Nb1.76O7多孔微球：用于Li+存储阳极的低铌酸盐

铌酸盐锂离子存储负极材料，特别是TiNb2O7 (TNO)，因其本质安全、容量大、电化学动力学快速稳定而受到广泛关注。然而，TNO在锂离子电池负极中的应用存在一些限制，其中主要是其高铌含量。通过调整TNO中Ti和Nb元素的比例，制备了一种具有微孔球形形貌、氧空位率为2.8%的新型低铌Ti1.3Nb1.76O7 （LN-TNO）负极材料。氧空位为电化学反应提供了更多的活性位点，实现了令人印象深刻的速率能力，5℃至0.1℃的容量保持率为70.4%。LN-TNO具有稳定的循环性能，在5℃下循环250次后容量保留率为86.5%。即使在- 10℃下，它也能在5℃至0.1℃期间提供46.7%的容量保留率，以及在5℃下循环500次时保持90.0%容量的稳定循环性能。由于上述突出的性能，LN-TNO在高性能Li+存储方面的实际应用具有很大的潜力。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Solid State Electrochemistry 工程技术-电化学

CiteScore

4.80

自引率

4.00%

发文量

227

审稿时长

4.1 months

期刊介绍： The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.