Metal oxides are widely evaluated as high‐capacity anode candidates for practical lithium ion battery applications, owing to their attractive volumetric and gravimetric capacities compared with the traditional graphite anode. Synergistic effects on improving electrochemical performance of binary metal oxide anodes have been increasingly reported via different working mechanisms for lithium storage instead of simple combination of two single components. Herein, we report on exploring lithium storage mechanism in Bi₂Mo₃O₁₂ binary metal oxide for the first time as an anode material. In‐situ synchrotron X‐ray diffraction measurements are performed on this exotic material to elucidate lithium storage behaviors, coupled with voltage‐resolved cyclic voltammetry and ex‐situ X‐ray photoelectron spectroscopy analyses. The Bi₂Mo₃O₁₂ anode undergoes an irreversible initial conversion reaction, resulting in metallic Bi and Li₂MoO₄ components through electrochemical lithiation. During successive cycling, these two components reversibly uptake and release Li ions through alloying/de‐alloying and intercalation/de‐intercalation reactions, by forming corresponding Li₃Bi alloy and excessively‐lithiated Li_2+xMoO₄ derivative, respectively. Cycling stability of the Bi₂Mo₃O₁₂ anode material is considerably enhanced by in‐situ composition with Ti₃C₂‐based MXene nanosheets. The Bi₂Mo₃O₁₂@Ti₃C₂ composite anode material can deliver an initial charge capacity of approximately 846 mAh g⁻¹ at 50 mA g⁻¹ and retain at 227 mAh g⁻¹ upon prolonged 1000 cycles at 2.5 A g⁻¹ high charge/discharge current density. This work offers some insights into lithium storage mechanism and composite nanostructure design in Bi−Mo−O binary metal oxide anode towards enhanced electrochemical performance.

中文翻译：

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Ti3C2 MXene复合Bi2Mo3O12二元金属氧化物阳极的储锂机理和循环稳定性研究

金属氧化物由于具有比传统石墨阳极更具吸引力的体积和重量容量，因此被广泛评估为实际锂离子电池应用中的高容量阳极候选材料。通过用于锂存储的不同工作机制而不是两个单一组分的简单组合，越来越多地报道了对改善二元金属氧化物阳极的电化学性能的协同作用。本文中，我们首次报道了在Bi ₂ Mo ₃ O ₁₂二元金属氧化物中作为负极材料探索锂存储机理的方法。原位对这种奇特的材料进行同步加速器X射线衍射测量，以阐明锂的存储行为，并结合电压分辨循环伏安法和非原位X射线光电子能谱分析。Bi ₂ Mo ₃ O ₁₂阳极经历不可逆的初始转化反应，通过电化学锂化产生金属Bi和Li ₂ MoO ₄组分。在连续循环中，这两种成分通过形成相应的Li ₃ Bi合金和过度锂化的Li _{2+ x} MoO，通过合金化/去合金化和插层/脱层反应可逆地吸收和释放锂离子。分别为_4个导数。通过基于Ti ₃ C ₂的MXene纳米片的原位组成，可大大提高Bi ₂ Mo ₃ O ₁₂阳极材料的循环稳定性。Bi ₂ Mo ₃ O ₁₂ @Ti ₃ C ₂复合阳极材料可在50 mA g ^-1下提供约846 mAh g ^-1的初始充电容量，并在2.5 A g下延长1000次循环后可保持在227 mAh g ^-1上^-1高充电/放电电流密度。这项工作为Bi-Mo-O二元金属氧化物阳极的锂存储机理和复合纳米结构设计提供了一些见识，以提高电化学性能。