Constructing Sub 10 nm Scale Interfused TiO2/SiOx Bicontinuous Hybrid with Mutual-Stabilizing Effect for Lithium Storage,ACS Nano

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Constructing Sub 10 nm Scale Interfused TiO2/SiOx Bicontinuous Hybrid with Mutual-Stabilizing Effect for Lithium Storage
ACS Nano ( IF 15.8 ) Pub Date : 2023-01-16 , DOI: 10.1021/acsnano.2c10381
Ruohan Yu _{1,

2} , Yexin Pan ₃ , Yihang Liu ₁ , Liang Zhou _{1,

4} , Dongyuan Zhao ₁ , Jinsong Wu _{1,

2} , Liqiang Mai _{1,

4}

Affiliation

TiO₂ has been considered as a promising intercalation lithium-ion-battery (LIB) anode material owing to its robust cyclability. However, it suffers from low capacity. Herein, we construct a sub 10 nm scale interfused TiO₂/SiO_x hybrid with a bicontinuous structure, in which bridged TiO₂ nanoparticles (over 80 wt %) are densely packed within a wormlike SiO_x network, through the simple oxidation of MAX Ti₃SiC₂ ceramic. State-of-the-art in situ microscopy characterization unravels a “mutual-stabilizing” effect from the interfused TiO₂/SiO_x hybrid upon lithiation. That is to say, the two interpenetrated active components restrain the volume expansion of each other with the stress being relieved through abundant interfaces. Meanwhile, the stress generated from one phase functioned as the compressive force on the other phase and vice versa, offsetting the overall volume effect and synergistically reinforcing the structure integrity. Benefiting from the “mutual-stabilizing” effect, the TiO₂/SiO_x composite manifests a high and stable specific capacity (∼671 mAh g^–1 after 580 cycles at 0.1 A g^–1) with a low volume expansion of ∼14% even in an extended potential window of 0.01–3.0 V (vs Li⁺/Li). The concept of mutual-stabilizing effect, in principle, applies to a wide class of interfused bicontinuous hybrids, providing insight into the design of LIB anode materials with high capacity and longevity.

中文翻译：

构建亚 10 nm 级混合 TiO2/SiOx 双连续杂化物，具有锂储存的相互稳定作用

TiO ₂因其稳健的循环性能而被认为是一种很有前途的插层锂离子电池 (LIB) 负极材料。然而，它的缺点是容量低。在此，我们构建了一个亚 10 nm 尺度的混合 TiO ₂ /SiO _x杂化物，具有双连续结构，其中桥接的 TiO ₂纳米颗粒（超过 80 wt%）通过 MAX Ti 的简单氧化被密集地包裹在蠕虫状 SiO _x_网络中3 SiC ₂陶瓷。最先进的原位显微镜表征揭示了融合的 TiO ₂ /SiO _x的“相互稳定”效应混合锂化。也就是说，两个相互穿插的活性组分通过丰富的界面来抑制彼此的体积膨胀并释放应力。同时，一相产生的应力充当另一相的压缩力，反之亦然，抵消了整体体积效应并协同增强了结构完整性。受益于“互稳定”效应，TiO ₂ /SiO _x复合材料表现出高而稳定的比容量（在 0.1 A g ^–1下循环 580 次后为∼671 mAh g ^–1），体积膨胀率低，约为 ∼14%即使在 0.01–3.0 V 的扩展电位窗口中（相对于 Li ⁺/李）。原则上，相互稳定效应的概念适用于广泛的融合双连续杂化物，为高容量和长寿命的 LIB 负极材料的设计提供了见解。

更新日期：2023-01-16

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