In Situ Built Nanoconfined TiO2 Particles in Robust-Flexible MXene@rGO Conductive Framework Enabling High-Performance Hybrid Magnesium–Sulfur Batteries,Advanced Energy Materials

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In Situ Built Nanoconfined TiO2 Particles in Robust-Flexible MXene@rGO Conductive Framework Enabling High-Performance Hybrid Magnesium–Sulfur Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-17 , DOI: 10.1002/aenm.202300417
Miao Guo ₁ , Chongyang Yuan ₁ , Tian Xu ₁ , Shulin Zhong ₁ , Wenbin Wang ₁ , Tongxin Zou ₁ , Tengfei Zhang ₂ , Xuebin Yu ₁

Affiliation

The exploration of new and efficient sulfur cathodes through nanostructured materials design is vital for the development of high-performance metal–sulfur batteries, which is a promising candidate for next-generation energy storage systems. However, the shuttle behavior and sluggish reaction kinetics of polysulfides hinder the application of sulfur cathodes. Herein, a 3D MXene/reduced graphene oxide (rGO) composite conductive framework with superior specific surface area, structural stability, and ionic/electronic conductivity is constructed. On this basis, the TiO₂ nanoparticles, in situ grown in the interlayer between MXene and rGO can be used as adsorptive and catalytic active site for polysulfides to accelerate the electrochemical reaction kinetics and alleviate the shuttle effect, thereby improving cycle stability. Consequently, the sulfur-loaded MXene-TiO₂@rGO composite electrodes present a high reversible capacity of 1052.0 mAh g⁻¹ at 0.2 C after 200 cycles, favorable high-rate capability, and splendid long-term performance, retaining 445.6 mAh g⁻¹ capacity after 1000 cycles at 2 C in hybrid Mg/Li–S batteries. This work provides a new insight for using MXene as the sulfur host with high performance for metal–sulfur batteries.

中文翻译：

在坚固灵活的 MXene@rGO 导电框架中原位构建纳米限制 TiO2 颗粒，实现高性能混合镁硫电池

通过纳米结构材料设计探索新型高效硫阴极对于高性能金属硫电池的开发至关重要，金属硫电池是下一代储能系统的有希望的候选者。然而，多硫化物的穿梭行为和缓慢的反应动力学阻碍了硫阴极的应用。在此，构建了具有优异比表面积、结构稳定性和离子/电子导电性的3D MXene/还原氧化石墨烯（rGO）复合导电框架。在此基础上，TiO ₂在MXene和rGO之间的层间原位生长的纳米粒子可以用作多硫化物的吸附和催化活性位点，以加速电化学反应动力学并减轻穿梭效应，从而提高循环稳定性。因此，负载硫的MXene-TiO ₂ @rGO复合电极在0.2 C下经过200次循环后表现出1052.0 mAh g ^-1的高可逆容量，良好的高倍率性能和出色的长期性能，保留了445.6 mAh g ^-混合镁/锂硫电池在 2 C 下循环 1000 次后容量为^{1 。}这项工作为使用 MXene 作为高性能金属硫电池的硫主体提供了新的见解。

更新日期：2023-05-17

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