Peng ChengLong, Shi Mingming, Li Fei, Wang Yang, Liu Xueqin, Liu HuaSheng, Li Zhen
Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences Wuhan 430074 China
RSC Adv. 2021 Oct 13;11(53):33481-33489. doi: 10.1039/d1ra05565h. eCollection 2021 Oct 8.
Natural molybdenite, an inexpensive and naturally abundant material, can be directly used as an anode material for lithium-ion batteries. However, how to release the intrinsic capacity of natural molybdenite to achieve high rate performance and high capacity is still a challenge. Herein, we introduce an innovative, effective, and one-step approach to preparing a type of heterostructure material containing 1T@2H MoS crafted from insertion and expansion of natural molybdenite. The metallic 1T phase formed can significantly improve the electronic conductivity of MoS. At the same time, 1T@2H MoS heterostructures can provide an internal electric field (E-field) to accelerate the migration rate of electrons and ions, promote the charge transfer behaviour, and ensure the reaction reversibility and lithium storage kinetics. Such worm-like 1T@2H MoS heterostructures also have a large specific surface area and a large number of defects, which will help shorten the lithium-ion transmission distance and provide more ion transmission channels. As a result, it exhibits a discharge capacity of 788 mA h g remarkably at 100 mA g after 485 cycles and stable cycling performance. It also shows excellent magnification performance of 727 mA h g at 1 A g, compared to molybdenite concentrate. Briefly, this work's heterostructure architectures open up a new avenue for applying natural molybdenite in lithium-ion batteries, which has the potential to achieve large-scale commercial applications.
天然辉钼矿是一种廉价且天然储量丰富的材料，可直接用作锂离子电池的负极材料。然而，如何释放天然辉钼矿的本征容量以实现高倍率性能和高容量仍是一个挑战。在此，我们介绍一种创新、有效且一步法制备一种由天然辉钼矿插入和膨胀制成的含1T@2H MoS的异质结构材料的方法。形成的金属1T相可显著提高MoS的电子导电性。同时，1T@2H MoS异质结构可提供内电场（E场）以加速电子和离子的迁移速率，促进电荷转移行为，并确保反应可逆性和锂存储动力学。这种蠕虫状的1T@2H MoS异质结构还具有大的比表面积和大量缺陷，这将有助于缩短锂离子传输距离并提供更多离子传输通道。结果，在485次循环后，它在100 mA g下表现出显著的788 mA h g的放电容量和稳定的循环性能。与辉钼矿精矿相比，它在1 A g下还显示出727 mA h g的优异倍率性能。简而言之，这项工作的异质结构架构为天然辉钼矿在锂离子电池中的应用开辟了一条新途径，具有实现大规模商业应用的潜力。
