Wu Jinyang, Jing Mingjun, Wu Tianjing, Yi Mingguang, Bai Yansong, Deng Wenhui, Zhu Yirong, Yang Yingchang, Wang Xianyou
National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education School of Chemistry, Xiangtan University, Xiangtan 411105, PR China.
National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education School of Chemistry, Xiangtan University, Xiangtan 411105, PR China.
J Colloid Interface Sci. 2023 Jul;641:831-841. doi: 10.1016/j.jcis.2023.03.066. Epub 2023 Mar 15.
Mo-based heterostructures offer a new strategy to improve the electronics/ion transport and diffusion kinetics of the anode materials for sodium-ion batteries (SIBs). MoO/MoS hollow nanospheres have been successfully designed via in-situ ion exchange technology with the spherical coordination compound Mo-glycerates (MoG). The structural evolution processes of pure MoO, MoO/MoS, and pure MoS materials have been investigated, illustrating that the structureofthenanospherecan be maintained by introducing the S-Mo-S bond. Based on the high conductivity of MoO, the layered structure of MoS and the synergistic effect between components, as-obtained MoO/MoS hollow nanospheres display enhanced electrochemical kinetic behaviors for SIBs. The MoO/MoS hollow nanospheres achieve a rate performance with 72% capacity retention at a current of 3200 mA g compared to 100 mA g. The capacity can be restored to the initial capacity after a current returns to 100 mA g, while the capacity fading of pure MoS is up to 24%. Moreover, the MoO/MoS hollow nanospheres also exhibit cycling stability, maintaining a stable capacity of 455.4 mAh g after 100 cycles at a current of 100 mA g. In this work, the design strategy for the hollow composite structure provides insight into the preparation of energy storage materials.
基于钼的异质结构为改善钠离子电池（SIBs）负极材料的电子/离子传输及扩散动力学提供了一种新策略。通过与球形配位化合物钼甘油酸酯（MoG）进行原位离子交换技术，成功设计出了MoO/MoS中空纳米球。研究了纯MoO、MoO/MoS和纯MoS材料的结构演变过程，结果表明通过引入S-Mo-S键可以维持纳米球的结构。基于MoO的高导电性、MoS的层状结构以及各组分之间的协同效应，所制备的MoO/MoS中空纳米球对SIBs表现出增强的电化学动力学行为。与100 mA g时相比，MoO/MoS中空纳米球在3200 mA g电流下实现了72%的容量保持率的倍率性能。当电流恢复到100 mA g时，容量可恢复到初始容量，而纯MoS的容量衰减高达24%。此外，MoO/MoS中空纳米球还表现出循环稳定性，在100 mA g电流下循环100次后保持稳定容量455.4 mAh g。在这项工作中，中空复合结构的设计策略为储能材料的制备提供了思路。
