Zhang Yaqiong, Tao Huachao, Li Tao, Du Shaolin, Li Jinhang, Zhang Yukun, Yang Xuelin
College of Materials and Chemical Engineering , China Three Gorges University , 8 Daxue Road , Yichang , Hubei 443002 , China.
Collaborative Innovation Center for Microgrid of New Energy , Yichang , Hubei 443002 , China.
ACS Appl Mater Interfaces. 2018 Oct 17;10(41):35206-35215. doi: 10.1021/acsami.8b12079. Epub 2018 Oct 8.
Developing a high-performance anode with high reversible capacity, rate performance, and great cycling stability is highly important for sodium-ion batteries (SIBs). MoS has attracted extensive interest as the anode for SIBs. Herein, the vertically oxygen-incorporated MoS nanosheets/carbon fibers are constructed via a facile hydrothermal method and then by simple calcination in air. Oxygen incorporation into MoS can increase the defect degree and expand the interlayer spacing. Vertical MoS nanosheet array coated on carbon fibers not only can expose rich active sites and reduce the diffusion distance of Na, but also improve the electronic conductivity and enhance structural stability. Meanwhile, interlayer-expanded MoS can decrease Na diffusion resistance and increase accessible active sites for Na. In this work, the electrode combining the oxygen-incorporated strategy with vertical MoS nanosheet-integrated carbon fibers displays high specific capacities of 330 mAh g over 100 cycles at a current density of 0.1 A g together with excellent rate behavior as the anode for SIBs. This strategy offers a helpful way for improving the electrochemical performance.
开发具有高可逆容量、倍率性能和良好循环稳定性的高性能阳极对于钠离子电池（SIB）至关重要。MoS作为SIB的阳极已引起广泛关注。在此，通过简便的水热法，然后在空气中进行简单煅烧，构建了垂直掺氧的MoS纳米片/碳纤维。向MoS中掺入氧可增加缺陷程度并扩大层间距。涂覆在碳纤维上的垂直MoS纳米片阵列不仅可以暴露丰富的活性位点并缩短Na的扩散距离，还能提高电子导电性并增强结构稳定性。同时，层间扩展的MoS可以降低Na扩散电阻并增加Na可及的活性位点。在这项工作中，将掺氧策略与垂直MoS纳米片集成碳纤维相结合的电极在0.1 A g的电流密度下100次循环内显示出330 mAh g的高比容量，并且作为SIB的阳极具有优异的倍率性能。该策略为改善电化学性能提供了一种有用的方法。
