Liu Yanfei, Lei Jianfei, Chen Ying, Liang Chenming, Ni Jing
Longmen Laboratory, School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471000, China.
School of Chemistry and Material Science, Hubei Engineering University, Xiaogan 432000, China.
Nanomaterials (Basel). 2023 Jul 7;13(13):2025. doi: 10.3390/nano13132025.
The hierarchical structure is an ideal nanostructure for conversion-type anodes with drastic volume expansion. Here, we demonstrate a tin-doping strategy for constructing FeO brushes, in which nanowires with exposed (001) facets are stacked into the hierarchical structure. Thanks to the tin-doping, the conductivity of the Sn-doped FeO has been improved greatly. Moreover, the volume changes of the Sn-doped FeO anodes can be limited to ~4% vertical expansion and ~13% horizontal expansion, thus resulting in high-rate performance and long-life stability due to the exposed (001) facet and the unique hierarchical structure. As a result, it delivers a high reversible lithium storage capacity of 580 mAh/g at a current density of 0.2C (0.2 A/g), and excellent rate performance of above 400 mAh/g even at a high current density of 2C (2 A/g) over 500 cycles, which is much higher than most of the reported transition metal oxide anodes. This doping strategy and the unique hierarchical structures bring inspiration for nanostructure design of functional materials in energy storage.
这种分层结构对于具有剧烈体积膨胀的转换型阳极来说是一种理想的纳米结构。在此，我们展示了一种用于构建FeO刷的锡掺杂策略，其中具有暴露（001）面的纳米线堆叠成分层结构。得益于锡掺杂，Sn掺杂FeO的导电性得到了极大提高。此外，Sn掺杂FeO阳极的体积变化可限制在垂直膨胀约4%和水平膨胀约13%，因此由于暴露的（001）面和独特的分层结构而具有高倍率性能和长寿命稳定性。结果，在0.2C（0.2 A/g）的电流密度下，它具有580 mAh/g的高可逆锂存储容量，即使在2C（2 A/g）的高电流密度下经过500次循环，也具有高于400 mAh/g的优异倍率性能，这远高于大多数已报道的过渡金属氧化物阳极。这种掺杂策略和独特的分层结构为储能功能材料的纳米结构设计带来了启示。
