Department of Engineering Chemistry, Chungbuk National University, Chungbuk 361-763, Republic of Korea.
Nanoscale. 2018 Oct 21;10(39):18734-18741. doi: 10.1039/c8nr06727a. Epub 2018 Oct 1.
Among the various nanostructures, porous materials with controlled pore structures have been widely used for designing transition metal-based anode materials for lithium-ion batteries, because they provide good access to electrolyte and can effectively accommodate stress arising from volume changes. In particular, ternary transition metal oxide materials containing nanovoids, arranged with high degree of periodicity, are ideal for enhancing lithium-ion storage capability. In this study, we provide a method using spray pyrolysis for the synthesis of mesoporous multicomponent metal oxide microspheres containing Ni and Mo components and N-doped carbon, in which three-dimensionally ordered 40 nm-sized mesopores are interconnected. During the synthesis, polystyrene nanobeads are used as a sacrificial template and are readily eliminated via thermal decomposition. Increased concentrations of polystyrene nanobeads enables the formation of open channels throughout the microspheres. When employed as a lithium-ion battery anode, the mesoporous multicomponent metal oxide microspheres containing Ni and Mo components and N-doped carbon exhibit high reversible capacity, good cycling stability, and excellent rate performance. After 1000 cycles, the microspheres deliver a discharge capacity of 693 mA h g at a current density of 1.0 A g.
在各种纳米结构中，具有受控孔结构的多孔材料已被广泛用于设计基于过渡金属的锂离子电池阳极材料，因为它们可以很好地接触电解液，并能有效缓解因体积变化而产生的应力。特别是，具有纳米空隙的三元过渡金属氧化物材料，其周期性程度较高，是增强锂离子存储能力的理想材料。在本研究中，我们提供了一种使用喷雾热解法合成含有 Ni 和 Mo 成分以及氮掺杂碳的介孔多组分金属氧化物微球的方法，其中包含三维有序的 40nm 介孔，相互连通。在合成过程中，聚苯乙烯纳米球被用作牺牲模板，通过热分解很容易去除。增加聚苯乙烯纳米球的浓度可以在整个微球中形成开放的通道。当用作锂离子电池阳极时，含有 Ni 和 Mo 成分以及氮掺杂碳的介孔多组分金属氧化物微球表现出高可逆容量、良好的循环稳定性和优异的倍率性能。经过 1000 次循环后，在 1.0A/g 的电流密度下，微球的放电容量为 693mAh/g。
