Assembly of CoFe2O4 Nanocrystals into Superparticles with Tunable Porosities for Use as Anode Materials for Lithium-Ion Batteries
Assembly of CoFe2O4 Nanocrystals into Superparticles with Tunable Porosities for Use as Anode Materials for Lithium-Ion Batteries
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DOI：
10.1021/acsanm.2c01929
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发表时间：
2022-07
影响因子：
5.9
通讯作者：
Yuchi Yang;Jingyu Xiao;Yan Xia;Xiangyun Xi;Tongtao Li;Dong Yang;A. Dong
中科院分区：
文献类型：
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作者：
Yuchi Yang;Jingyu Xiao;Yan Xia;Xiangyun Xi;Tongtao Li;Dong Yang;A. Dong
将开放式架构转换为自组装的紧密堆积的上层结构对于其组件暴露以及所呈现的整体性能至关重要。在这里，我们描绘了一个高产率，乳液为基础的组装策略，使一步组织的预成型纳米晶体成晶体超微粒可调的大孔隙度。我们表明，调整水/己烷的比例和/或在乳化过程中的剪切速率允许一个宽范围的调制内产生的SP的大孔的大小和密度。此外，我们证明了大孔隙率的演变，具有可忽略的影响的长程有序的纳米晶体，有利于快速的质量传输和上级电化学性能在随后的演示锂存储。除了单组分纳米晶体外，该组装路线也适用于大孔二元纳米晶体的制备。
Incorporating open architectures into a self-assembled close-packed superstructure is vital to its component exposure and hence the overall performance presented. Here, we depict a high-yield, emulsion-based assembly strategy that enables the one-step organization of preformed nanocrystals into crystalline superparticles with tunable macroporosity. We show that tuning the water/hexane ratio and/or the shearing rate during the emulsification process allows a wide-range modulation of the size and density of macropores generated within SPs. In addition, we demonstrate that the evolution of macroporosity, having negligible influence on the long-range ordering of nanocrystals, benefits the fast mass transport and superior electrochemical performance in the subsequent demonstrations for lithium storage. In addition to the single-component nanocrystals, this assembly route is also applicable to the fabrication of macroporous binary nanocrystal SPs.