Abstract Hollow nanoplates-aggregated SnO2 nanofibers were fabricated from electrospinning process and two-step heat treatment. Se particles were dissolved in electrospinning solution and played a critical role in the formation of small-sized SnSe nanoplates during the selenization heat treatment. During the oxidation heat treatment, due to the well-known Kirkendall diffusion process, the dense SnSe nanoplates were transformed into hollow SnO2 nanoplates. Three other SnO2 nanostructures including SnO2 hollow nanoplates, hollow nanofiber with hierarchical SnO2 nanocrystals, and SnO2 hollow nanofibers were prepared as comparison. The capacity of hollow nanoplate-aggregated SnO2 nanofibers after the 700th discharge process was 375 mA h g−1 when cycled at a high current density of 3 A g−1, whereas those of the comparison SnO2 nanostructured electrodes in the order listed were 78, 277, and 262 mA h g−1, respectively. The high structural stability of the synthesized hollow nanoplate-aggregated SnO2 nanofiber during repeated lithiation and delithiation processes resulted in lithium-ion battery anode with longer cycle life.

中文翻译：

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用于高性能锂离子电池负极的多孔纳米纤维由空心 SnO2 纳米板构建块组成

摘要 采用静电纺丝工艺和两步热处理工艺制备了中空纳米板-聚集的SnO2纳米纤维。Se 颗粒溶解在静电纺丝溶液中，并在硒化热处理过程中对小尺寸 SnSe 纳米片的形成起到关键作用。在氧化热处理过程中，由于众所周知的柯肯德尔扩散过程，致密的 SnSe 纳米片转变为空心的 SnO2 纳米片。制备了其他三种 SnO2 纳米结构，包括 SnO2 中空纳米板、具有分级 SnO2 纳米晶体的中空纳米纤维和 SnO2 中空纳米纤维作为比较。当在 3 A g-1 的高电流密度下循环时，中空纳米板聚集的 SnO2 纳米纤维在第 700 次放电过程后的容量为 375 mA h g-1，而按所列顺序比较的 SnO2 纳米结构电极的电流分别为 78、277 和 262 mA h g-1。合成的中空纳米板聚集的 SnO2 纳米纤维在重复锂化和脱锂过程中的高结构稳定性导致锂离子电池负极具有更长的循环寿命。