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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Polyol-Mediated Solvothermal Synthesis and Electrochemical Performance of Nanostructured V2O5 Hollow Microspheres
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Polyol-Mediated Solvothermal Synthesis and Electrochemical Performance of Nanostructured V2O5 Hollow Microspheres

机译：多元醇介导的溶剂热合成纳米结构的V2O5空心微球及其电化学性能

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摘要

Hollow vanadyl glycolate nanostructured microspheres were synthesized via a highly scalable and template-free polyol-induced solvothermal process. Subsequent calcination transformed the precursor material into vanadium pentoxide, a well-studied transition metal oxide. The vanadyl glycolate nanoparticles were synthesized through a self-seeding process and then aggregated around N2 microbubbles formed during the reaction that acted as "quasi-micelles" due to the large polarization discrepancy between nitrogen and water. The proposed formation mechanism provides a firm understanding of the processes leading to the observed hollow microsphere morphology. The thermally treated material was tested as a cathode for lithium-ion battery and showed excellent cycle stability and high rate performance. The exceptional electrochemical performance was attributed to the relatively thin-walled structure that ensured fast phase penetration between the electrolyte and active material and shortened lithium-ion migration distance. The prolonged cycling stability is ascribed to the inherent morphological void that can readily accommodate volume expansion and contraction upon cycling.
机译：通过高度可扩展且无模板的多元醇诱导的溶剂热工艺合成了空心钒酸羟乙酸盐纳米结构微球。随后的煅烧将前体材料转化为五氧化二钒，这是一种经过充分研究的过渡金属氧化物。乙醇酸钒氧钒纳米颗粒是通过自种过程合成的，然后在反应过程中形成的N2微气泡周围聚集，由于氮气和水之间的极化差异较大，该气泡起着“准胶束”的作用。所提出的形成机理提供了对导致观察到的中空微球形态的过程的牢固理解。经热处理的材料经测试可作为锂离子电池的正极，并显示出出色的循环稳定性和高倍率性能。出色的电化学性能归因于相对薄的壁结构，该结构确保了电解质和活性材料之间的快速相渗透以及缩短的锂离子迁移距离。延长的循环稳定性归因于固有的形态学空隙，其可以容易地适应循环时的体积膨胀和收缩。

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