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Synthesis of Uniquely Structured SnO2 Hollow Nanoplates and Their Electrochemical Properties for Li-Ion Storage

机译：独特结构的SnO2空心纳米板的合成及其电化学性能

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摘要

A new mechanism for the transformation of nanostructured metal selenides into uniquely structured metal oxides via the Kirkendall effect, which results from the different diffusion rates of metal and Se ions and O-2 gas, is proposed. SnSe nanoplates are selected as the first target material and transformed into SnO2 hollow nanoplates by the Kirkendall effect. SnSe-C composite powder, in which SnSe nanoplates are attached or stuck to amorphous carbon microspheres, transforms into several tens of SnO2 hollow nanoplates by a thermal oxidation process under an air atmosphere. Core-shell-structured SnSe-SnSe2@SnO2, SnSe2@SnO2, Se-SnSe2@SnO2, and Se@SnO2 and yolk-shell-structured Se@void@SnO2 intermediates are formed step-by-step during the oxidation of the SnSe nanoplates. The uniquely structured SnO2 hollow nanoplates have superior cycling and rate performance for Li-ion storage. Additionally, their discharge capacities at the 2nd and 600th cycles are 598 and 500 mA h g(-1), respectively, and the corresponding capacity retention measured from the 2nd cycle is as high as 84%.
机译：提出了一种通过柯肯德尔效应将纳米结构的金属硒化物转变为独特结构的金属氧化物的新机理，这种机理是由于金属，硒离子和O-2气体的扩散速率不同而引起的。 SnSe纳米板被选为第一个目标材料，并通过Kirkendall效应转化为SnO2空心纳米板。 SnSe-C复合粉末（其中SnSe纳米板附着或粘贴到无定形碳微球上）在空气气氛下通过热氧化过程转变成数十个SnO2空心纳米板。核壳结构化SnSe-SnSe2 @ SnO2，SnSe2 @ SnO2，Se-SnSe2 @ SnO2和Se @ SnO2以及蛋黄壳结构化Se @ void @ SnO2中间体是在SnSe氧化过程中逐步形成的纳米板。结构独特的SnO2空心纳米板具有出色的循环和倍率性能，可用于锂离子存储。此外，它们在第二个和第600个循环中的放电容量分别为598和500 mA h g（-1），并且从第二个循环中测得的相应容量保持率高达84％。

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