Chestnut-like SnO 2 /C nanocomposites with enhanced lithium ion storage properties
Chestnut-like SnO 2 /C nanocomposites with enhanced lithium ion storage properties
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DOI：
10.1016/j.nanoen.2016.08.060
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发表时间：
2016-12
期刊：
影响因子：
17.6
通讯作者：
Lien-Ping Yang;T. Dai;Yuecun Wang;D. Xie;R. Narayan;Ju Li;Xiaohui Ning
中科院分区：
文献类型：
--
作者：
Lien-Ping Yang;T. Dai;Yuecun Wang;D. Xie;R. Narayan;Ju Li;Xiaohui Ning
通过在葡萄糖溶液中水热氧化纳米锡，合成了具有多级结构的板栗状SnO2和SnO2/C纳米复合材料。使用 SEM 和 TEM 进行的结构表征表明，SnO2 纳米颗粒由大量随机排列的中空 SnO2 纳米片组成。由于这种结构的电子和离子扩散距离短以及转变应变调节机制，新型 SnO2/C 纳米复合材料表现出增强的锂离子存储性能，容量约为 930 mAh g−1，在 0.1 C 下循环 100 次后容量保留率约为 96%。对 SnO2/C 纳米复合材料电化学驱动的锂化/脱锂的原位 TEM 研究表明： 它们增强的循环稳定性主要得益于空心栗子有限的体积膨胀和出色的机械坚固性。
Chestnut-like SnO2and SnO2/C nanocomposites with hierarchical structures are synthesized by hydrothermally oxidizing Sn nanoparticles in glucose solution. Structural characterizations using SEM and TEM reveal that the SnO2nanoparticles are composed of numerous, randomly arranged SnO2nanosheets with hollow cores. Owing to the short electron and ion diffusion distances and transformation strain accommodation mechanism of this structure the new SnO2/C nanocomposites exhibit enhanced lithium ion storage properties with a capacity of ~930 mAh g−1and capacity retention of about 96% after 100 cycles at 0.1 C. Anin situTEM study of the electrochemically driven lithiation/delithiation of SnO2/C nanocomposites reveals that their enhanced cycling stability is mainly facilitated by the limited volume expansion and excellent mechanical robustness of the hollow chestnuts.