Enhanced Structural and Electrochemical Stability of Self-Similar Rice-Shaped SnO2 Nanoparticles
Enhanced Structural and Electrochemical Stability of Self-Similar Rice-Shaped SnO2 Nanoparticles
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自相似米状 SnO2 纳米颗粒的增强结构和电化学稳定性
DOI：
10.1021/acsami.7b00232
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发表时间：
2017-03-22
影响因子：
9.5
通讯作者：
Ba, Ying
中科院分区：
文献类型：
--
作者：
Pan, Du;Wan, Ning;Ba, Ying
采用一锅法水热合成了Co、F共掺杂的SnO 2纳米粒子（Co-F/SnO 2）。与纯SnO 2和Co/SnO 2电极相比，Co-F/SnO 2电极具有更高的容量、更好的循环性能和倍率性能。在0.1 ℃下50次循环后，可以成功地提供800 mAh g（-1）的高充电容量，并且在5 C下100次循环后可以保持700 mAh的高可逆容量。Co-F/SnO 2纳米粒子优异的储锂性能归因于掺杂Co和F的协同效应，以及具有中等氧缺陷和非活性柱的独特分级自相似结构，这不仅有利于Li离子的快速扩散，而且在电化学循环过程中稳定了结构。
A facile one-pot hydrothermal strategy is applied to prepare Co and F codoped SnO2 (Co-F/SnO2) nanoparticles, which exhibit a unique rice-shaped self-similar structure. Compared with the pristine and Co-doped counterparts (SnO2 and Co/SnO2), the Co-F/SnO2 electrode demonstrates higher capacity, better cyclability, and rate capability as anode material for lithium ion batteries (LIBs). A high charge capacity of 800 mAh g(-1) can be successfully delivered after 50 cycles at 0.1 degrees C, and a high reversible capacity of 700 mAh could be retained after 100 cycles at 5 C. The excellent lithium storage performances of the Co-F/SnO2 nanoparticles could be attributed to the synergetic effects of the doped Co and F, as well as the unique hierarchical self-similar structure with moderate-oxygen defect and inactive pillars, which not only facilitates the fast diffusion of Li ions, but also stabilizes the structure during the electrochemical cycling.