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白莹等 ACS Appl. Mater. Interf. 9(2017)9747-9755
2017-05-18 10:15   审核人:

Enhanced Structural and Electrochemical Stability of Self-Similar Rice-Shaped SnO2 Nanoparticles

Du Pan,Ning Wan, Yong Ren,Weifeng Zhang, Xia Lu, Yuesheng Wang, Yong-Sheng Hu,and Ying Bai*

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 C, and a high reversible capacity of 700 mAh g−1 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.



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