期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 5, 页码 3427-3436出版社
AMER CHEMICAL SOC
DOI: 10.1021/am405557c
关键词
tin oxide; solvothermal; nitrogen doping; graphene; aerogels; lithium ion batteries
资金
- 973 Project [2012CB932303]
- National Natural Science Foundation of China [50972153, 51072215, 51172261]
3D macroscopic tin oxide/nitrogen-doped graphene frame-works (SnO2/GN) were constructed by a novel solvothermal-induced self-assembly process, using SnO2 colloid as precursor (crystal size of 3-7 nm). Solvothermal treatment played a key role as N,N-dimethylmethanamide (DMF) acted both as reducing reagent and nitrogen source, requiring no additional nitrogen-containing precursors or post-treatment. The SnO2/GN exhibited a 3D hierarchical porous architecture with a large surface area (336 m(2)g(-1)), which not only effectively prevented the agglomeration of SnO2 but also facilitated fast ion and electron transport through 3D pathways. As a result, the optimized electrode with GN content of 44.23% exhibited superior rate capability (1126, 855, and 614 mAh g(-1) at 1000, 3000, and 6000 mA g(-1) respectively) and extraordinary prolonged cycling stability at high current densities (905 mAh g(-1) after 1000 cycles at 2000 mA g(-1)). Electrochemical impedance spectroscopy (EIS) and morphological study demonstrated the structural stability of the electrode. enhanced electrochemical reactivity and good structural stability of the electrode.
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