am405557c_si_001.pdf (2.58 MB)
Solvothermal-Induced 3D Macroscopic SnO2/Nitrogen-Doped Graphene Aerogels for High Capacity and Long-Life Lithium Storage
journal contribution
posted on 2014-03-12, 00:00 authored by Ronghua Wang, Chaohe Xu, Jing Sun, Lian Gao, Heliang Yao3D macroscopic tin
oxide/nitrogen-doped graphene frameworks (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 m2g‑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 enhanced electrochemical
reactivity and good structural stability of the electrode.