Solvothermal-Induced
3D Macroscopic SnO<sub>2</sub>/Nitrogen-Doped Graphene Aerogels for
High Capacity and Long-Life
Lithium Storage
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Abstract
3D macroscopic tin
oxide/nitrogen-doped graphene frameworks (SnO<sub>2</sub>/GN) were
constructed by a novel solvothermal-induced self-assembly
process, using SnO<sub>2</sub> 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
SnO<sub>2</sub>/GN exhibited a 3D hierarchical porous architecture
with a large surface area (336 m<sup>2</sup>g<sup>‑1</sup>),
which not only effectively prevented the agglomeration of SnO<sub>2</sub> 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<sup>‑1</sup> at 1000, 3000, and 6000 mA g<sup>‑1</sup>, respectively) and extraordinary prolonged cycling stability at
high current densities (905 mAh g<sup>‑1</sup> after 1000 cycles
at 2000 mA g<sup>‑1</sup>). Electrochemical impedance spectroscopy
(EIS) and morphological study demonstrated the enhanced electrochemical
reactivity and good structural stability of the electrode