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Preparation and electrochemical properties of graphene‐supported Si‐TiO 2 nanospheres as anode material for Li ‐ion batteries
Author(s) -
Wang Qiufen,
Bi Wenyan,
Miao Juan,
Lu Mengwei,
Zhang Dafeng,
Chen Yumei,
Yang Hong
Publication year - 2018
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6404
Subject(s) - graphene , materials science , anode , current density , chemical engineering , diffusion , nanocomposite , electrochemistry , sintering , particle (ecology) , nanotechnology , composite material , electrode , chemistry , physics , oceanography , quantum mechanics , geology , engineering , thermodynamics
Graphene‐supported Si‐TiO 2 (Si‐Ti‐GE) composites have been synthesized by a simple polymerization and sintering method. In the Si‐Ti‐GE composites, many small Si‐TiO 2 particles are scattered on the graphene sheet, which can mitigate the agglomeration of the material and further reduce the particle size. The initial discharge capacities of Si‐TiO 2 , Si‐Ti‐GE‐1, Si‐Ti‐GE‐2, and Si‐Ti‐GE‐3 are 336.9, 337.2, 339.8, and 356.6 mAh g −1 at the current density of 200 mA g −1 , respectively. The discharge rate capacities of TiO 2 , Si‐TiO 2 , and Si‐Ti‐GE‐3 composites retain 57.5%, 41.7%, and 82.1% at the current density from 100 to 400 mA g −1 , respectively. Therefore, the introduction of graphene not only could facilitate the Li + diffusion and electron transport but also could make better electrical conductivity.