| Enhanced Electrochemical Performance of CNTs/-Fe2O3/PPy
Composite as Anode Material for Lithium Ion Batteries |
Dawei Luo,* Jieda Wu, Yongji Ni, Chengcheng Wang and Ning Zhao
Pages : 34-40
DOI : 10.1080/0371750X.2019.1583134 |
| Abstract |
| A novel CNTs/-Fe2O3/PPy composite with three-dimensional interconnected
network structure is successfully synthesized through a solvothermal method
and in-situ polymerization. The as-synthesized CNTs/-Fe2O3/PPy composite is
characterized by scanning electron microscopy, transmission electron microscopy
and X-ray diffraction. The results indicate that spherical -Fe2O3 particles are
densely anchored onto the three-dimensional CNTs conducting network, and the
outer PPy layer deposits uniformly on the surface of -Fe2O3 particles. As an
anode material for lithium-ion battery, the CNTs/-Fe2O3/PPy composite exhibits
a high initial coulombic efficiency of 75.6%, a high specific capacity of
1095.4 mAh·g–1 at a current rate of 100 mA·g–1 after 50 cycles, as well as a good
rate capability at elevated current rates. Compared with pure -Fe2O3, the improved
Li storage property could be ascribed to the synergistic effects of -Fe2O3, CNTs
and PPy layer. This unique structure not only possesses excellent conductivity
under the joint effect of inner randomly distributed CNTs and outer coated PPy
layer, which effectively shortens the transfer paths of lithium ions and reduces
the contact resistance, but also the outer PPy protective layer prevents
agglomeration of -Fe2O3 upon continuous charging/discharging, which
withstands huge stresses caused by -Fe2O3 expansion/extraction. The
CNTs/-Fe2O3/PPy composite has the potential for use as high-performance anode
electrode for Li-ion batteries.
[Keywords: Li-ion battery, Anode, -Fe2O3, CNTs, PPy layer] |
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