3 years ago

Interconnected CoFe2O4–Polypyrrole Nanotubes as Anode Materials for High Performance Sodium Ion Batteries

Interconnected CoFe2O4–Polypyrrole Nanotubes as Anode Materials for High Performance Sodium Ion Batteries
Qiming He, Jianhua Yang, Zhaoyin Wen, Chunhua Chen, Kun Rui
CoFe2O4-coated polypyrrole (PPy) nanotubes (CFO-PPy-NTs) with three-dimensional (3-D) interconnected networks have been prepared through a simple hydrothermal method. The application has been also studied for sodium ion batteries (SIBs). The finely crystallized CoFe2O4 nanoparticles (around 5 nm in size) are uniformly grown on the PPy nanotubes. When tested as anode materials for SIBs, the CFO-PPy-NT electrode maintains a discharge capacity of 400 mA h g–1 and a stable Coulombic efficiency of 98% after 200 cycles at 100 mA g–1. Even at a higher current density of 1000 mA g–1, the composite can still retain a discharge capacity of 220 mA h g–1 after 2000 cycles. The superior electrochemical performance could be mainly ascribed to the uniform distribution of CoFe2O4 on the 3-D matrix of PPy interconnected nanotubes, which favors the diffusion of sodium ions and electronic transportation and also buffers the large volumetric expansion during charge/discharge. Thereby our study suggests that such CFO-PPy-NTs have great potential as an anode material for SIBs.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b12503

DOI: 10.1021/acsami.7b12503

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