PAni-coated LiFePO4 Synthesized by a Low Temperature Solvothermal Method
AUTOR(ES)
Fagundes, Wélique Silva, Xavier, Farlon Felipe Silva, Santana, Laiane Kalita, Azevedo, Matheus Ezequiel, Canobre, Sheila Cristina, Amaral, Fábio Augusto
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
03/12/2018
RESUMO
The composite LiFePO4/polyaniline was prepared by chemical synthesis to promote the intensification of the electrochemical properties for use as cathodes in lithium ion batteries. The X-ray diffraction (XRD) of LiFePO4 synthesized by solvothermal method were indexed to the orthorhombic structure, according to the JCPDS 40-1499. The spectra Raman and FTIR showed a high degree of ordering of LiFePO4 with interaction between LiFePO4 surface with structure conjugate of conducting polymers. The cyclic voltammogram of the composite synthesized chemically showed a significant reduction in the value of ΔE p (ΔE p = 0.20 V) when compared to LiFePO4 (ΔE p = 0.41 V), with lower charge transfer resistance values, indicating favoring electron transfer rate in the composite. Thus, the alternative synthesis route of the LiFePO4 / PAni composite was easy to handle and allowed an increase in the electrochemical properties of the LiFePO4, compared to the traditional methods that require additional thermal treatments.
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