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Microwave-assisted synthesis and surface decoration of LiFePO4 hexagonal nanoplates for lithium-ion batteries with excellent electrochemical performance
Ist Teil von
Journal of materials science, 2017-02, Vol.52 (3), p.1590-1602
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2017
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Microwave-assisted synthesis of electrode materials for lithium-ion batteries has drawn extensive attention owing to the unique microwave dielectric heating. In this work, olivine LiFePO
4
hexagonal nanoplates, with a short
b
-axis, were successfully synthesized using a single-mode microwave-assisted hydrothermal system at 160 °C just in 20 min. Microwave irradiation can lower the synthesis temperature and shorten the synthesis time dramatically. The growth process of LiFePO
4
hexagonal nanoplates with microwave irradiation time was investigated. The role of electromagnetic field in the formation and the quality of the resulting LiFePO
4
were explored. In order to enhance the electrochemical properties of LiFePO
4
hexagonal nanoplates, LiFePO
4
/C and LiFePO
4
/rGO have been obtained through surface decoration of LiFePO
4
nanoplates by ex situ carbon coating and in situ reduced graphene oxide (rGO) coating. The electrochemical analysis demonstrated that LiFePO
4
/rGO had more excellent electrochemical performance; the initial discharge capacity at 0.1 C was up to 167.2 mAh g
−1
which was very close to the theoretical value (170 mAh g
−1
). This is because the in situ coating can achieve a complete coating of the surface and rGO has a higher electrical conductivity. The rGO layer can boost the transport speed of the lithium ions and electrons, and reduce the charge transfer resistance of Li ion insertion/extraction. Furthermore, the unique structure of the nanoplates with a short
b
-axis is favored to shorten the migration of Li
+
ion.