Synthesis of Porous Bowl-like LiFePO4/C Composite with Ultrahigh Rate Capability

Boya Wang
2017 International Journal of Electrochemical Science  
Well-crystallized olivine-structure LiFePO 4 /C composite was synthesized by a wet milling-assisted spray drying using cheap Fe 3 O 4 as iron source. The composite exhibited bowl-like secondary particles that are mainly constructed of numerous carbon coated nanoparticles. Such a composite possesses a porous structure with an average pore size of 8.14 nm and a high BET surface area of 50.57 m 2 g -1 . Electrochemical tests revealed that the cathode material exhibited a high rate capability (84
more » ... te capability (84 mA h g -1 at 90 C) and good cycle stability (93% capacity retention over 500 cycles at 10 C). That is because the uniform carbon coating increased the electronic conductivity, while, large specific surface area, porous structure, and nano-sized particles greatly favored the electrolyte accessibility and rapid Li + transport.
doi:10.20964/2017.04.23 fatcat:du7cozmhwbhmdnb2zswlobyx2q