Abstract
Lithium iron phosphate, LiFePO 4 , was synthesized by hydrothermal process and subsequently coated with carbon by the thermal decomposition of acetylene gas. The products were characterized by XRD, SEM, and TG-DTA. As-synthesized LiFePO 4 was submicron sized plate-like particle. After heating at various temperature in nitrogen atmosphere, the particle size and the crystalline sizes were grown with increasing the heating temperature. Above 700°C, the grain growth was remarkably. Carbon coating temperature was set at 500-600°C because of fine particle and good crystallinity. As a carbon raw material, acetylene gas was flowing to the as-synthesized LiFePO 4 in nitrogen atmosphere, and the LiFePO 4 /C composite was obtained. TG curves showed weight loss above 500°C, which was thought to be associated with carbon layer composition.
Highlights
LiCoO2 has been used as a cathode material for lithium ion batteries
LiFePO4 was synthesized by hydrothermal method, and the products was coated with carbon by the thermal decomposition of acetylene gas
LiFePO4 was synthesized by hydrothermal process at 200°C for 24h
Summary
LiCoO2 has been used as a cathode material for lithium ion batteries. Usage of cobalt prohibits to reduce the material costs because of scarcity. The amount of needed lithium ion battery increases significantly for the application of EV and energy storage system. The development of Co-free cathode material is quietly important. LiFePO4, is the material, in which iron having high number of Clark is rich in resources, and is inexpensive. Padhi et al reported that polyanion material like as LiFePO4 and Li2FeSiO4, showed the charge-discharge property as cathode for LIB. [1] LiFePO4 shows 3.5 V v.s. Li of reversible potential and 170 mAhg-1 of theoretical capacity. Li of reversible potential and 170 mAhg-1 of theoretical capacity These values are the energy density comparable to LiCoO2
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