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Olivine-structured lithium iron phosphates are promising cathode materials in the development of high power
lithium ion batteries for electric vehicles. However, the low electronic conductivity and ionic conductivity of lithium iron
phosphates hinder their commercialization pace. This work aims to verify the approaches for improving the
electrochemical properties of lithium iron phosphates. In this work, sol-gel method was used to synthesize carbon coated
lithium iron phosphates and nickel doped lithium iron phosphates, and their particle sizes were controlled in the
nanometer to sub-micrometer range. The crystalline structures of the synthesized lithium iron phosphates were
characterized by X-ray diffraction, and their morphologies were analyzed by scanning electron microscopy. To study
their electrochemical properties, prototype lithium ion batteries were assembled with the synthesized lithium iron
phosphates as cathode active materials, and with lithium metal discs as the anodes, and the discharge / charge properties
and cycling behaviors of the prototype batteries were tested at different rates. The synthesized lithium iron phosphate
materials exhibited high capacity and high cycling stability. It was confirmed that particle size reduction, carbon coating
and metal doping are three effective approaches for increasing the conductivity of lithium iron phosphates, and thus
improving their electrochemical properties. Experimental results show that by combing the three approaches for
improving the electrochemical properties, lithium iron phosphate composites with characteristics favorable for their
applications in lithium ion batteries for electric vehicles can be developed, including high specific capacity, high rate
capacity, flat discharge voltage plateau and high retention ratio.
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