Abstract
The discharge capacities of 148 mAh/g (87 % theoretical value) at C/10 and 114mAh/g at 5C between 2.0 and 4.5 V at 25 °C were achieved for the carbon composite LiMn0.8Fe0.2PO4 (C-LiMn0.8Fe0.2PO4) cathode material of lithium-ion batteries (LIB), synthesized by a hydrothermal and annealing process. To improve the battery properties, we investigated the characteristics of C-LiMn1-xFexPO4 powders (x = 0.2 and 1) and the delithiated compound. While it was easier to form the homogeneous carbon layer on the surface of LiFePO4 particles from the pyrolysis of sucrose, there was a tendency to form the particulate carbon on the LiMn0.8Fe0.2PO4 particles. The lattice distortion of Mn0.8Fe0.2PO4 was revealed by electron charge density study because of the Jahn-Teller active Mn3+ ion associated with the phosphate ion. The surface and size of C- LiMn0.8Fe0.2PO4 had to be modified because of these phenomena.
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