Synthesis and Electrochemical Properties of LiMnPO₄/C Materials

A series of LiMnPO4/C materials were synthesised by taking oleic acid, glucose, graphite and stearic acid as the carbon sources separately, which used a new process, solid state reaction and the wet milling method. The structure, morphology and electrochemical properties of the materials were studied. The results show that carbon coating had no effects on olivine-type structure of LiMnPO4, and the LiMnPO4 coated with organic carbon exhibited more regular class of spherical. Additionally the LiMnPO4 coated with oil acid had a better initial discharge capacity, that the charge capacity up to 140.6 mAh·g-1 and discharge capacity up to 123.4 mAh·g-1 at 0.1 C, and the charge/discharge efficiency was 87.76%. Oleic acid coating could improve the conductivity of the material and the reversible performance of the active substances, which could inhibit the oxidation of Mn2+and grains growth, made the grains size more uniform.