2011 Volume 48 Issue 6 Pages 389-395
LiMnPO4 is an excellent candidate for a cathode material as future Li-ion batteries because of high potential (4.1V) and high thermal stability. However, it cannot be used in practical batteries because of the poor rate property. LiMnPO4 particles were composited with the carbon to compensate low electron conductivity. In this study, we investigated the relationships between carbon composited conditions and battery properties. The carbon layer became homogeneous with an increase in milling time. Furthermore, the fine carbon, such as ketjen black, affects to form the uniform carbon layer. The sample exhibited a specific capacity of 125mAh / g at 0.05C and 70mAh / g at 5C. This result was due to the factor that the uniform carbon layer compensated the electric conductivity on the surface of LiMnPO4 particles.