2011 Volume 48 Issue 7 Pages 473-478
Li-ion batteries are paid attention because of its high energy density and high power. LiMnPO4 is a good candidate for a cathode material due to high potential (4.1V) and high thermal stability. However, LiMnPO4 has to be coated carbon on the surface of particles to compensate the low electron conductivity. In this study, we investigated the influence of carbon addition to LiMnPO4 particles for crystal structure and particle size changes. These characters have been measured by XRD. It can be stated that the carbon layer on the surface hinder from growing the particle size. As a result of this, the size of crystallite was smaller as compared with that of pristine LiMnPO4 particles. The sample heated at 700°C exhibited a specific capacity of 70 mAh / g at 0.2 C. This was the reason why the resistivity of the battery has become small with reducing particle size.
