Synthesis Methods Of Lithium-ion Battery Cathode Material Limnpo₄

In this paper, the development of cathode materials for lithium ion batteries was revieved in detail. In particular, we performed a comparison between LiMnPO4 and LiMnPO4, and tried to synthesize LiMnPO4 both in solid state reaction and poliyol ways.Due to higher operating voltage, low cost, environmentally friendly features, Olivine-type cathode materials was considered promising matrerals. However, these materials have a low electronic and ionic conductivity of MPO4 (M=transition metal) leading to the poor ratecapability. In order to struggle against this issue, immensetechnical efforts have been directed to form well dispersed and small particles as well as to coat them with conductive materials.LiMnP04 was prepared though solid state reaction and polyol methed. XRD analysis showed that the sample obtained by solid state methed heated to 800℃to obtain the pure phase of LiMnPO4,600℃samples with a small amount of miscellaneous,400℃miscellaneous obvious phase, and the liquid has a strong diffraction peak at the end of the back may be particles are too small.Lead to increased diffusion path of lithium ion, thus affecting the electrochemical performance.On the synthesis of LiMnPO4600℃, charge and discharge tests, the results show that the material can be reversible charge and discharge, and the initial discharge capacity of about 100mAh/g, but the sample of high-rate discharge performance is poor, cycling capacity fading fast and the performance to be increase. The electrochemical reaction resistance increases with the deintercalation of lithium ions, which indicates that electrochemical reaction occurring at the interface is enhanced with more lithium ions occupying in the materials.