Supporting to develop the new cathode materials for high-performance Li-ion batteries

Technical part Li ion battery market is explosively growing in the world. And then, the acquisition of technologies and patents for Li ion batteries is considered as one of the important issues in the world. Economical/Industrial parts Li ion batteries have been considered as the best candidate of energy storage system for large scale application such as electric vehicles as well as small devices such as cellular phones. It is expected that Li ion battery market size grows dramatically each year. Ⅲ. Scope and Contents of Project 1. Research scope The structural information of electrode materials for ion batteries is calculated using Rietveld refinement with neutron/X-ray diffraction. Their thermal stability is measured using in situ high temperature X-ray diffraction. Ⅳ. Result of Project 1. Research results Using Rietveld refinement with neutron diffraction, we calculated Li-Ni site mixing in NCM 811 which is well known as one of the best cathode materials for Li ion batteries. Maximum entropy method (MEM) showed us the possibility of fast Li diffusion in NCM 811. And, we developed a novel cathode material Na7V3(P2O7)4 with high operation potential and excellent cyclability for the first time using Rietveld refinement with neutron/X-ray diffraction and first principle calculation.