Operando XAS/XRD study of mixed d-metal olivines as a new cathode materials for modern Li-ion batteriesFrom 27.06.2018 till 03.07.2018 08:00:00
We propose to perform a combined XAS/XRD in operando study of mixed d-metal olivines with a general formula LixFe1-yMyPO4, where M = Co, Mn, etc. Those materials are considered as promising cathodes for Li-ion batteries, showing a theoretical reversible capacity of 170 mAh/g and better cycling performance and stability than present commercial cathodes based on non-doped LiFePO4 olivines. Preliminary experiments have shown that olivines, doped by different d-metals and synthesized in with different methods and conditions, differs in their electrochemical properties as well. We propose to study the reaction mechanism by means of in operando d-metal K-edge XAS in combination with XRD techniques to gain reliable information about atomic and electronic structure of metal atoms at different stages during cycling. This will allow us to correlate the subtle nuances of material performance as a cathode with particularities of synthesis method in order to improve the characteristics of this material for future uses.