Operando Observation of Phase Evaluation of Core-shell-like Cathode Composites under Electrochemical Load

The loss of intermediate contact between the electrolyte and cathode in solid-state batteries, associated with the significant volume change of cathode materials during cycling, belongs to the key challenges in battery research. To overcome this challenge, we propose to combine two cathodes having opposite chemical expansion coefficients (LiNi0.8Mn0.1Co0.1O2 with LiCoO2) in a core-shell like structure. To identify the design parameter (i.e., core diameter, shell thickness), we need to understand how the individual materials behave under electrochemical loads. The aim of this experiment is, therefore, to identify the changes in phases and lattice parameter as a function of the charge/discharge rate by using operando XRD at BM01. The results will provide unique data on the charge-/discharge kinetics in this new type of cathode materials by probing the phase evolutions of this different cathode architectures under different rates.