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.

固态电池中电解质与正极之间的界面接触失效（其与循环过程中正极材料的显著体积变化相关）是电池研究中的关键挑战之一。为应对这一挑战，我们提出将两种具有相反化学膨胀系数的正极材料（LiNi0.8Mn0.1Co0.1O2与LiCoO2）复合成类核壳结构。为确定设计参数（即核直径、壳厚度），我们需了解各材料在电化学载荷下的行为特性。因此，本实验旨在通过BM01线站的原位X射线衍射（operando XRD）技术，确定相态与晶格参数随充放电速率变化的规律。通过探究不同速率下该类复合正极结构的相演化过程，研究结果将为这类新型正极材料的充放电动力学提供独特数据支撑。