Layered Ni-rich lithiated metal oxides such as LiNi0.8Mn0.1Co0.1O2 (NMC811) are attractive candidates as next-generation Li-battery (LiB) positive electrode materials due to their high capacities and reasonable price. Unfortunately, the cycle life of these materials is relatively short due to structural instability. However, the loss in performance over time can be retarded by either bulk or surface Zr-doping. The goal of this experiment is to perform in-operando HE-XRD on different Zr-doped and undoped electrodes in aged assembled Swagelok cells to understand the exact role and behavior of the dopant in the host NMC structure after 100 cycles.