Back Cover Image, Volume 5, Number 5, May 2023

Back cover image: Li-rich Mn-based oxide (LMO) has been regarded as a promising candidate cathode for next-generation high energy density batteries. However, it suffers from serious electrochemical polarization at high rates, and in article number 10.1002/cey2.272, Xifei Li and coworkers reported a Prussian blue (PB) coating layer with specific redox potential, which facilitates to reduce the large polarization of electrode because of the synchronous redox reaction between coating layer and LMO. This work provides a new strategy to address the polarization issue upon various electrodes.