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 rates, and in article number 10.1002/cey2.272, Xifei Li coworkers reported Prussian blue (PB) coating layer with specific redox potential, which facilitates to reduce the large of ele...