Journal Article Review Li-ion batteries Li-rich HE-NCM Ni rich Ni-rich NCM Prussian blue analogues Rietveld refinement cathode active materials cathodes electrochemical energy storage fluorite gassing behavior high annealing temperatures high-entropy materials high-entropy oxides high‐entropy PBA in situ neutron diffraction lithiation memristors non‐volatile memory perovskite resistive switching mechanism rock-salt secondary batteries sodium-ion cathodes solid state synthesis