Reversible Cation‐Mediated Anionic Redox in Defect Spinel Structure for High Power Batteries

With ever-increasing energy demand, more efforts are dedicated to designing innovative electrode materials providing higher storage capability and power output. As it has been demonstrated recently, the use of mixed cation–anion redox reactions opens up new possibilities for significant rise material's capacity unusual electrochemical characteristics lithium-ion battery electrodes. In this paper, a type fast cation-mediated anionic reaction in 3D spinel structure is presented. Li0.98K0.01Mn1.86Ni0.11O4 shows 170% stoichiometric theoretical without voltage hysteresis or fading attributed limitations reversible redox. The authors’ sol–gel-derived defect can deliver 250 mAh g−1 at 1C retain 64% under high 50C current rate. observed process reversibility unseen before cathode Li-ion systems.