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The suitability of multication doping to stabilize the disordered Fd 3̅ m structure in a spinel is reported here. In this work, LiNi 0.3 Cu 0.1 Fe 0.2 Mn 1.4 O 4 was synthesized via a sol-gel route at a calcination temperature of 850 °C. LiNi 0.3 Cu 0.1 Fe 0.2 Mn 1.4 O 4 is evaluated as positive electrode material in a voltage range between 3.5 and 5.3 V (vs Li + /Li) with an initial specific discharge capacity of 126 mAh g -1 at a rate of C /2. This material shows good cycling stability with a capacity retention of 89% after 200 cycles and an excellent rate capability with the discharge capacity reaching 78 mAh g -1 at a rate of 20 C . In operando X-ray diffraction (XRD) measurements with a laboratory X-ray source between 3.5 and 5.3 V at a rate of C /10 reveal that the (de)lithiation occurs via a solid-solution mechanism where a local variation of lithium content is observed. A simplified estimation based on the in operando XRD analysis suggests that around 17-31 mAh g -1 of discharge capacity in the first cycle is used for a reductive parasitic reaction, hindering a full lithiation of the positive electrode at the end of the first discharge.

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Synthesis and Characterization of a Multication Doped Mn Spinel, LiNi0.3Cu0.1Fe0.2Mn1.4O4, as 5 V Positive Electrode Material