Electrochemical properties of LiMn1.5Ni0.5O4 powders synthesized by solution combustion method: Effect of CTAB as a fuel

Toward Better Stability and Reversibility of the Mn4+/Mn2+ Double Redox Activity in Disordered Rocksalt Oxyfluoride Cathode Materials

“…However, this structure seems to be destabilized during prolonged cycling. It can be assumed that more Mn­(II) ions are activated in the structure, which makes the dissolution more pronounced . Furthermore, the beginning of the O-oxidation plateau is clearly visible for this composition, which is in agreement with previous reports, when cycling the material at high voltages .…”

“…It can be assumed that more Mn(II) ions are activated in the structure, which makes the dissolution more pronounced. 43 Furthermore, the beginning of the O-oxidation plateau is clearly visible for this composition, which is in agreement with previous reports, when cycling the material at high voltages. 2 Interestingly, the sample with 33% Ti shows the best capacity retention after 200 cycles, maintaining a discharge capacity of 136 mAh g −1 (inset of Figure 5a) with a Coulombic efficiency of around 82% and significantly smaller charge−discharge polarization (Figure 5b).…”

“…44−46 In our case, the reason behind the higher rates of capacity loss by increasing the Ti content might be the smaller particle size, which amplifies the dissolution of the corresponding entities in the electrolyte during cycling. 43 The voltage versus specific capacity circle plots for the four samples after the 2nd and 100th cycles are presented in Figure 6. At both cycle numbers, shifts in capacity, charge/discharge hysteresis, and voltage slope profiles can be found.…”

“…Lithium ion migration within particles is promoted by the presence of short diffusion pathways, and in the case of smaller particles, diffusion can be enhanced. However, in the case of the higher activity of the material, dissolution is more likely to happen. − In our case, the reason behind the higher rates of capacity loss by increasing the Ti content might be the smaller particle size, which amplifies the dissolution of the corresponding entities in the electrolyte during cycling …”