Effect of the Mg-substitution on the graphitic carbon foams—LiNi1−yMgyPO4 composites as possible cathodes materials for 5V applications

Optimization of dielectric heating parameters in the production of high‐voltage LiNiPO4‐core and carbon‐shell ceramics

“…The formation of this side phase can be explained by the carbothermal reduction in the phosphate at the grain boundaries of the LiNiPO 4 crystal phase when a certain critical temperature is reached and held at that temperature for a long time. 31 If the main calcination parameters are assumed to be the same for all samples, it is possible to explain minor differences in the peak intensities of the N 3 P impurity phase by recourse to differences in the solvothermal reaction temperatures and microwave exposure times, although the calcination parameters are the same for all nine powders. It is noteworthy that the LNP@C samples produced at 200°C, which is the highest solvothermal synthesis temperature, exhibit impurity peak intensities at the highest levels.…”

Influence of gradual cobalt substitution on lithium nickel phosphate nano-scale composites for high voltage applications

“…However, it is interesting that the intensity of the impurity phase Ni 3 P decreases as the substituted cobalt content in the structure increases. The formation of this phase specifies that extensive carbothermal reduction of the phosphate starts prior to reaching this temperature, possibly at the grain boundaries of the LiNiPO 4 crystalline phase [34,35]. Moreover, the results reveal that the introduction of the Co 2+ ions into the initial composition does not affect the structure of the LiNiPO 4 phase and seem to increase its stability in terms of thermodynamic conditions.…”

Polyanionic Compounds as Cathode Materials

“…The voltammetry displayed an oxidation peak at~5.3 V and a reduction peak at~5.1 V. Recently, Jaegermann et al [195,196] have reported the preparation of LNP and LCP by a Pechini assisted sol-gel process that provides material exhibiting redox peaks at~5.2 and~4.9 V vs. Li 0 /Li + . Mg-substituted LNP/graphitic carbon foams composite was also synthesized by the same method, which delivered a discharge capacity of 126 mAh g À1 at C/10 rate when substituting 0.2 Mg for Ni [197].…”