Effects of Li-doped NiO on the charge–discharge properties of LiF–NiO composites used as cathode materials for Li-ion batteries

Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries

“…Because none of the late 3d transition metals (Mn, Co, Ni, Cu, Zn) has been reported to form oxyfluorides through soft chemistry or solid-state reaction routes, 35,36 ball-milling appears to be the most efficient way to prepare such solid solution phases. [37][38][39] Fig . 1a shows X-ray diffraction (XRD) patterns obtained on the as-prepared Li(HEO)F and a mixture of pristine HEO and LiF.…”

Low‐Overpotential LiF Splitting in Lithiated Fluoride Conversion Cathode Catalyzed by Spinel Oxide

“…[ 14,15,17 ] However, in all of these previous works, the cathodes must be charged to the vicinity of 5 V in order to fully activate the reaction, whereas in this case the cutoff charge voltage is only 4.2 V, indicating the benefit of our formula to the improvement of conversion kinetics and avoiding of side reaction at ultrahigh voltage. Table S1 in the Supporting Information also shows the estimated charge capacity values of documented LiF–M x O y cathodes when they are charged to 4.2 and 4.5 V. [ 14–17,19–21 ] These comparisons further illustrate the advantage of our LiF‐spinel NiFe 2 O 4 in terms of lowering the charge voltage to reach the higher capacity utilization at lower voltage (Figure 3e). Assuming a full conversion of LiF content in 4LiF–NiFe 2 O 4 , the theoretical gravimetric capacity is 317 mAh g −1 .…”

“…Figure 4d compares the energy efficiency (EE) value of our system with those of previous LiF-M x O y based conversion systems. [14][15][16][17][19][20][21] The EE value is as high as 88.1% for our 4LiF-NiFe 2 O 4 , which is higher than those of all the other LiF-M x O y systems. Most of previous works used a rock salt or amorphized transition metal oxide as the redox host in the LiF-M x O y cathode.…”