20 research outputs found
Synthesis and crystal structure of the palladium oxides <tex>NaPd_{3}O_{4},</tex> and <tex>K_{3}Pd_{2}O_{4}$</tex>
Synthesis and electrochemical performance of Li2Co1−xMxPO4F (M = Fe, Mn) cathode materials
In the search for high-energy materials, novel 3D-fluorophosphates, Li2Co1−xFexPO4F and Li2Co1−xMnxPO4F, have been synthesized. X-ray diffraction and scanning electron microscopy have been applied to analyze the structural and morphological features of the prepared materials. Both systems, Li2Co1−xFexPO4F and Li2Co1−xMnxPO4F, exhibited narrow ranges of solid solutions: x ≤ 0.3 and x ≤ 0.1, respectively. The Li2Co0.9Mn0.1PO4F material demonstrated a reversible electrochemical performance with an initial discharge capacity of 75 mA·h·g−1 (current rate of C/5) upon cycling between 2.5 and 5.5 V in 1 M LiBF4/TMS electrolyte. Galvanostatic measurements along with cyclic voltammetry supported a single-phase de/intercalation mechanism in the Li2Co0.9Mn0.1PO4F material
Solving the structure of Li ion battery materials with precession electron diffraction : application to <tex>Li_{2}CoPo_{4}F$</tex>
Antisite disorder and bond valence compensation in <tex>Li_{2}FePO_{4}F$</tex> cathode for Li-Ion batteries
Antisite disorder and bond valence compensation in Li2FePO4F cathode for Li-ion batteries
New Form of Li<sub>2</sub>FePO<sub>4</sub>F as Cathode Material for Li-Ion Batteries
New Form of Li<sub>2</sub>FePO<sub>4</sub>F as Cathode
Material for Li-Ion Batterie
<tex>AVPO_{4}F$</tex> (A = Li, K) : A 4 V cathode material for high-power rechargeable batteries
Synthesis, structure and electrochemical properties of <tex>LiNaCo_{0.5}Fe_{0.5}PO_{4}F$</tex> fluoride-phosphate
Protective Spinel Coating for Li1.17Ni0.17Mn0.50Co0.17O2 Cathode for Li-Ion Batteries through Single-Source Precursor Approach
The Li1.17Ni0.17Mn0.50Co0.17O2 Li-rich NMC positive electrode (cathode) for lithium-ion batteries has been coated with nanocrystals of the LiMn1.5Co0.5O4 high-voltage spinel cathode material. The coating was applied through a single-source precursor approach by a deposition of the molecular precursor LiMn1.5Co0.5(thd)5 (thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) dissolved in diethyl ether, followed by thermal decomposition at 400 °C inair resulting in a chemically homogeneous cubic spinel. The structure and chemical composition of the coatings, deposited on the model SiO2 spheres and Li-rich NMC crystallites, were analyzed using powder X-ray diffraction, electron diffraction, high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray (EDX) mapping. The coated material containing 12 wt.% of spinel demonstrates a significantly improved first cycle Coulombic efficiency of 92% with a high first cycle discharge capacity of 290 mAhg−1. The coating also improves the capacity and voltage retention monitored over 25 galvanostatic charge–discharge cycles, although a complete suppression of the capacity and voltage fade is not achieved