A novel polyaspartate precursor method for the synthesis of LiCa_yMn_2−yO₄nanoparticles for Li-ion batteries

Abstract

Cubic spinel LiCayMn2−yO4 nanoparticles were synthesized using nitrates of Li+, Ca2+ and acetate of Mn2+ with aspartic acid as a polymerizable combustion fuel. They were dissolved in distilled water and then concentrated by heating to form a viscous resin which was transformed into a foam-like mass by drying at 120 °C. Phase pure LiCayMn2−yO4 powders were obtained by combustion of these foams. The decomposition temperature of the polyaspartate precursor was investigated by TG/DTA analysis. The structural property of the synthesized LiCayMn2−yO4 powders was confirmed by x-ray diffraction studies. The average particle size of the synthesized powders was calculated from the x-ray data using the Scherrer equation. TEM analysis was also carried out to confirm the particle size and surface morphology of the synthesized LiCayMn2−yO4 powder. Finally, electrochemical charge–discharge studies were carried out by assembling 2016 type electrochemical button cells using carbon as the anode and the synthesized LiCayMn2−yO4 as the cathode with microporous polymer electrolyte.

Low-temperature synthesis of highly crystallized LiMn2O4 from alpha manganese dioxide nanorods

“…The traditional solid-state reaction method was often used to produce single phase LiMn 2 O 4 , but it requires prolonged high temperature calcination (800 • C) owing to the low reactivity of the starting materials [3,6,7], which causes an inevitable coarsening of the powders with a broad size distribution and an oxygen deficiency, ultimately impairing the electrochemical properties of LiMn 2 O 4 [8]. As a result, a number of soft chemistry techniques have been explored to prepare LiMn 2 O 4 , such as sol-gel [9,10], Pechini process [11,12], combustion [13,14], and polymer precursor method [15]. Although uniform LiMn 2 O 4 particles with good electrochemical performance could be thus obtained, the synthetic procedures are generally complex.…”

Development of LiCr<inf>0.15</inf>Co<inf>0.85</inf>O<inf>2</inf> nanowires by electrospinning method as a cathode for asymmetric supercapacitors

“…The third exothermic peak at 450 -500°C. indicates that the compound begun to decompose at lower temperature and hence adequate heat energy has been supplied for initiating the crystallization of LiCrOlSCo08S0Z fibrous precursor sample [19]. c...;…”

Preparation and electrochemical behaviour of LiMn2O4 thin film by spray pyrolysis method

“…It suggests that the prepared LiMn 2 O 4 thin film electrode showed good cycling stability. It may be due to the less porous nature of the prepared thin film electrode material than the bulk electrode material [16]. Hence, the spray pyrolysis method can be used for the preparation of active LiMn 2 O 4 thin film electrode material.…”