Synthesis, Optical, Magnetic and Thermodynamic Properties of Rocksalt Li1.3Nb0.3Mn0.4O2 Cathode Material for Li-Ion Batteries

Abstract

Since the discovery of the reversible intercalation of lithium-ion materials associated with promising electrochemical properties, lithium-containing materials have attracted attention in the research and development of effective cathode materials for lithium-ion batteries. Despite various studies on synthesis, and electrochemical properties of lithium-based materials, fairly little fundamental optical and thermodynamic studies are available in the literature. Here, we report on the structure, optical, magnetic, and thermodynamic properties of Li-excess disordered rocksalt, Li1.3Nb0.3Mn0.4O2 (LNMO) which was comprehensively studied using powder X-ray diffraction, transient absorption spectroscopy, magnetic susceptibility, and low-temperature heat capacity measurements. Charge carrier dynamics and electron–phonon coupling in LNMO were studied using ultra-fast laser spectroscopy. Magnetic susceptibility and specific heat data are consistent with the onset of long-range antiferromagnetic order at the Néel temperatures of 6.5 (1.5) K. The effective magnetic moment of LNMO is found to be 3.60 μB. The temperature dependence of the inverse magnetic susceptibility follows the Curie–Weiss law in the high-temperature region and shows negative values of the Weiss temperature 52 K (3), confirming the strong AFM interactions.

Thermal and dielectric properties of disordered rocksalt Li-excess Li1.3Nb0.3Mn0.4O2 cathode material for lithium-ion batteries

“…The structure of the polycrystalline LNMO sample has a disordered structure with the space group Fm-3m (number 225) as reported previously by Kamel et al [20]. Fig.…”

“…The synthesis of the LNMO was previously reported [20,22]. For the dielectric measurements, the as-prepared LNMO powder sample is pressed using a hydraulic press at about 3 tons into a round pellet of diameter and thickness of 1 cm and 2.7 mm, respectively.…”

“…The output high capacity refers to applying a Mn 2+ /Mn 4+ redox couple that utilizes a redox reaction of two electrons (2e − ) [12,19]. Recently, Kamel et al [20] reported the optical, magnetic, and thermodynamic properties of this compound.…”

Impact of gadolinium doping into the frustrated antiferromagnetic lithium manganese oxide spinel

“…The magnetic field of these doped LMO is controlled by factors like dopant metals particle size, morphology, distribution in spinel lattice, dispersion and synthesis pathway, etc. 30 , 31 , 32 A study on magnetic phase transitions of this material could give more insights into a deep understanding of material behavior toward electrochemical application. Herein, we report a low-temperature magnetic study of Gd 3+ ion-doped LMO at 5K and 300K using zero-field-cooled (ZFC) and field-cooled (FC) techniques and the effect of 4f-3d interactions, transition, and rare earth metals.…”