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.
Highlights
Lithium-ion batteries (LIBs) are one of the most auspicious energy storage technologies for smartphones, laptops, electric hybrid vehicles, and renewable energy systems [1,2,3].LIBs consist of two electrodes called the anode and the cathode separated by an electrolyte that can be a liquid or a solid [4,5]
We report the synthesis and optical properties of LNMO, which were investigated using transient absorption spectroscopy (TAS) for the first time
The X-ray diffraction (XRD) shows that LNMO formed single phases in a disordered rocksalt structure
Summary
Lithium-ion batteries (LIBs) are one of the most auspicious energy storage technologies for smartphones, laptops, electric hybrid vehicles, and renewable energy systems [1,2,3]. There is a tendency for Li-excess cathode materials design to a rocksalt structure to be characterized by complete or partial cation disorder [11]. The revelation of Li-ion cathode cation disordered rocksalt materials opens the way to consume a huge variety of 3d and 4d metals, in addition to metals used in layered Li-rich oxides. Various lithium metal oxides with the formula LiMeO2 , where Me is one or more metal species, present the cubic rocksalt (NaCl) crystal structure. The resolving of the magnetic structure of this Li-ion battery cathode material will be advantageous to the quantitative predictions of electrochemical as well as electronic properties [19]. The stability as well as the possibility of using LNMO in both low temperatures and high magnetic field atmospheres, which may affect the electrochemistry properties of this material, are discussed
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