The development of negative permittivity materials in multifunctional applications requests expansion of their operating frequency and improvement of stability of negative permittivity. Low electron density is beneficial to reduce plasma frequency so that negative permittivity is achieved in kHz region. Negative permittivity achieved by percolating composites is restricted in practicality due to its instability nature at high temperatures.To achieve temperature-stable negative permittivity in kHz region, mono-phase La1-xBaxCoO3 ceramics were prepared, and the transition from dielectric to metal was elaborated in the perspective of electrical conductivity and negative permittivity. The plasma-like negative permittivity is attained in kHz region, which is interpreted by the collective oscillation of low electron density. The temperature-stable negative permittivity is based on the fact that the plasmonic state will not be undermined at high temperatures. In addition, zero-crossing behavior of real permittivity is observed in La0.9Ba0.1CoO3 sample, which provides a promising alternative to designing epsilon-near-zero materials. This work makes the La1-xBaxCoO3 system a source material for achieving effective negative permittivity. 

Defect-induced insulator-metal transition and negative permittivity in La1-Ba CoO3 perovskite structure

Improving the Na0.67Ni0.33Mn0.67O2 Cathode Material for High-Voltage Cyclability via Ti/Cu Codoping for Sodium-Ion Batteries

A dual-modification strategy for P2-type layered oxide via bulk Mg/Ti co-substitution and MgO surface coating for sodium ion batteries.

The demand for grid-scale energy storage devices is increasing extensively nowadays. However, existing energy storage devices, consisting of Nickel-cadmium batteries, Lithium-ion batteries, and Nickel-metal hydride batteries, cannot meet future demands due to irregular dispersal and the high price of the reserves. In this regard, sodium-ion batteries (SIBs) that utilize Na-ions in their charge storage mechanism have gained significant consideration due to price advantage and extensive dispersal of sodium reserves in the earth's crust. Due to its significant effect on the electrochemical performance, the cathode materials are considered a key component for SIBs. Up to now, Polyanionic compounds, Prussian blue analogues, Organic materials, and Layered transition metal oxides (LTMOs) have been investigated as cathode materials for SIBs. LTMOs are considered potential cathode materials for SIBs due to their feasible synthesis, excellent specific capacity, and environmental friendliness. Layered P2- and O3- types are found to be promising candidates for their use as cathode material in SIBs commercialization. This review features the current development in LTMOs (mainly P2- and O3- types) as cathode candidates for SIBs, their synthesis techniques, the present challenges faced by this technology, modification approaches to enhance the electrochemical performance, and future aspects of developing fully functional SIBs. 

Recent progress of layered structured P2- and O3- type transition metal oxides as cathode material for sodium-ion batteries

Y-doped P2-type Na0.67Ni0.33Mn0.67O2: A sodium-ion battery cathode with fast charging and enhanced cyclic performance

Insights into the Ti4+ doping in P2-type Na0.67Ni0.33Mn0.52Ti0.15O2 for enhanced performance of sodium-ion batteries

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Insights into the Ti4+ doping in P2-type Na0.67Ni0.33Mn0.52Ti0.15O2 for enhanced performance of sodium-ion batteries