SIGNATURE WORK
CONFERENCE & EXHIBITION 2024

In recent times, there has been extensive research focused on investigating the properties of Na2Co2TeO6 (NCTO), a honeycomb layered oxide. Promising indications suggest its potential as a host for a quantum spin liquid (QSL), establishing its relevance in modern technological advancements. A key inquiry revolves around NCTO’s exclusively low-energy excitations and its potential application in next-generation energy storage, especially rechargeable batteries.

 

This study conducts a comprehensive examination of the impact of the Co/Ni ratio on Na2Co2-xNixTeO6 (with Ni ranging from x = 0 to 1.0). The investigation encompasses a thorough exploration of structural, morphological, magnetic, and electrochemical characteristics. Our findings reveal the optimal Co/Ni ratio for use as a cathode material in sodium batteries. The sodium layered oxides were synthesized using a solid-state methodology.

 

Detailed structural analysis and scanning electron microscopy (SEM) consistently confirm the hexagonal crystal structure with a pure phase across all polycrystalline samples. The introduction of Ni through substitution induces noticeable alterations in sample morphology. Additionally, the sodium extraction/intercalation processes within Na2Co2-xNixTeO6 unveil distinctive anodic and cathodic peaks, corresponding to voltage plateaus during charging and discharging cycles. The first plateau signifies the orderly extraction of 1/3 of the sodium ions per formula unit, while the second marks