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Tailoring high Na content in P2-type layered oxide cathodes via CuLi dual doping for sodium-ion batteries

Publication Type : Journal

Publisher : Elsevier

Source : Journal of Energy Storage

Url : https://www.sciencedirect.com/science/article/pii/S2352152X23016882?casa_token=KzbsMNVB00kAAAAA:JKCtaer2o0074HGm5mN1VMR19tpEUlXwIi_walgAVuL2cZZUc2FfiZLQY-liwSnklj52j_7RF5U

Campus : Kochi

School : Center for Nanosciences, School of Nanosciences

Center : Nanosciences

Year : 2023

Abstract : P2 and O3-type sodium layered oxides (NaxTMO2) have been considered as most promising cathodes for sodium-ion batteries. The P2-type oxides are superior to O3 in terms of fast Na diffusion and high-rate kinetics. However, the deficient Na (x < 0.7) in the P2-structure has low initial charge capacity and it limits practical application. In addition to Na deficiency, P2-O2 phase transition and Na+/vacancy ordering degrades the performance during cycling. To address this issue, dual doping strategy can be employed, synergistic effect of the dopants can mitigate both the Na+/vacancy ordering and the P2-O2 phase transitions. Herein, effect of Lisingle bondCu dual doping in P2-type Na0.67Ni0.33Mn0.67O2 is systematically investigated. Dual doped high-Na P2-type cathode achieved high capacity ~110 mAh g−1 with a cycling stability of ~85 % even following 200 cycles. Remarkably, the voltage profile is completely changed from multiple plateaus to a slow gradient which indicates a solid-solution pathway. Li present in TM layer and the strong Cusingle bondO binding can suppress the irreversible P2-O2 phase transition. Structural analysis has ensured that there is no O2/OP4 phase formation during the charge up to 4.2 V. The present result reflects that the sufficient sodium and structural stabilization can improve the performance of P2-type cathodes.

Cite this Research Publication : Anilkumar, A., Nair, N., Nair, S.V., Baskar, S. Tailoring high Na content in P2-type layered oxide cathodes via Cu–Li dual doping for sodium-ion batteries (2023) Journal of Energy Storage, 72, 108291.

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