NaMoO2PO4 glass ceramic nanocomposite as a novel cathode material for magnesium-ion batteries

Unlocking superior Mg-ion cells with good cycling performance as a future battery candidate is now crucial. However, structural instability is mainly reported in current oxide frameworks. Additionally, poor diffusion kinetics are typical due to the affinity of Mg2+ ions to interact with oxide anions. Herein, NMoP-0 glass was obtained according to the molar ratio 20 Na2S to 40 MoO3-40 P2O5 mol%. NMoP-0 was thermally treated to obtain NMoP-8 and NMoP-12 glass ceramic nanocomposites (GCN) to obtain the desired NaMoO2PO4. XRD identified the crystal structure of NMoP-12 to be NaMoO2PO4 with a crystallite size of 38 nm. The electrodes were tested by EIS, CV, and GCD in three and two electrode systems, both confirming their reversible electrochemical activity. The initial specific capacitance values of NMoP-0, NMoP-8, and NMoP-12 in Mg-ion cells were estimated to be 214, 82, and 130 mAh g(-1), respectively. Meanwhile, the NMoP-12 cells showed the best capacity retention behavior and a diffusion coefficient similar to 10(-14), which means that Mg2+ ion diffusion in NMoP-12 is moderately favorable. This promising performance of NaMoO2PO4 GCN suggests its potential as a novel cathode material for magnesium-ion batteries, sparking hope for future advancements in battery technology.