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Abstract New electrolytes are necessary for the development of eco-friendly and cost-effective solid-state magnesium batteries. Methylamine borane-magnesium borohydride Mg(BH4)2-CH3NH2BH3 combined with MgO is suggested as a novel solid state electrolyte. In fact, Mg(BH4)2-CH3NH2BH3 0.33–0.67 (molar fraction) is a viscous liquid at room temperature, but it can be stabilized in the solid state after the incorporation of 75 wt% of MgO. The obtained composite exhibits remarkable Mg2+ conductivity, achieving approximately 10–5 S cm-1 at 25 °C and 10–4 S cm–1 at 65 °C. Graphical abstract

Lithium-ion batteries (LIBs) are fundamental for the energetic transition necessary to contrast climate change. The characteristics of cathode active materials (CAMs) strongly influence the cell performance, so improved CAMs need to be developed. Currently, Li(Ni0.8Mn0.1Co0.1)O2 (NMC811) is state-of-the-art among the cathodic active materials. The aim of this work is the optimization of the procedure to produce NMC811: two different syntheses were investigated, the co-precipitation and the self-combustion methods. For a better understanding of the synthesis conditions, three different types of atmospheres were tested during the calcination phase: air (partially oxidizing), oxygen (totally oxidizing), and nitrogen (non-oxidizing). The synthesized oxides were characterized by X-ray Powder Diffraction (XRPD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), Inductively Coupled Plasma (ICP), and Particle Size Distribution (PSD). The most promising materials were tested in a half-cell set up to verify the electrochemical performances. The procedure followed during this study is depicted in the graphical abstract. The oxidizing atmospheric conditions turned out to be the most appropriate to produce NMC811 with good electrochemical properties.