Mechanochemical synthesis of pseudobinary Ti-V hydrides and their conversion reaction with Li and Na

Lithium-ion batteries (LiBs) based on insertion electrodes reach intrinsic capacity limits. Performance improvements and cost reduction require alternative reaction mechanisms novel battery chemistries such as conversion reactions sodium-ion (NaBs), respectively. We here study the formation of Ti1-xVxH2 hydrides (0 ≤ x 1) their electrochemical properties anodes in LiBs NaBs half-cells. Hydrides were synthesized by mechanochemistry metal powders under hydrogen atmosphere (PH2 ∼ 8 MPa). For V contents below 80 at. % (x < 0.8), single-phase pseudobinary dihydride compounds are formed. They crystallize fluorite-type structure highly nanostructured (crystallite size 10 nm). Their lattice parameter decreases linearly with content leading to hydride destabilization. Electrochemical studies first carried out Li-ion half cells full between lithium. The potential is gradually tuned vanadium result induced Furthermore, different paths for observed Ti-rich 0.25) V-rich ≥ 0.7) alloys. Na-ion half-cell measurements prove reactivity (V, Ti)H2 sodium, albeit significant kinetic limitations.