A comparative study of the reduction of TiS 2 in diverse electrolyte formulations involving Ca(BF 4 ) 2 and Ca(TFSI) 2 salts was carried out at different temperatures (from 25 °C to 100 °C). While for the former salt intercalation of calcium is only observed at high temperatures, calcium intercalated phases are also observed for the latter even at room temperature. The nature of the electrolyte does also have an impact on the relative amounts of the phases formed. Since Ca(TFSI) 2 based electrolytes do not enable …

Layered CaTaN₂ and MgTa₂N₃ and cubic Mg₂Ta₂N₄ were prepared by direct solid state reaction from the binary nitrides Ta₃N₅ and A₃N₂ (A: Mg, Ca). CaTaN₂ showed a slight Ca deficiency (0.11 moles per formula), and a monoclinic distortion from previously reported <i>R</i>3̅<i>m</i> symmetry, with space group <i>C</i>2/<i>m</i> and cell parameters <i>a</i> = 5.4011(2), <i>b</i> = 3.1434(1), <i>c</i> =…

A comparative study of the electrochemical intercalation of Ca2+ and Mg2+ in layered TiS2 using alkylcarbonate-based electrolytes is reported, and for the first time, reversible electrochemical Ca2+ insertion is proved in this compound using both X-ray diffraction and differential absorption X-ray tomography at the Ca L2 edge. Different new phases are formed upon M2+ insertion that are structurally characterized, their amount and composition being dependent on M2+ and the experimental conditions. The first phase f…

Sustainable energy storage may be achieved by using advanced lithium-ion battery configurations with high energy, low cost and environmental compatibility.

A novel, low cost, environmentally sustainable cathode combining PEO, LiCF₃SO₃ and Li₂S–C is reported for application in high-energy lithium batteries.