Development of the anode for a lithium-ion battery based on nanoporous germanium formed by the implantation with silver ions

Abstract

In this work, the possibility of using a nanoporous Ge layer (p-Ge), formed by implantation with Ag+ ions on a single crystal c-Ge substrate, as an anode electrode for a lithium-ion battery was studied. For this, the ion implantation of c-Ge substrutes was carried out at an energy of E=30 keV, a current density of J=5 μA/cm2, and a dose of D=1.3·1016 ion/cm2. It was shown that the obtained spongy Ag:p-Ge layers, consisting of intertwining Ge nanowires, demonstrate a high Coulomb efficiency (>97%) after the first cycle and show up to 79.5% of reversible capacity after 1000 cycles. Keywords: nanoporous germanium, ion implantation, anod, lithium-ion battery.