Abstract:
The paper is devoted to the study of the efect of thermal annealing on the change in the structural
properties and phase composition of metal Co nanostructures, as well as the prospects of their
use as anode materials for lithium-ion batteries. During the study, a four-stage phase transition in
the structure of nanowires consisting of successive transformations of the structure (Со-FCC/CoHCP)→(Со-FCС)→(Со-FCC/СоСо2О4)→(СоСо2О4), accompanied by uniform oxidation of the structure
of nanowires with an increase in temperature above 400°C. In this case, an increase in temperature
to 700°C leads to a partial destruction of the oxide layer and surface degradation of nanostructures.
During life tests, it was found that the lifetime for oxide nanostructures exceeds 500 charge/discharge
cycles, for the initial nanostructures and annealed at a temperature of 300°С, the lifetimes are 297
and 411 cycles, respectively. The prospects of using Co/CoCo2O4 nanowires as the basis for lithium-ion
batteries is shown.
