  In two recent papers (Phys. Rev. Lett. {\bf 116} (2016) 033201; Phys. Rev. A
{\bf 94} (2016) 032331), the possibility of continuously varying the degree of
entanglement between an elastically scattered electron and the valence electron
of an alkali target was discussed. In order to estimate how well such a scheme
may work in practice, we present results for elastic electron scattering from
lithium in the energy regime of 1$-$5~eV and the full range of scattering
angles $0^\circ - 180^\circ$. The most promising regime for Bell-correlations
in this particular collision system are energies between about 1.5 eV and 3.0
eV, in an angular range around $110^\circ \pm 10^\circ$. In addition to the
relative exchange asymmetry parameter, we present the differential cross
section that is important when estimating the count rate and hence the
feasibility of experiments using this system.
