d$E$/d$x$ of the positive lepton versus the negative one, as measured by the TPC for J/$\psi$ candidates in the ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}} } = 2.76$ TeV in the invariant mass range $2.8< M_{\rm inv}< 3.2$ GeV/$c^{2}$ and $-0.9< \eta< 0.9$. Muon pairs and electron pairs are clearly separated, with the latter showing higher d$E$/d$x$ values.