We present the measurement of azimuthal anisotropy in the distributions of deuteron ( d ), anti-deuteron ( d ¯ ) , triton ( t ) and helium ( 3 He) nuclei produced at midrapidity ( | η | < 1.0 ) in heavy-ion collisions at s NN = 200 , 62.4 , 39 , 27 , 19.6 , 11.5 and 7.7 GeV . We also present systematic study of the difference between particle and anti-particle elliptic flow ( Δ v 2 ) for identified hadrons ( π ± , K ± , p , p ¯ , Λ , Λ ¯ and Ξ ± ) at mid-rapidity for Au+Au collisions at RHIC Beam Energy Scan (BES) energies. Elliptic flow coefficient v 2 of nuclei has been compared with those for p , p ¯ . We observe mass ordering in nuclei v 2 ( p T ) for low transverse momenta ( p T < 2.0 GeV / c ) and a clear centrality dependence. The triton and helium, having almost the same mass, show similar magnitude of v 2 within the available event statistics. Mass number ( A ) scaling of nuclei v 2 ( p T ) has been observed, which indicates the possibility of coalescence mechanism to be the underlying physics behind nuclei formation in heavy ion collisions. New results on Δ v 2 for all particles, studied in 10–40% centrality, show similar trend as was observed for minimum bias (0–80%) events. The proton and anti-proton Δ v 2 for three different collision centralities is presented as a function of s NN .