Densities of aqueous solutions of lithium tetraborate in the (0.01 to 0.12) mol.kg(-1) concentration range at a 5 K intervals from 283.15 K to 363.15 K and 101.325 kPa were measured using a precise Anton Paar Digital vibrating-tube densimeter. Apparent molar volumes are obtained on the basis of experimental density data, and then the 3D diagram of (m(i), T, V-phi) apparent molar volumes against temperature and molality were plotted. On the basis of Pitzer ion-interaction equation of the apparent molar volume model, the Pitzer single-salt parameters (beta((0)v)(M,X), beta((1)v)(M,X), beta((2)v)(M,X) and C-M,X((v))), and their temperature-dependence correlation F(i, p, T) = a(1) + a(2)T + a(3)T(2) + a(4)/T + a(5)ln(T) + a(6)/(T-263) + a(7)/(680-T) (where T is temperature in Kelvin, p is a pressure in 101.325 kPa, a(i) are model parameters) for Li2B4O7 are obtained, which is not reported in the literature. The deviations of the experimental and calculated values of Pitzer single-salt parameters beta((0)v)(M,X), beta((1)v)(M,X), beta((2)v)(M,X) and C-M,X((v)) for Li2B4O7 are all within +/- 0.1, and those results indicate that the single salt parameters and their relational coefficients of temperature-dependence for Li2B4O7 obtained in this work are reliable. (C) 2018 Elsevier Ltd.