  In this work, we investigate the thermodynamical behavior of charged AdS
black holes from $f(R)$ gravity corrections with a constant Ricci scalar
curvature in the grand-canonical ensemble. Using the holographic entanglement
entropy, we show that the physical observables behave as in the case of the
thermal entropy. By performing numerical computations associated with the
thermodynamical quantities versus the entanglement entropy, we confirm that the
same phase portrait persists in the holographic framework. In the
grand-canonical ensemble, the present result supports the former finding which
reveals that the charged $f(R)$ AdS black holes behave much like RN-AdS black
holes.
