What does the crystal lattice of a metal conductor consist of?

It has long been known that the crystal lattice of a metal conductor consists of negative and positive ions, since there are effective electrostatic forces between positive and negative ions. On a section of a circuit, this current strength is directly proportional to the voltage within this section. The main reason for the resistance of a conductor is the relationship of electrons directly with the ions of the crystal lattice, caused by their movement. This point is controversial and is considered a flaw in Ohm’s laws.