The Alpha Magnetic Spectrometer 02 (AMS-02) is a particle physics detector that was installed on the International Space Station in May 2011. Among its main science goals, AMS-02 will perform an accurate measurement of cosmic ray nuclei fluxes. Nuclei are identified by the redundant measurement of their absolute electric charge. The AMS-02 silicon tracker offers nine such independent measurements. The tracker response is naturally degraded by a number of effects that must be carefully taken into account such as to optimize the tracker performances in terms of nuclei identification. A detailed calibration procedure has been developed, resulting in a significant improvement of the nuclei identification power. The excellent performance of the tracker, combined to the measurement of the particle magnetic rigidity, naturally lead to an analysis of the differential fluxes of cosmic ray nuclei in a range of energy between few GeV up to about 1 TeV.