Abstract <p>In this work, anode materials based on silicon–graphite composites with silicon mass fractions of 20, 50, and 80 wt % were investigated. The structural, morphological, and electrochemical characteristics of the composites, as well as the features of their degradation under different lithiation regimes were examined using X‑ray diffraction, scanning electron microscopy, liquid porosimetry, cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic cycling. Increasing the silicon content leads to an increase in the porosity of the electrode active layer and the anode capacity, which is due to the high electrochemical capacity of silicon. Coulometric capacity limitation (1000 mA h/g) does not prevent degradation of the composites because of the progressive deepening of silicon lithiation and the formation of a crystalline Li_3.75Si phase, causing a sharp capacity drop. In contrast, applying a potentiostatic lithiation cut‑off (170–190 mV) limits lithiation to the amorphous silicon layer, preserving the crystalline core and significantly improving cycling stability. The best cycling stability was achieved for the composite containing 20 wt % silicon (capacity loss of 6% over 100 cycles). Meanwhile, the composite with 80 wt % Si delivers the highest specific capacity after 100th cycle (484 mA h/g).</p>