<p>The two-dimensional (2D) layered structure material was prepared by etching the precursor CaSi₂ with topological transformation. The effects of different drying methods on the morphological structure, elemental composition and electrochemical properties of siloxene samples were investigated. The results showed that the siloxene materials prepared by supercritical drying have the largest specific surface area and fast ion diffusion rate due to the reduction of interlayer stacking and aggregation. The supercritical drying protected the backbone structure of siloxene, resulting in better electrochemical properties. Siloxene-S has a specific capacitance value of 134 F g⁻¹ when the current density is 0.5 A g⁻¹. When the current density was increased to 4 A g⁻¹, the specific capacitance of Siloxene-S remained 96 F g⁻¹. The assembled Siloxene-S//AC device provided a maximum energy density of 5.89 Wh kg⁻¹ at a power density of 209.8W kg⁻¹, which confirmed that siloxene has broad application prospects as electrochemical energy storage material.</p>