Figure 2. In situ SEM images of a Si microparticle anode during the 1st charge/discharge process.

(a) The charge/discharge curves of a Si microparticle anode recorded in constant current and constant voltage (CC/CV) mode with cut-off voltages ranging between −3.88 V and −2.40 V (vs. LiCoO₂). The CC rates for charge and discharge were 0.12 C. (b–g) In situ SEM images of the Si microparticles. (b,e) The initial state. (c,f) After the charge process. (d,g) After the discharge process.