Cyclic voltammetry studies of silicon–aluminum thin-film electrodes synthesized in the presence of oxygen

Effect of Si-Based Anode Lithiation on Charging Characteristics of All-Solid-State Lithium-Ion Battery

“…However, this is not the case since the mobility of the charge carriers in amorphous silicon is very low and amounts to ∼ 2.0 × 10 −8 m 2 (V•s) −1 at 300 K [26]. This value is comparable to the mobility of lithium ions in Si@O@Al 1.9 × 10 −8 cm 2 /B•c [15], while for the normal operation of the electrode the mobility of the electrons or holes must exceed the mobility of lithium by orders of magnitude. The low mobility of the charge carriers in a-Si is due to the high concentration of structural defects and dangling bonds of silicon atoms.…”

“…These molecular clusters play a very important role in lithium transport, as they increase the area of grain boundaries along which lithium diffusion occurs. In the Si@O@Al nanocomposite, the diffusion coefficient of lithium amounts to 5•10 −10 cm 2 s −1 [15]. It should be clarified that Figure 9 shows different sections of the film, because the areas exposed to the electron beam were etched faster than the neighboring areas, so their repeated study by the SEM method gave a distorted idea of the surface modification by etching.…”

“…The technological parameters of Si@O@Al deposition are given in Table 1. In [15][16][17][18], this technology and Si@O@Al's properties are described in more detail. The columnar structure of Si@O@Al promotes lithium diffusion through the entire electrode while layered structure enables a greater number of lithiation-delithiation cycles in liquid electrolytes.…”

“…The technological parameters of Si@O@Al deposition are given in Table 1. In [15][16][17][18], this technology and Si@O@Al's properties are described in more detail.…”

“…A simple way to overcome this obstacle, described in [15][16][17][18], is an artificial limitation of the capacity by the partial oxidation of silicon. This is achieved by the magnetron sputtering of silicon in an oxygen flow, resulting in the formation of the Si@O@Al nanocomposite.…”