Microstructural Tuning of Si/TiFeSi2 Nanocomposite as Lithium Storage Materials by Mechanical Deformation

The role of thermal annealing on the microstructures of (Ti, Fe)-alloyed Si thin-film anodes for high-performance Li-ion batteries

“…One should note that there have been several reports on the benecial properties of the TiFeSi 2 phase as an electrically conducting and mechanically buffering material. 10,[24][25][26] Fig. 1 X-ray diffraction patterns representing the structural phase evolution in the (Ti, Fe)-alloyed Si thin-film samples annealed at the different temperatures.…”

“…Furthermore, the cyclic performance data demonstrate on average 65% coulombic efficiency (CE) during 1st cycle for all the samples annealed up to 600 C. This problem has also been observed in previous reports on Si-based anodes. 25,26 The initial low CE has been ascribed to the formation of solid electrolyte interphase (SEI) on the surface of the (Ti, Fe)-alloyed Si thin-lm anode and a local loss of electrical contact caused by volumetric variation of the anode. 23,27 Moreover, Fig.…”

Real‐Time Dilation Observation of Si‐Alloy Electrode Using Thermally Treated Poly (Amide‐Imide) as a Binder for Lithium Ion Battery

“…Si–Ti–Fe–Al alloy ribbons were produced by the graphite nozzle single roll method under an inert environment for preventing the oxidation of alloys. The resulting Si–Ti–Fe–Al alloy nanocomposite ribbons were mechanically crushed into powders …”

“…Mechanical stress caused by repeated volume changes results in the degradation of Si, as well as electrical contact loss between Si, conductive agent and current collector in the electrode, eventually showing capacity fading during cycling . To address this technical issue of Si‐based electrodes, various material strategies such as modifying the structure and composition of Si including nano‐structured Si, active Si/inactive material composites, and porous Si‐based material have been suggested.…”

Role of silicon and carbon on the structural and electrochemical properties of Si-Ni3.4Sn4-Al-C anodes for Li-ion batteries

“…Some reported intermetallics to achieve this goal are Ni 3 Sn 4 [15][16][17], Cu 6 Sn 5 [18], CoSn 2 [19,20], FeSn 2 [20], FeSi 2 [21] and NiSi 2 [22]. This approach has been successfully extended to ternary silicides such as Ti 4 Ni 4 Si 7 [23,24], TiFeSi 2 [25] and Ti 3 Si 2 C 2 [26]. Moreover, binary and ternary intermetallics have been associated to carbonaceous materials to form highly efficient multicomponent systems, such as Si/FeSi 2 /C [27] and Si/Cu 3 Si/C [28], for further improvement of both the mechanical cohesion of silicon and the electronic conductivity of the whole active material.…”