Modifying SiO as a ternary composite anode material((SiOx/G/SnO2)@C) for Lithium battery with high Li-ion diffusion and lower volume expansion

Dual-Phase SiC + C Coated Microsize Si@SiOx Powder as Anode Material for Li-Ion Batteries

“…The peak value of 480−1938 cm −1 corresponds to silicon oxide, and the peak value of 520 cm −1 corresponds to Si. 39 It is obvious that the Si−O bond is generated at the same time after water grinding, and the peak value is continuously shifted to the lower wavenumber, indicating that it mainly occurs on the surface. In addition, the typical D (1347 cm −1 ) and G (1594 cm −1 ) peaks correspond to carbon in the WM-30C sample after high-temperature carbonization, except for the Si−C bond (938 cm −1 ), which indicates that Si@SiO x @SiC/C composite particles have been successfully prepared.…”

“…The Raman spectrum (Figure b) also shows similar results with XRD. The peak value of 480–1938 cm –1 corresponds to silicon oxide, and the peak value of 520 cm –1 corresponds to Si . It is obvious that the Si–O bond is generated at the same time after water grinding, and the peak value is continuously shifted to the lower wavenumber, indicating that it mainly occurs on the surface.…”

“…The D and G bands are respectively attributed to the local defect/ disorder and phonon vibration in the E2g mode, and the intensity ratio of I D /I G is 1.2, which may be due to the large number of defects/disorders in the hybrid carbon network and the corresponding high conductivity. 39,40 The chemical states of Si in these samples were further studied by XPS. The highresolution Si 2p XPS spectrum of Si can be assigned to Si 2p 1/2 and Si 2p 3/2 of the Si element.…”

“…In addition, the typical D (1347 cm –1 ) and G (1594 cm –1 ) peaks correspond to carbon in the WM-30C sample after high-temperature carbonization, except for the Si–C bond (938 cm –1 ), which indicates that Si@SiO x @SiC/C composite particles have been successfully prepared. The D and G bands are respectively attributed to the local defect/disorder and phonon vibration in the E2g mode, and the intensity ratio of I D / I G is 1.2, which may be due to the large number of defects/disorders in the hybrid carbon network and the corresponding high conductivity. , The chemical states of Si in these samples were further studied by XPS. The high-resolution Si 2p XPS spectrum of Si can be assigned to Si 2p 1/2 and Si 2p 3/2 of the Si element.…”

Effective disproportionation of SiO induced by Na2CO3 and improved cycling stability via PDA-based carbon coating as anode materials for Li-ion batteries

“…On the other hand, in the process of lithium deintercalation, the volume change of SiO may lead to the disintegration of SiO particles and the cracking of the electrode, resulting in the rapid attenuation of capacity and voltage. 4,5 The volume changes make more SiO surfaces exposed to the electrolyte, resulting in the continuous decomposition of the electrolyte on its surface and the growth of the new solid electrolyte interface (SEI). 6,7 The continuous formation of SEI films results in a relatively low coulombic efficiency, along with a large amount of irreversible Li-ion consumption.…”