Influence of oxygen content on the electrochemical behavior of SiOx@C anodes for Li-ion battery

Application of N-Doped Carbon–Silicon Oxycarbide Based on POSS Synthesis in Lithium-Ion Batteries

“…In preceding related articles, x values of 0.7−0.8 in SiO x exhibit more excellent cycle performance and magnesiothermic reduction, which are frequently used to accomplish the following reaction: SiO 1.5 + Mg → SiO x + MgO (<1.5). 22,23 Reaction-generated MgO and other byproducts like MgSiO 3 or Mg 2 SiO 4 were dissolved using 1 mol•L −1 HCl. More experimental details, measurements, and data evaluation are provided in the Supporting Information.…”

“…The subsequent calcination and magnesiothermic reduction, respectively, resulted in the complete decomposition of the imidazole ring and a relatively lower oxygen content, while the ratio of Si/O in ovi -POSS is 1:1.5. In preceding related articles, x values of 0.7–0.8 in SiO x exhibit more excellent cycle performance and magnesiothermic reduction, which are frequently used to accomplish the following reaction: SiO 1.5 + Mg → SiO x + MgO (<1.5). , Reaction-generated MgO and other byproducts like MgSiO 3 or Mg 2 SiO 4 were dissolved using 1 mol·L –1 HCl. More experimental details, measurements, and data evaluation are provided in the Supporting Information.…”

Homogenizing Silicon Domains in SiOx Anode during Cycling and Enhancing Battery Performance via Magnesium Doping

“…In the prelithiation method, the irreversible composition (SiO 2 ) is eliminated owing to the formation of lithium silicates within the SiO x and thus improves the energy density and cycle life. − However, this increases the manufacturing cost and significantly complicates the manufacturing process . As an alternative, a decrease in the oxygen stoichiometry ( x value) in SiO x is reported to enrich the active Si phase ratio and thus enhance the ICE. ,− However, the cyclability remains poor because the persistent problems of silicon anodes, such as volume expansion and crack formation, cannot be resolved. Other approaches include doping with heteroelements (e.g., Mg, Fe, and Ni) to produce electrochemically inactive phases to suppress irreversible phase formation during the first charging.…”

Restricted-magnesium-vapor-reduction of amorphous SiO/C precursors to polycrystalline Si/SiOx/C hybrid anodes

“…Nowadays, the synthesis of SiO x can be achieved through the disproportionation of SiO and SiO 2 reduction by magnesium (Mg) or carbon. 17,[21][22][23][24][25] The disproportionation of SiO is a spontaneous reaction at high temperature: (eqn (1))…”

“…Nowadays, the synthesis of SiO x can be achieved through the disproportionation of SiO and SiO 2 reduction by magnesium (Mg) or carbon. 17,21–25 The disproportionation of SiO is a spontaneous reaction at high temperature: (eqn (1))2SiO → SiO 2 + SiPartial reduction of SiO 2 can be achieved by adjusting the Mg consumption of magnesiothermic reduction. The reaction happened in the temperature range of 500–950 °C as eqn (2):SiO 2 + 2Mg → Si + 2MgOMagnesiothermic reduction possesses the potential to expand the production of porous Si-based materials.…”