Abstract
This study focuses on effect of improved irreversible capacity in SiO anode. Irreversible phases such as Li4SiO4, Li2SiO3, Li2O were synthesized by a solid state reaction using a mixture composed of 70 wt% SiO powder and 10 wt% Li-powder. The mixture was mixed by homogenizer and was heated at 600 °C for 2 h in an argon atmosphere. The irreversible phases were observed by XRD, XPS and TEM. Irreversible phases-formed SiO/lithium metal coin cells (2032) were assembled in a dry room. The discharge-charge cycling was performed with cut-off voltage of 0-1.5V. The electrochemical characteristics of the irreversible phases-formed SiO anode were rationalized through impedance analysis, cycle data and voltage profile. The irreversible phases-formed SiO anode’s capacities were 1265.36 mAh g-1 (lithiation) and 1052.03 mAh g-1 (delithiation) after first cycle. The reversible capacity of irreversible phases-formed SiO /lithium metal cells was estimated 83.14% in 1st cycle. It’s larger than pristine SiO/lithium metal which has 60.08%. Figure 1
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