Improving the electrochemical performance of lithium-ion battery using silica/carbon anode through prelithiation techniques

Abstract

This work focuses on the two most common techniques, including the direct contact method (CM) and the electrochemical method (EM) in the half-cell applied for the SiO₂/C anode. After the prelithiation process, the anodes would be assembled in the coin cells paired with NMC622 cathode. According to electrochemical performance, prelithiation techniques could strengthen the initial discharged capacity and Coulombic efficiency. While the nonprelithiated sample exhibits a poor discharged capacity of 48.43 mAh·g⁻¹ and low Coulombic efficiency of 87.41% in the first cycle, the CM and EM methods illustrated a better battery performance. Specifically, the EM4C exhibited a higher initial discharged capacity and Coulombic efficiency (137.06 mAh·g⁻¹ and 95.82%, respectively) compared to the CM30 (99.08 mAh·g⁻¹ and 93.23%, respectively). As a result, this research hopes to bring some remarkable information to improve full-cell properties using SiO₂/C as an anode material by the prelithiation method.