A facile and green synthesis approach to derive highly stable SiOx-hard carbon based nanocomposites for use as the anode in lithium-ion batteries†
The accomplishments of high energy and power density lithium-ion batteries (LIBs) are drawing substantial attention for commercialization in the electric vehicle and energy storage industries. Recently, silicon oxides (SiOx) have emerged as potential anode materials owing to their abundance, sustainability, and preferable electrochemical properties. However, a few attributes such as inadequate electrical conductivity, poor cycling performance, and enormous volume variation hinder the practical usage of SiOx. In this work, an efficient synthesis method has been employed to synthesise spherical SiOx/hard carbon (SOHC) nano-composites with different ratios, followed by electrochemical analysis. Furthermore, nitrogen has been doped in one of the optimized composite anodes (SOHC-N) which enhances electrochemical performance considerably. Interestingly, SOHC-N exhibits improved electrochemical performance with a significant initial specific capacity of 1398.45 mA h g−1 and remarkable capacity retention in comparison to all other electrodes. Besides, SOHC-N acquires an exceptional rate performance of 1139.3 mA h g−1 at 1000 mA g−1 and an impressive cycling stability of 1248.765 mA h g−1 for over 500 cycles. Moreover, the diffusion coefficient of the mobile species (Li+) in the SOHC-N anode material has been calculated to be 8.28 × 10−10 cm2 s−1 to 9.75 × 10−8 cm2 s−1, corresponding to an outstanding kinetic performance. These values signify excellent electrochemical behaviour for next generation LIB applications.