Konok Chandra Bhowmik, Md. Arafat Rahman, Md Muktadir Billah, Md. Saiful Islam, Sudarsan Barua
Anatase TiO 2 is a popular anode material for Li‐ion batteries (LIBs) due to its eco‐friendliness, stability, safer operation, and reversible performance. The higher costs and use of toxic chemicals in conventional chemical synthesis necessitate greener, cost‐effective methods for sustainable energy transition. Herein, a green synthesis approach was carried out to synthesize TiO 2 nanoparticles (NPs) using leaf extracts of Mangifera indica and Azadirachta indica , two widely available plants. Characterization techniques confirmed the formation of anatase TiO 2 NPs with particle sizes of 74.69 and 26.29 nm, respectively, with residual carbon and oxygen. NPs were used as anode materials of LIBs to assess their electrochemical performance at room and elevated temperature. All the anodes exhibited a stable cycling operation at both room and elevated temperature. The Mangifera indica ‐mediated anode outperforms the Azadirachta indica ‐mediated anode at room temperature. It exhibited a rate performance of 302.26, 268.49, 116.65, and 111.51 mAh g −1 at 0.1, 0.25, 0.5, and 1C, respectively. In addition, it showed a superior cycle stability and exhibited capacitance‐dominated discharge capacity of >115 mAh g −1 with an average Coulombic efficiency (CE) of ∼100% even after 450 cycles. Detailed electrochemical investigations and post‐cycling investigations indicate temperature‐mediated degradation and depict the role of residual carbon for enhancing chemo‐mechanical performance.