Harnessing Surface Carbon Coating and the Effect of Electrolyte on the Enhanced KTi ₂ (PO ₄ ) ₃ Anode Performance in Potassium‐Ion Batteries

Potassium‐ion batteries (KIBs) are a promising alternative to lithium‐ion batteries due to their abundance and low cost. KTi 2 (PO 4 ) 3 (KTP) is a NASICON‐type material with high theoretical capacity (128 mAh g −1 ) and low redox potential (1.6 V). However, it exhibits poor cycle stability and sluggish kinetics due to its low conductivity. Furthermore, selecting an appropriate electrolyte is a significant challenge in maintaining consistent electrochemical performance. To address this, KTi 2 (PO 4 ) 3 nanoparticles were synthesized using a solid‐state technique and coated with carbon KTi 2 (PO 4 ) 3 /C (KTP/C) derived from oleic acid. The conductive network improves ion transport and electrolyte infiltration. Structural and morphological investigations revealed an interconnected carbon framework. The performance of the KTP and KTP/C electrodes was evaluated using EC:DEC and EC:DMC electrolyte solvents. The initial discharge capacity of the KTP/C electrode was 80 and 90.9 mAh g −1 at 20 mA g −1 . The synergistic effects of the electrolyte composition and carbon coating resulted in an electrode exhibiting reasonable capacity retention of up to 98%. The computational methods, such as bond valance site energy(BVSE) and charge distribution analysis (CHARDI) analysis, have revealed a minimal three‐dimensional ion‐migration barrier and have evaluated electrolyte stability and solvent compatibility. Overall, this study provides new insights for enhancing the strategic development of KTP/C anodes for high‐performance K‐ion applications.