| Abstract Scope |
An olivine-type high-voltage cathode material, LiCoPO4, was synthesized using polymeric steric entrapment method. The synthesis procedure was modified to develop a conductive carbon coating on the active material in-situ, in a one-step process. The powders were characterized for their phase composition, particle size distribution, and surface area. The in-situ carbon-coated powders had ≈ 3% carbon by weight, with an IG/ID ratio of 0.75 as confirmed with Raman spectroscopy. The effectiveness of this approach was evaluated by comparing the electrochemical performance in half-cell configuration prepared with cathodes processed using these two oxide powders. Results from comprehensive cyclic-voltammetry, galvanostatic cycling and EIS studies showed that the in-situ carbon-coated powders had no adverse effects on the cathode performance. In addition, results from post-mortem XRD analysis of galvanostatically cycled cathodes will also be discussed to explain the observed coulombic efficiency. |