121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-468
Subject Effect of TM-doping ( M = Ti, Mo ) on the electrochemical performance of potassium vanadium phosphate
Authors Su Cheol Han, Sangwon park1, myoungho pyo*
Department of Printed Electronics Engineering, Suncheon National University, Korea
1Department of Chemisty, Suncheon National University, Korea
Abstract Recently, a new high voltage cathode material (KMP2O7: M = Ti, V, Mo) for KIB was proposed by fully scouring the inactivation pressure structure database. Compounds with a pyrophosphate backbone in the polyanion series are chosen because they are known to induce the highest potential for the same redox pair. This is a useful way to develop cathode materials with a possible energy density. KVP2O7 can reversibly insert / desertion 60% of K+ during C / D. KVP2O7 shows an average discharge potential of 4.2V Vs. K / K+, which corresponds to an energy density of 253 W h-1 at 0.25C. Also investigated the structural stability and K+ migration rate by doping Ti and Mo at TMO6 sites. It is expected that the electrochemical characteristics and the electrochemical behavior characteristics at high temperature will be excellent from the results previously confirmed with KTiP2O7 and KMoP2O7. Exceeds those of most cathode materials reported so far, suggesting an alternative approach to the development of new cathode materials for KIBs.
E-mail sucheol@sunchon.ac.kr