123rd General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2
Time 4월 19일 (금요일) 11:00~12:30
Code MAT.P-469
Subject Development of Highly Stable P2-type Kx[Ni1/3Mn2/3]O2 Cathode with Excellent Rate Characteristics for Potassium Ion Batteries
Authors Myoungho Pyo*, Dominic savio Muthu gnana theresa nathan1
Department of Printed Electronics Engineering, Suncheon National University, Korea
1Department of Printed Electronics Engineering, Sunchon National University, India
Abstract Potassium ion batteries (KIBs) have gained great attention for energy storage devices owing to the elemental abundance and the lower reduction potential of potassium ions. Layered Na2/3[Ni1/3Mn2/3]O2 has been extensively studied as cathode material for sodium ion batteries (SIBs) due to its high theoretical capacity (173 mAh g-1). Both the P3- and P2-Na2/3[Ni1/3Mn2/3]O2 were investigated for sodium ion storage, among them the P2-Na2/3[Ni1/3Mn2/3]O2 exhibited better performance than P3 compound. Therefore, in the present work, we have made an attempt to synthesize P2-K2/3[Ni1/3Mn2/3]O2 by conventional solid state route but the P2 phase was not stabilized. Consequently, we prepared P2-type Kx[Ni1/3Mn2/3]O2 cathode material from Na2/3[Ni1/3Mn2/3]O2 by an electrochemical ion exchange process. The Kx[Ni1/3Mn2/3]O2 cathode delivered a specific discharge capacity of 81 mAh g-1 at a current rate of 0.5C. The material demonstrated good rate performance with 49 mAh g-1 at 15C. The cycling stability was also superior with 86% initial capacity retention after 250 cycles. The excellent cycling stability and rate performance could be attributed to the fast K+ diffusion through the 2D framework.
E-mail dominicmuthu@gmail.com