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|
| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Exhibition Hall 2 |
| Time |
4월 19일 (금요일) 11:00~12:30 |
| Code |
MAT.P-451 |
| Subject |
Calcium storage in graphite anode and organic cathode: Implementation in a rocking chair type calcium ion battery |
| Authors |
Prabakar Richard, Myoungho Pyo*
Department of Printed Electronics Engineering, Suncheon National University, Korea
|
| Abstract |
Despite significant improvement in electrolyte systems during the past few decades, divalent ion (Mg2+ and Ca2+) batteries still suffer from electrolyte-incompatibility with metallic anodes. We propose graphite as a reliable Ca2+-intercalation anode in tetraglyme (G4). When charged (reduced), graphite accommodates solvated Ca2+-ions (Ca-G4) through intercalation and delivers a reversible capacity of 62 mAh g-1 forming a ternary intercalation compound, Ca-G4·C72. Mass/volume changes during Ca-G4 intercalation and the evolution of in-operando X-ray diffraction studies both suggest that Ca-G4 intercalation results in the formation of an intermediate phase between stage-III and stage-II with a gallery height of 11.41 Å. Density-functional-theory calculations also reveal that the most stable conformation of Ca-G4 has a planar structure with Ca2+ surrounded by G4, which eventually forms a double stack that aligns with graphene layers after intercalation. Despite large dimensional changes during charge/discharge (C/D), both rate performance and cyclic stability are excellent. Graphite retains a substantial capacity at high C/D rates and shows no capacity decay during as many as 2000 C/D cycles. As the first prototype Ca2+-shuttling calcium-ion batteries (CIBs), a full-cell consisting of a Ca2+-loaded graphite anode and an organic cathode is also constructed, and its electrochemical performance is presented. We hope that this work helps pave the way for the development of commercially viable CIBs. |
| E-mail |
richiechem@gmail.com |
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123rd General Meeting of the KCS