| 초록 |
Potassium ions possess the advantages of (1) high electro-reactivity and (2) chemical similarity to lithium, thus facilitating rapid warm up of potassium ion batteries (PIBs). In addition, (3) the reduction potential of potassium/potassium ion redox couples (−2.88 V) is lower than that of lithium/lithium ion couples (−2.79 V) in carbonate-based electrolytes, indicating the enhanced energy delivery capabilities of PIBs. In this study, we report waste-induced polymeric carbons which are prepared through a feasible pyrolysis process, an anode for PIBs. The waste-induced carbons have a turbostractic microstructure consisting of potato-chip like short-range graphitic layers as a site for solvated potassium cations. The unique microstructure led to high rate capabilities and a stable cyclability over 2,000 cycles with a Coulombic efficiency of ~ 99 %, demonstrating that the waste-induced carbons can be a suitable anode material for PIBs. |
