| 초록 |
Potassium ion batteries (PIBs) are one of the most promising alternatives to substitute current lithium ion batteries (LIBs) for large-scale energy storage devices. However, much larger potassium ion leads to serious volume expansion (~61%) on graphite anode and consecutive electrolyte decomposition by forming porous organic-based solid-electrolyte-interface (SEI) layer which is induced from a typical carbonate-based electrolyte. The obstacles bring about a high irreversible capacity and continuous capacity decay, requiring a research effort to develop more stable SEI layers. Therefore, it is important to select adequate anode materials and establish state-of-the-art electrolyte systems for PIBs. Herein, we selected a hard carbon as an anode because its porous structure composed of a disordered graphitic lattice can mitigate large volume expansion during de-/potassiation process. In addition, a new electrolyte system with additive was investigated to achieve stable SEI layer formation. |
