Fabrication of a Dual-ion Intercalation Cell Composing of a Graphite Cathode (MCMB) and a TiO₂(B) Anode

摘要

A novel ion intercalation cell was fabricated using a MCMB cathode and a TiO2(B) anode whichdelivers 142 Wh Kg-1 .0 V. During the chargingprocess, the ceiling potential of cathode reaches to 5.4 V while the bottom potential of anode dropsdown to 1.4 V Vs Li/Li+. The average working voltage of this device is 3.1 V which is significantlyhigher than that of other hybrid capacitors. The better rate performance of the fabricated cell mainlyattribute to the structural features of TiO2(B) electrode due to fast lithium insertion/de-insertionprocesses through the open channel parallel to the b-axis of TiO2(B). The ion intercalation mechanismis discussed using 4-electrode cell and ex-situ XRD data. XRD data revealed that peak position ofMCMB does not fully come back to its original position after first charge/discharge process of the cellindicating structural changes of the graphite cathode. The fabricated cell is inherently safer thanlithium ion batteries especially at low temperate and at high charge discharge rates.