ausblenden:
Schlagwörter:
-
Zusammenfassung:
Different kinds of composite electrode materials containing copper boron oxide Cu3B2O6 as an active component are studied in Li-ion test cells. Cu3B2O6-based electrodes are modified by incorporating 10% w/w of either single-wall/double-wall (SW/DW), multi-wall (MW) carbon nanotubes (CNTs) or reduced graphene oxide (RGO). The studies show an increase of cycling performance for all composites in comparison to the standard mixture with 10% w/w amorphous carbon. The best improvement of specific capacity is achieved for the SW/DW CNT Cu3B2O6 composite. After 30 cycles the capacity is still over 152 mAh/g in comparison to 20 mAh/g for the standard mixture. Electrochemical impedance spectroscopy reveals a significant decrease of the resistivity of the Schottky contacts in the CNTs- and RGO- composites compared to the standard mixture. This supports the conclusion that the main mechanism for the capacity improvement is related to better electronic transport properties of the composites.
