Copper nanoparticles supported on Super-P carbon (Cu/Super-P) are prepared by a one-pot microwave assisted procedure and used as conductive additive in graphite anodes for lithium-ion batteries. Anodes prepared with the Cu/Super-P additive show excellent cycling stability at temperatures as low as -30°C with reversible capacities of the order of 180 mAh/g. Four-points probe DC resistance measurements of layers prepared with Cu/Super-P demonstrate that the electronic resistance decreases of about half with respect to layers prepared with pristine Super-P. Additionally, the ac-impedance of Cu-modified electrodes is much lower than that of electrodes containing Super-P only. This implies an active role of the copper nanoparticles in improving the intercalation capacity, especially at low temperature.
A Newly Designed Cu/Super-P Composite for the Improvement of Low-temperature Performances of Graphite Anodes for Lithium-Ion Batteries
NOBILI, Francesco;TOSSICI, Roberto;MARASSI, Roberto
2013-01-01
Abstract
Copper nanoparticles supported on Super-P carbon (Cu/Super-P) are prepared by a one-pot microwave assisted procedure and used as conductive additive in graphite anodes for lithium-ion batteries. Anodes prepared with the Cu/Super-P additive show excellent cycling stability at temperatures as low as -30°C with reversible capacities of the order of 180 mAh/g. Four-points probe DC resistance measurements of layers prepared with Cu/Super-P demonstrate that the electronic resistance decreases of about half with respect to layers prepared with pristine Super-P. Additionally, the ac-impedance of Cu-modified electrodes is much lower than that of electrodes containing Super-P only. This implies an active role of the copper nanoparticles in improving the intercalation capacity, especially at low temperature.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
