The strategies of the intermetallic compounds and of morphological conversion toward nanomaterials to buffer the volume changes during the lithiation/delithiation processes in lithium-metal alloys, although beneficial, have been not conclusive to overcome this drawback. To improve the cyclability performance of nanometric lithium-metal alloys we regarded the electrode materials as a whole with the current collector and we focused our efforts on the carbon paper (CP) as an alternative substrate-current collector to the conventional copper. The CP, with its three-dimensional interconnected conductive fibers, was able to host the metals and intermetallic materials and to guarantee a good electric contact without addition of carbon as conducting agent, providing a significantly improved cycling stability of these electrodes as shown in Figure 1. To get an insight into the effective role of CP on the cycling stability of lithium-metal alloy/CP electrodes we compared the electrochemical and structural behavior over repeated lithiation/delithiation cycles of different types of tin-based materials on CP such as Sn, Cu6Sn5 and Sn2Mn and the results of this study are presented and discussed in this contribution.
The role of carbon paper as current collector-substrate in tin-based anodes for lithium-ion batteries
ARBIZZANI, CATIA;MASTRAGOSTINO, MARINA
2005
Abstract
The strategies of the intermetallic compounds and of morphological conversion toward nanomaterials to buffer the volume changes during the lithiation/delithiation processes in lithium-metal alloys, although beneficial, have been not conclusive to overcome this drawback. To improve the cyclability performance of nanometric lithium-metal alloys we regarded the electrode materials as a whole with the current collector and we focused our efforts on the carbon paper (CP) as an alternative substrate-current collector to the conventional copper. The CP, with its three-dimensional interconnected conductive fibers, was able to host the metals and intermetallic materials and to guarantee a good electric contact without addition of carbon as conducting agent, providing a significantly improved cycling stability of these electrodes as shown in Figure 1. To get an insight into the effective role of CP on the cycling stability of lithium-metal alloy/CP electrodes we compared the electrochemical and structural behavior over repeated lithiation/delithiation cycles of different types of tin-based materials on CP such as Sn, Cu6Sn5 and Sn2Mn and the results of this study are presented and discussed in this contribution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
