Amorphous SnCo alloy nanowires (NWs) grown inside the channels of polycarbonate membranes by potentiostatic codeposition of the two metals (SnCo-PM) were tested vs. Li by repeated galvanostatic cycles in ethylene carbonate-dimethylcarbonate - LiPF6 for their use as negative electrode in lithium ion batteries. These SnCo electrodes delivered an almost constant capacity value, near to the theoretical for an atomic ratio Li/Sn of 4.4 over more than 35 lithiation-delithiation cycles at 1C. SEM images of fresh and cycled electrodes showed that nanowires remain partially intact after repeated lithiation-delithiation cycles; indeed, several wires expanded and became porous. Results of amorphous SnCo nanowires grown inside anodic alumina membranes (SnCo-AM) are also reported. The comparison of the two types of NW electrodes demonstrates that the morphology of the SnCo-PM is more suitable than that of the SnCo-AM for electrode stability over cycling. Optimization of NW technology should thus be a promising route to enhancing the mechanical strength and durability of tin-based electrodes.
Titolo: | SnCo nanowire array as negative electrode for lithium-ion batteries |
Autore/i: | G. Ferrara; DAMEN, LIBERO; ARBIZZANI, CATIA; R. Inguanta; S. Piazza; C. Sunseri; MASTRAGOSTINO, MARINA |
Autore/i Unibo: | |
Anno: | 2011 |
Rivista: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.jpowsour.2010.09.039 |
Abstract: | Amorphous SnCo alloy nanowires (NWs) grown inside the channels of polycarbonate membranes by potentiostatic codeposition of the two metals (SnCo-PM) were tested vs. Li by repeated galvanostatic cycles in ethylene carbonate-dimethylcarbonate - LiPF6 for their use as negative electrode in lithium ion batteries. These SnCo electrodes delivered an almost constant capacity value, near to the theoretical for an atomic ratio Li/Sn of 4.4 over more than 35 lithiation-delithiation cycles at 1C. SEM images of fresh and cycled electrodes showed that nanowires remain partially intact after repeated lithiation-delithiation cycles; indeed, several wires expanded and became porous. Results of amorphous SnCo nanowires grown inside anodic alumina membranes (SnCo-AM) are also reported. The comparison of the two types of NW electrodes demonstrates that the morphology of the SnCo-PM is more suitable than that of the SnCo-AM for electrode stability over cycling. Optimization of NW technology should thus be a promising route to enhancing the mechanical strength and durability of tin-based electrodes. |
Data prodotto definitivo in UGOV: | 2013-06-12 16:10:39 |
Appare nelle tipologie: | 1.01 Articolo in rivista |