1 research outputs found
Silicon/Carbon Nanotube/BaTiO<sub>3</sub> Nanocomposite Anode: Evidence for Enhanced Lithium-Ion Mobility Induced by the Local Piezoelectric Potential
We report on the synergetic effects
of silicon (Si) and BaTiO<sub>3</sub> (BTO) for applications as the
anode of Li-ion batteries.
The large expansion of Si during lithiation was exploited as an energy
source <i>via</i> piezoelectric BTO nanoparticles. Si and
BTO nanoparticles were dispersed in a matrix consisting of multiwalled
carbon nanotubes (CNTs) using a high-energy ball-milling process.
The mechanical stress resulting from the expansion of Si was transferred <i>via</i> the CNT matrix to the BTO, which can be poled, so that
a piezoelectric potential is generated. We found that this local piezoelectric
potential can improve the electrochemical performance of the Si/CNT/BTO
nanocomposite anodes. Experimental measurements and simulation results
support the increased mobility of Li-ions due to the local piezoelectric
potential