A very high-energy synchrotron radiation source ~87 keV! was utilized for in situ sampling of the structural changes occurring in the electrodic materials of a Li-ion cell during chargedischarge cycling. The real-time evolution of their crystal lattice was obtained as a function of the degree of Li intercalation. As a result, new information on two electrodic materials, LiTi zero strain and LiNiCo oxide, both of extreme interest for generation of rechargeable batteries, was gained. The actual change of the LiTi oxide lattice parameter upon cycling was observed in greater detail than before, and provided evidence of unexpected behavior in some intervals of the cycle. In the Li NiCo sample, a new phase formed during the early stages of cycling that remained stable in the subsequent cycles was revealed.
In situ studies of electrodic materials in Li-ion cells upon cycling performed by very-high-energy x-ray diffraction
Perfetti P;Ronci F;
2001
Abstract
A very high-energy synchrotron radiation source ~87 keV! was utilized for in situ sampling of the structural changes occurring in the electrodic materials of a Li-ion cell during chargedischarge cycling. The real-time evolution of their crystal lattice was obtained as a function of the degree of Li intercalation. As a result, new information on two electrodic materials, LiTi zero strain and LiNiCo oxide, both of extreme interest for generation of rechargeable batteries, was gained. The actual change of the LiTi oxide lattice parameter upon cycling was observed in greater detail than before, and provided evidence of unexpected behavior in some intervals of the cycle. In the Li NiCo sample, a new phase formed during the early stages of cycling that remained stable in the subsequent cycles was revealed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
