The effects of atmospheric annealing on electrochemical performance for Nb2O5-doped Li4Ti5O12 anode materials have been investigated. The annealing of Nb2O 5-doped Li4Ti5O12 in Ar-gas suppressed the capacity fade, under the condition of a high charge-discharge rate, by virtue of an enhanced exchange reaction at the electrode/electrolyte interface. Under Ar-gas, Nb2O5-doped Li4Ti 5O12 was primarily reduced to increase the density of Ti3+ ions. This caused expansion of the Li4Ti 5O12 lattice, but had little impact on Li-ion diffusion into the lattice. When concurrent doping and annealing induced such compositional and electrical modification of Li4Ti5O 12, the polarization resistance of exchange reactions at the electrode/electrolyte interface decreased. Therefore, we have demonstrated that annealing in Ar-gas is capable of decreasing the resistance of exchange reactions at the electrode/electrolyte interface.
Bibliographical noteFunding Information:
This work was supported by a National Research Foundation of Korea Grant ( NRF-2010-C1AAA001-2010-0028971 ) funded by the Korean Government (MEST) .
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry