Surface modification of Nb2O5-doped Li4Ti5O12 anode materials by atmospheric Ti(III) reduction

Title
Surface modification of Nb2O5-doped Li4Ti5O12 anode materials by atmospheric Ti(III) reduction
Authors
김슬기최선희김주선문주호
Issue Date
2013-05
Publisher
E-MRS
Abstract
The effects of atmospheric annealing on electrochemical performance for Nb2O5-doped Li4Ti5O12 anode materials have been investigated. The annealing in Ar atmosphere of Nb2O5-doped Li4Ti5O12 suppressed the capacity fade at high rate of charge-discharge condition by virtue of the enhanced exchange reaction at electrode/electrolyte interface. Under reducing conditions the surface of Nb2O5 doped Li4Ti5O12 was primarily reduced to increase the density of Ti3+ ion which contributes to expand Li4Ti5O12 lattice. Such microstructural and electrical modification at Li4Ti5O12 surface decreased the polarization resistance for exchange reaction at electrode/electrolyte interface in case of combined doping and annealing. We demonstrated the general recipe which is annealing in Ar atmosphere is used for decreasing the resistance of exchange reaction by intrinsic surface modification.
URI
http://pubs.kist.re.kr/handle/201004/45042
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KIST Publication > Conference Paper
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