期刊
CERAMICS INTERNATIONAL
卷 40, 期 6, 页码 8869-8874出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.12.132
关键词
Exchange reaction; Li ion battery; Atmospheric annealing; Nb2O5; Li4Ti5O12
资金
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2010-C1AAA001-2010-0028971]
The effects of atmospheric annealing on electrochemical performance for Nb2O5-doped Li4Ti5O12 anode materials have been investigated. The annealing of Nb2O5-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 Li4Ti5O12 was primarily reduced to increase the density of Ti3+ ions. This caused expansion of the Li4Ti5O12 lattice, but had little impact on Li-ion diffusion into the lattice. When concurrent doping and annealing induced such compositional and electrical modification of Li4Ti5O12, 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. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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