Kim, Seul-Ki Kwon, Eun-Seok Kim, Tae-Heui Moon, Jooho Kim, Joosun 2024-01-20T09:31:50Z 2024-01-20T09:31:50Z 2021-09-05 2014-07 0272-8842 https://pubs.kist.re.kr/handle/201004/126631 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. English ELSEVIER SCI LTD HIGH-RATE PERFORMANCE ELECTROCHEMICAL PROPERTIES ELECTRICAL-CONDUCTIVITY RATE-CAPABILITY SPINEL COMPOSITE STORAGE CARBON Effects of atmospheric Ti (III) reduction on Nb2O5-doped Li4Ti5O12 anode materials for lithium ion batteries Article 10.1016/j.ceramint.2013.12.132 1 CERAMICS INTERNATIONAL, v.40, no.6, pp.8869 - 8874 CERAMICS INTERNATIONAL 40 6 8869 8874 scie scopus 000335201800152 2-s2.0-84897432700 Materials Science, Ceramics Materials Science Article HIGH-RATE PERFORMANCE ELECTROCHEMICAL PROPERTIES ELECTRICAL-CONDUCTIVITY RATE-CAPABILITY SPINEL COMPOSITE STORAGE CARBON Exchange reaction Li ion battery Atmospheric annealing Nb2O5 Li4Ti5O12