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Title: Electrochemical studies of Mg-doped Li{sub 4}Ti{sub 5}O{sub 12} anodes.

Abstract

Commercial lithium-ion batteries use carbon as the material of choice for the anode. However, because lithiated carbon has a voltage very close to the potential of metallic lithium, there are concerns about the safety of fully-charged carbon electrodes. The safety issue can be addressed by using a material that intercalates lithium at a higher voltage. A promising material is the lithium-titanium-oxide spinel material Li{sub 4}Ti{sub 5}O{sub 12} which can accommodate 3 Li{sup +} ions per formula unit (corresponding to 175 mAh/g) in a two-phase reaction at approximately 1.5 V versus lithium. One of the drawbacks of this system is that the end-member Li{sub 4}Ti{sub 5}O{sub 12} is electronically insulating, which limits electron transfer at the electrode surface. By doping this material with magnesium, Li{sub 4{minus}x}Mg{sub x}Ti{sub 5}O{sub 12}, we introduced mixed-valent Ti{sup 4+}/Ti{sup 3+} into the stoichiometric spinel structure and thereby increased the electronic conductivity by several orders of magnitude without sacrificing electrochemical performance. In this presentation we will provide data on the extent of the solid solution in Li{sub 4{minus}x}Mg{sub x}Ti{sub 5}O{sub 12}, the variation of electronic conductivity as a function of dopant concentration and the rate capability of the doped material.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
11899
Report Number(s):
ANL/CMT/CP-99598
TRN: AH200119%%103
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 196th Meeting of the Electrochemical Society, Honolulu, HI (US), 10/17/1999--10/22/1999; Other Information: PBD: 19 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; METAL-NONMETAL BATTERIES; LITHIUM OXIDES; TITANIUM OXIDES; ANODES; CLATHRATES; DOPED MATERIALS; ELECTRON TRANSFER; MAGNESIUM OXIDES; SPINELS; ELECTRIC CONDUCTIVITY; PERFORMANCE

Citation Formats

Chen, C H, Jansen, A N, and Vaughey, J. Electrochemical studies of Mg-doped Li{sub 4}Ti{sub 5}O{sub 12} anodes.. United States: N. p., 1999. Web.
Chen, C H, Jansen, A N, & Vaughey, J. Electrochemical studies of Mg-doped Li{sub 4}Ti{sub 5}O{sub 12} anodes.. United States.
Chen, C H, Jansen, A N, and Vaughey, J. Mon . "Electrochemical studies of Mg-doped Li{sub 4}Ti{sub 5}O{sub 12} anodes.". United States. https://www.osti.gov/servlets/purl/11899.
@article{osti_11899,
title = {Electrochemical studies of Mg-doped Li{sub 4}Ti{sub 5}O{sub 12} anodes.},
author = {Chen, C H and Jansen, A N and Vaughey, J},
abstractNote = {Commercial lithium-ion batteries use carbon as the material of choice for the anode. However, because lithiated carbon has a voltage very close to the potential of metallic lithium, there are concerns about the safety of fully-charged carbon electrodes. The safety issue can be addressed by using a material that intercalates lithium at a higher voltage. A promising material is the lithium-titanium-oxide spinel material Li{sub 4}Ti{sub 5}O{sub 12} which can accommodate 3 Li{sup +} ions per formula unit (corresponding to 175 mAh/g) in a two-phase reaction at approximately 1.5 V versus lithium. One of the drawbacks of this system is that the end-member Li{sub 4}Ti{sub 5}O{sub 12} is electronically insulating, which limits electron transfer at the electrode surface. By doping this material with magnesium, Li{sub 4{minus}x}Mg{sub x}Ti{sub 5}O{sub 12}, we introduced mixed-valent Ti{sup 4+}/Ti{sup 3+} into the stoichiometric spinel structure and thereby increased the electronic conductivity by several orders of magnitude without sacrificing electrochemical performance. In this presentation we will provide data on the extent of the solid solution in Li{sub 4{minus}x}Mg{sub x}Ti{sub 5}O{sub 12}, the variation of electronic conductivity as a function of dopant concentration and the rate capability of the doped material.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}

Conference:
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