Zr4+ doping in Li4Ti5O12 anode for lithium-ion batteries: open Li+ diffusion paths through structural imperfection

Kim, Jae-Geun, Park, Min-Sik, Hwang, Soo Min, Heo, Yoon-Uk, Liao, Ting, Sun, Ziqi, Park, Jong Hwan, Kim, Ki Jae, Jeong, Goojin, Kim, Young-Jun, Kim, Jung Ho and Dou, Shi Xue (2014) Zr4+ doping in Li4Ti5O12 anode for lithium-ion batteries: open Li+ diffusion paths through structural imperfection. ChemSusChem, 7 5: 1451-1457. doi:10.1002/cssc.201301393


Author Kim, Jae-Geun
Park, Min-Sik
Hwang, Soo Min
Heo, Yoon-Uk
Liao, Ting
Sun, Ziqi
Park, Jong Hwan
Kim, Ki Jae
Jeong, Goojin
Kim, Young-Jun
Kim, Jung Ho
Dou, Shi Xue
Title Zr4+ doping in Li4Ti5O12 anode for lithium-ion batteries: open Li+ diffusion paths through structural imperfection
Formatted title
Zr4+ doping in Li4Ti5O12 anode for lithium-ion batteries: open Li+ diffusion paths through structural imperfection
Journal name ChemSusChem   Check publisher's open access policy
ISSN 1864-564X
Publication date 2014-05-01
Year available 2014
Sub-type Article (original research)
DOI 10.1002/cssc.201301393
Open Access Status
Volume 7
Issue 5
Start page 1451
End page 1457
Total pages 7
Place of publication Weinheim Germany
Publisher Wiley
Language eng
Subject 2304 Environmental Chemistry
1500 Chemical Engineering
2500 Materials Science
2100 Energy
Abstract One-dimensional nanomaterials have short Li diffusion paths and promising structural stability, which results in a long cycle life during Li insertion and extraction processes in lithium rechargeable batteries. In this study, we fabricated one-dimensional spinel Li TiO (LTO) nanofibers using an electrospinning technique and studied the Zr doping effect on the lattice, electronic structure, and resultant electrochemical properties of Li-ion batteries (LIBs). Accommodating a small fraction of Zr ions in the Ti sites of the LTO structure gave rise to enhanced LIB performance, which was due to structural distortion through an increase in the average lattice constant and thereby enlarged Li diffusion paths rather than changes to the electronic structure. Insulating ZrO nanoparticles present between the LTO grains due to the low Zr solubility had a negative effect on the Li extraction capacity, however. These results could provide key design elements for LTO anodes based on atomic level insights that can pave the way to an optimal protocol to achieve particular functionalities. Distorted lattice: Zr is doped into a 1 D spinel LiTiO (LTO) nanostructure and the resulting electrochemical properties are explored through a combined theoretical and experimental investigation. The improved electrochemical performance resulting from incorporation of Zr in the LTO is due to lattice distortion and, thereby, enlarged Li diffusion paths rather than to a change in the electronic structure.
Formatted abstract
One-dimensional nanomaterials have short Li+ diffusion paths and promising structural stability, which results in a long cycle life during Li+ insertion and extraction processes in lithium rechargeable batteries. In this study, we fabricated one-dimensional spinel Li4Ti5O12 (LTO) nanofibers using an electrospinning technique and studied the Zr4+ doping effect on the lattice, electronic structure, and resultant electrochemical properties of Li-ion batteries (LIBs). Accommodating a small fraction of Zr4+ ions in the Ti4+ sites of the LTO structure gave rise to enhanced LIB performance, which was due to structural distortion through an increase in the average lattice constant and thereby enlarged Li+ diffusion paths rather than changes to the electronic structure. Insulating ZrO2 nanoparticles present between the LTO grains due to the low Zr4+ solubility had a negative effect on the Li+ extraction capacity, however. These results could provide key design elements for LTO anodes based on atomic level insights that can pave the way to an optimal protocol to achieve particular functionalities.
Keyword Batteries
Electrospinning
Lithium
Spinel
Zirconium
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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