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

Journal Article


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 4Ti5O12 (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. Distorted lattice: Zr4+ is doped into a 1 D spinel Li4Ti5O12 (LTO) nanostructure and the resulting electrochemical properties are explored through a combined theoretical and experimental investigation. The improved electrochemical performance resulting from incorporation of Zr4+ in the LTO is due to lattice distortion and, thereby, enlarged Li+ diffusion paths rather than to a change in the electronic structure.

Authors


  •   Kim, Jae-Geun (external author)
  •   Park, Min-Sik (external author)
  •   Hwang, Soomin (external author)
  •   Heo, Yoon-Uk (external author)
  •   Liao, Ting (external author)
  •   Sun, Ziqi
  •   Park, Jong Hwan (external author)
  •   Kim, Ki Jae (external author)
  •   Jeong, Goojin (external author)
  •   Kim, Young-Jun (external author)
  •   Kim, Jung Ho
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Kim, J., Park, M., Hwang, S., Heo, Y., Liao, T., Sun, Z., Park, J., Kim, K., Jeong, G., Kim, Y., Kim, J. & Dou, S. Xue. (2014). Zr4+ doping in Li4Ti5O12 anode for lithium-ion batteries: open Li+ diffusion paths through structural imperfection. ChemSusChem: chemistry and sustainability, energy and materials, 7 (5), 1451-1457.

Scopus Eid


  • 2-s2.0-84901020650

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1339

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 1451

End Page


  • 1457

Volume


  • 7

Issue


  • 5

Place Of Publication


  • Germany

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 4Ti5O12 (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. Distorted lattice: Zr4+ is doped into a 1 D spinel Li4Ti5O12 (LTO) nanostructure and the resulting electrochemical properties are explored through a combined theoretical and experimental investigation. The improved electrochemical performance resulting from incorporation of Zr4+ in the LTO is due to lattice distortion and, thereby, enlarged Li+ diffusion paths rather than to a change in the electronic structure.

Authors


  •   Kim, Jae-Geun (external author)
  •   Park, Min-Sik (external author)
  •   Hwang, Soomin (external author)
  •   Heo, Yoon-Uk (external author)
  •   Liao, Ting (external author)
  •   Sun, Ziqi
  •   Park, Jong Hwan (external author)
  •   Kim, Ki Jae (external author)
  •   Jeong, Goojin (external author)
  •   Kim, Young-Jun (external author)
  •   Kim, Jung Ho
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Kim, J., Park, M., Hwang, S., Heo, Y., Liao, T., Sun, Z., Park, J., Kim, K., Jeong, G., Kim, Y., Kim, J. & Dou, S. Xue. (2014). Zr4+ doping in Li4Ti5O12 anode for lithium-ion batteries: open Li+ diffusion paths through structural imperfection. ChemSusChem: chemistry and sustainability, energy and materials, 7 (5), 1451-1457.

Scopus Eid


  • 2-s2.0-84901020650

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1339

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 1451

End Page


  • 1457

Volume


  • 7

Issue


  • 5

Place Of Publication


  • Germany