Electrochemically active nanocomposites of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals with improved electrode performance

Song Yi Han; In Young Kim; Sang Hyup Lee; Seong Ju Hwang

doi:10.1016/j.electacta.2012.03.175

Electrochemically active nanocomposites of Li ₄Ti ₅O ₁₂ 2D nanosheets and SnO ₂ 0D nanocrystals with improved electrode performance

Song Yi Han
, In Young Kim
, Sang Hyup Lee
, Seong Ju Hwang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

Electrochemically active nanocomposites consisting of Li ₄Ti ₅O ₁₂ 2D nanosheets and SnO ₂ 0D nanocrystals are synthesized by the crystal growth of tin dioxide on the surface of 2D nanostructured lithium titanate. According to powder X-ray diffraction and electron microscopic analyses, the rutile-structured SnO ₂ nanocrystals are stabilized on the surface of spinel-structured Li ₄Ti ₅O ₁₂ 2D nanosheets. The homogeneous hybridization of tin dioxide with lithium titanate is confirmed by elemental mapping analysis. Ti K-edge X-ray absorption near-edge structure and Sn 3d X-ray photoelectron spectroscopy indicate the stabilization of tetravalent titanium ions in the spinel lattice of Li ₄Ti ₅O ₁₂ and the formation of SnO ₂ phase with tetravalent Sn oxidation state. The electrochemical measurements clearly demonstrate the promising functionality of the present nanocomposites as anode for lithium secondary batteries. The Li ₄Ti ₅O ₁₂-SnO ₂ nanocomposites show larger discharge capacity and better cyclability than do the uncomposited Li ₄Ti ₅O ₁₂ and SnO ₂ phases, indicating the synergistic effect of nanocomposite formation on the electrode performance of Li ₄Ti ₅O ₁₂ and SnO ₂. The present experimental findings underscore the validity of 2D nanostructured lithium titanate as a useful platform for the stabilization of nanocrystalline electrode materials and also for the improvement of their functionality.

Original language	English
Pages (from-to)	59-64
Number of pages	6
Journal	Electrochimica Acta
Volume	74
DOIs	https://doi.org/10.1016/j.electacta.2012.03.175
Publication status	Published - 2012 Jul 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the “Korean Government (MEST)” (NRF-2010-C1AAA001-2010-0029065), by the Korea Ministry of Environment as “Converging Technology Project” (191-101-001), and by National Research Foundation of Korea Grant funded by the Korean Government (2010-0001485). The experiments at Pohang Accelerator Laboratory (PAL) were supported in part by MOST and POSTECH.

Keywords

Anode materials
Lithium secondary batteries
Nanocomposites
Nanoparticles
Nanosheets

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

Access to Document

10.1016/j.electacta.2012.03.175

Cite this

@article{2628fe3323734fcd8d0808f471937e99,

title = "Electrochemically active nanocomposites of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals with improved electrode performance",

abstract = "Electrochemically active nanocomposites consisting of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals are synthesized by the crystal growth of tin dioxide on the surface of 2D nanostructured lithium titanate. According to powder X-ray diffraction and electron microscopic analyses, the rutile-structured SnO 2 nanocrystals are stabilized on the surface of spinel-structured Li 4Ti 5O 12 2D nanosheets. The homogeneous hybridization of tin dioxide with lithium titanate is confirmed by elemental mapping analysis. Ti K-edge X-ray absorption near-edge structure and Sn 3d X-ray photoelectron spectroscopy indicate the stabilization of tetravalent titanium ions in the spinel lattice of Li 4Ti 5O 12 and the formation of SnO 2 phase with tetravalent Sn oxidation state. The electrochemical measurements clearly demonstrate the promising functionality of the present nanocomposites as anode for lithium secondary batteries. The Li 4Ti 5O 12-SnO 2 nanocomposites show larger discharge capacity and better cyclability than do the uncomposited Li 4Ti 5O 12 and SnO 2 phases, indicating the synergistic effect of nanocomposite formation on the electrode performance of Li 4Ti 5O 12 and SnO 2. The present experimental findings underscore the validity of 2D nanostructured lithium titanate as a useful platform for the stabilization of nanocrystalline electrode materials and also for the improvement of their functionality.",

keywords = "Anode materials, Lithium secondary batteries, Nanocomposites, Nanoparticles, Nanosheets",

author = "Han, \{Song Yi\} and Kim, \{In Young\} and Lee, \{Sang Hyup\} and Hwang, \{Seong Ju\}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea Grant funded by the “Korean Government (MEST)” (NRF-2010-C1AAA001-2010-0029065), by the Korea Ministry of Environment as “Converging Technology Project” (191-101-001), and by National Research Foundation of Korea Grant funded by the Korean Government (2010-0001485). The experiments at Pohang Accelerator Laboratory (PAL) were supported in part by MOST and POSTECH. ",

year = "2012",

month = jul,

day = "15",

doi = "10.1016/j.electacta.2012.03.175",

language = "English",

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journal = "Electrochimica Acta",

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AU - Han, Song Yi

AU - Kim, In Young

AU - Lee, Sang Hyup

AU - Hwang, Seong Ju

N1 - Funding Information: This work was supported by the National Research Foundation of Korea Grant funded by the “Korean Government (MEST)” (NRF-2010-C1AAA001-2010-0029065), by the Korea Ministry of Environment as “Converging Technology Project” (191-101-001), and by National Research Foundation of Korea Grant funded by the Korean Government (2010-0001485). The experiments at Pohang Accelerator Laboratory (PAL) were supported in part by MOST and POSTECH.

PY - 2012/7/15

Y1 - 2012/7/15

N2 - Electrochemically active nanocomposites consisting of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals are synthesized by the crystal growth of tin dioxide on the surface of 2D nanostructured lithium titanate. According to powder X-ray diffraction and electron microscopic analyses, the rutile-structured SnO 2 nanocrystals are stabilized on the surface of spinel-structured Li 4Ti 5O 12 2D nanosheets. The homogeneous hybridization of tin dioxide with lithium titanate is confirmed by elemental mapping analysis. Ti K-edge X-ray absorption near-edge structure and Sn 3d X-ray photoelectron spectroscopy indicate the stabilization of tetravalent titanium ions in the spinel lattice of Li 4Ti 5O 12 and the formation of SnO 2 phase with tetravalent Sn oxidation state. The electrochemical measurements clearly demonstrate the promising functionality of the present nanocomposites as anode for lithium secondary batteries. The Li 4Ti 5O 12-SnO 2 nanocomposites show larger discharge capacity and better cyclability than do the uncomposited Li 4Ti 5O 12 and SnO 2 phases, indicating the synergistic effect of nanocomposite formation on the electrode performance of Li 4Ti 5O 12 and SnO 2. The present experimental findings underscore the validity of 2D nanostructured lithium titanate as a useful platform for the stabilization of nanocrystalline electrode materials and also for the improvement of their functionality.

AB - Electrochemically active nanocomposites consisting of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals are synthesized by the crystal growth of tin dioxide on the surface of 2D nanostructured lithium titanate. According to powder X-ray diffraction and electron microscopic analyses, the rutile-structured SnO 2 nanocrystals are stabilized on the surface of spinel-structured Li 4Ti 5O 12 2D nanosheets. The homogeneous hybridization of tin dioxide with lithium titanate is confirmed by elemental mapping analysis. Ti K-edge X-ray absorption near-edge structure and Sn 3d X-ray photoelectron spectroscopy indicate the stabilization of tetravalent titanium ions in the spinel lattice of Li 4Ti 5O 12 and the formation of SnO 2 phase with tetravalent Sn oxidation state. The electrochemical measurements clearly demonstrate the promising functionality of the present nanocomposites as anode for lithium secondary batteries. The Li 4Ti 5O 12-SnO 2 nanocomposites show larger discharge capacity and better cyclability than do the uncomposited Li 4Ti 5O 12 and SnO 2 phases, indicating the synergistic effect of nanocomposite formation on the electrode performance of Li 4Ti 5O 12 and SnO 2. The present experimental findings underscore the validity of 2D nanostructured lithium titanate as a useful platform for the stabilization of nanocrystalline electrode materials and also for the improvement of their functionality.

KW - Anode materials

KW - Lithium secondary batteries

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KW - Nanoparticles

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