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Title: Ultrathin Li4Ti5O12 nanosheets as anode materials for lithium and sodium storage

Abstract

Two-dimensional Li4Ti5O12 (LTO) nanosheets are prepared via a surfactant assisted hydrothermal process. Polyether (P123) was added as the surfactant to modify the surface and control the microstructure of the hydrothermal products and thus affect the electrochemical performance of the as-synthesized LTO anode material. XRD results show that the addition of P123 can restrain the growth of Li2TiO3 during the hydrothermal process, thus affecting the morphology and enhancing the rate performance of the final products. With the addition of P123, the growth of LTO can be restrained and ultrathin LTO nanosheets can be obtained after high temperature sintering, which is beneficial for the charge transfer and Li+ ion diffusion. The rate performance of these two different LTO materials is very different because of their differences in phase composition and fine morphology. The P123-assisted nanostructured LTO sample (P-LTO) shows a much higher rate capability than the LTO sample without P123, with over 130 mAh g-1 capacity retained at the charge-discharge rate of 64C when used in a lithium battery. For intercalation of larger size Na+ ions, the P-LTO still exhibit a capacity of 115 mAh g-1 at a charge (de-sodiation process) rate of 10C and maintains 96% capacity after 400 cycles

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1324886
Report Number(s):
PNNL-SA-114583
Journal ID: ISSN 1944-8244; 48379; VT1201000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Applied Materials and Interfaces; Journal Volume: 8; Journal Issue: 26
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Feng, Xuyong, Zou, Hailin, Xiang, Hongfa, Guo, Xin, Zhou, Tianpei, Wu, Yucheng, Xu, Wu, Yan, Pengfei, Wang, Chong M., Zhang, Jiguang, and Yu, Yan. Ultrathin Li4Ti5O12 nanosheets as anode materials for lithium and sodium storage. United States: N. p., 2016. Web. doi:10.1021/acsami.6b04752.
Feng, Xuyong, Zou, Hailin, Xiang, Hongfa, Guo, Xin, Zhou, Tianpei, Wu, Yucheng, Xu, Wu, Yan, Pengfei, Wang, Chong M., Zhang, Jiguang, & Yu, Yan. Ultrathin Li4Ti5O12 nanosheets as anode materials for lithium and sodium storage. United States. doi:10.1021/acsami.6b04752.
Feng, Xuyong, Zou, Hailin, Xiang, Hongfa, Guo, Xin, Zhou, Tianpei, Wu, Yucheng, Xu, Wu, Yan, Pengfei, Wang, Chong M., Zhang, Jiguang, and Yu, Yan. 2016. "Ultrathin Li4Ti5O12 nanosheets as anode materials for lithium and sodium storage". United States. doi:10.1021/acsami.6b04752.
@article{osti_1324886,
title = {Ultrathin Li4Ti5O12 nanosheets as anode materials for lithium and sodium storage},
author = {Feng, Xuyong and Zou, Hailin and Xiang, Hongfa and Guo, Xin and Zhou, Tianpei and Wu, Yucheng and Xu, Wu and Yan, Pengfei and Wang, Chong M. and Zhang, Jiguang and Yu, Yan},
abstractNote = {Two-dimensional Li4Ti5O12 (LTO) nanosheets are prepared via a surfactant assisted hydrothermal process. Polyether (P123) was added as the surfactant to modify the surface and control the microstructure of the hydrothermal products and thus affect the electrochemical performance of the as-synthesized LTO anode material. XRD results show that the addition of P123 can restrain the growth of Li2TiO3 during the hydrothermal process, thus affecting the morphology and enhancing the rate performance of the final products. With the addition of P123, the growth of LTO can be restrained and ultrathin LTO nanosheets can be obtained after high temperature sintering, which is beneficial for the charge transfer and Li+ ion diffusion. The rate performance of these two different LTO materials is very different because of their differences in phase composition and fine morphology. The P123-assisted nanostructured LTO sample (P-LTO) shows a much higher rate capability than the LTO sample without P123, with over 130 mAh g-1 capacity retained at the charge-discharge rate of 64C when used in a lithium battery. For intercalation of larger size Na+ ions, the P-LTO still exhibit a capacity of 115 mAh g-1 at a charge (de-sodiation process) rate of 10C and maintains 96% capacity after 400 cycles},
doi = {10.1021/acsami.6b04752},
journal = {ACS Applied Materials and Interfaces},
number = 26,
volume = 8,
place = {United States},
year = 2016,
month = 6
}
  • The commercial Li4Ti5O12 (LTO) is successfully modified by AlF3 via a low temperature process. After being calcined at 400oC for 5 hours, AlF3 reacts with LTO to form a composite material which mainly consists of Al3+ and F- co-doped LTO with small amounts of anatase TiO2 and Li3AlF6. Al3+ and F- co-doped LTO demonstrates largely improved rate capability comparing to the pristine LTO. Since the amount of the byproduct TiO2 is relatively small, the modified LTO electrodes retain the main voltage characteristics of LTO with a minor feature similar to those of anatase TiO2. The doped LTO anodes deliver highermore » discharge capacity and significantly improved high-rate performance when compared to the pristine LTO anode. They also demonstrate excellent long-term cycling stability at elevated temperatures. Therefore, Al3+ and F- co-doped LTO synthesized at low temperature is an excellent anode for stable and ultra-high power lithium-ion batteries.« less
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  • Lithium and magnesium exhibit rather different properties as battery anode materials with respect to the phenomenon of dendrite formation which can lead to short-circuits in batteries. Diffusion processes are the key to understanding structure forming processes on surfaces. Therefore, we have determined adsorption energies and barriers for the self-diffusion on Li and Mg using periodic density functional theory calculations and contrasted the results to Na which is also regarded as a promising electrode material in batteries. According to our calculations, magnesium exhibits a tendency towards the growth of smooth surfaces as it exhibits lower diffusion barriers than lithium and sodium,more » and as an hcp metal it favors higher-coordinated configurations in contrast to the bcc metals Li and Na. These characteristic differences are expected to contribute to the unequal tendencies of these metals with respect to dendrite growth.« less