Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries

Abstract Development of high-power lithium-ion batteries with high safety and durability has become a key challenge for practical applications of large-scale energy storage devices. Accordingly, we report here on a promising strategy to synthesize a high-rate and long-life Li4Ti5O12-TiO2 anode mater...

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Autores principales:	Hui Xu, Jian Chen, Yanhuai Li, Xinli Guo, Yuanfang Shen, Dan Wang, Yao Zhang, Zengmei Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a209680ede144e3c89c8a920c82bfcb2
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spelling	oai:doaj.org-article:a209680ede144e3c89c8a920c82bfcb22021-12-02T16:08:09ZFabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries10.1038/s41598-017-03149-22045-2322https://doaj.org/article/a209680ede144e3c89c8a920c82bfcb22017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03149-2https://doaj.org/toc/2045-2322Abstract Development of high-power lithium-ion batteries with high safety and durability has become a key challenge for practical applications of large-scale energy storage devices. Accordingly, we report here on a promising strategy to synthesize a high-rate and long-life Li4Ti5O12-TiO2 anode material. The novel material exhibits remarkable rate capability and long-term cycle stability. The specific capacities at 20 and 30 C (1 C = 175 mA g−1) reach 170.3 and 168.2 mA h g−1, respectively. Moreover, a capacity of up to 161.3 mA h g−1 is retained after 1000 cycles at 20 C, and the capacity retention ratio reaches up to 94.2%. The extraordinary rate performance of the Li4Ti5O12-TiO2 composite is attributed to the existence of oxygen vacancies and grain boundaries, significantly enhancing electrical conductivity and lithium insertion/extraction kinetics. Meanwhile, the pseudocapacitive effect is induced owing to the presence of abundant interfaces in the composite, which is beneficial to enhancing specific capacity and rate capability. Additionally, the ultrahigh capacity at low rates, greater than the theoretical value of spinel Li4Ti5O12, may be correlated to the lithium vacancies in 8a sites, increasing the extra docking sites of lithium ions.Hui XuJian ChenYanhuai LiXinli GuoYuanfang ShenDan WangYao ZhangZengmei WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hui Xu Jian Chen Yanhuai Li Xinli Guo Yuanfang Shen Dan Wang Yao Zhang Zengmei Wang Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries
description	Abstract Development of high-power lithium-ion batteries with high safety and durability has become a key challenge for practical applications of large-scale energy storage devices. Accordingly, we report here on a promising strategy to synthesize a high-rate and long-life Li4Ti5O12-TiO2 anode material. The novel material exhibits remarkable rate capability and long-term cycle stability. The specific capacities at 20 and 30 C (1 C = 175 mA g−1) reach 170.3 and 168.2 mA h g−1, respectively. Moreover, a capacity of up to 161.3 mA h g−1 is retained after 1000 cycles at 20 C, and the capacity retention ratio reaches up to 94.2%. The extraordinary rate performance of the Li4Ti5O12-TiO2 composite is attributed to the existence of oxygen vacancies and grain boundaries, significantly enhancing electrical conductivity and lithium insertion/extraction kinetics. Meanwhile, the pseudocapacitive effect is induced owing to the presence of abundant interfaces in the composite, which is beneficial to enhancing specific capacity and rate capability. Additionally, the ultrahigh capacity at low rates, greater than the theoretical value of spinel Li4Ti5O12, may be correlated to the lithium vacancies in 8a sites, increasing the extra docking sites of lithium ions.
format	article
author	Hui Xu Jian Chen Yanhuai Li Xinli Guo Yuanfang Shen Dan Wang Yao Zhang Zengmei Wang
author_facet	Hui Xu Jian Chen Yanhuai Li Xinli Guo Yuanfang Shen Dan Wang Yao Zhang Zengmei Wang
author_sort	Hui Xu
title	Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries
title_short	Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries
title_full	Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries
title_fullStr	Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries
title_full_unstemmed	Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries
title_sort	fabrication of li4ti5o12-tio2 nanosheets with structural defects as high-rate and long-life anodes for lithium-ion batteries
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/a209680ede144e3c89c8a920c82bfcb2
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Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries

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