NDLI: Li4Ti5O12 nanosheets as high-rate and long-life anode materials for sodium-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Si Te Li, Hui Zhong Tang, Sha Sha Yang, Lin Yu Min, Jie Yan, Ning Lei, Ming Lu, Ya Kun Liu, Jun
Copyright Year	2015
Abstract	According to recent reports, a multiphase design can provide a new method to improve the performance of L4T5O12–TiO2 anodes for lithium-ion batteries (LIBs). But in the case of sodium-ion batteries (SIBs), little attention is paid to the investigation of whether TiO2 phases have similar effects as they have in LIBs. In this paper, uniform pristine Li4Ti5O12 (LTO) and Li4Ti5O12–rutile TiO2 (LTO–RT) nanosheets were successfully fabricated on a large scale via a simple hydrothermal reaction. Their electrochemical performance as anodes for SIBs was carefully compared for the first time. The results show that the existence of TiO2 phases in LTO–TiO2 composites has a positive effect on the capacity but a negative effect on the cyclability as anodes for SIBs, which is very different from the previously reported effects of TiO2 phases in LTO–TiO2 composites as anodes for LIBs. Moreover, LTO nanosheets fabricated by our synthesis method deliver a reversible capacity up to 145 mA h g−1 at 1C and keep 91% capacity retention after 400 cycles. As far as we know, this is the longest cycle life to date for SIBs using LTO as anode materials. Based on a scan rate-dependent cyclic voltammetry test, a pseudocapacitive charge storage mechanism has been firstly proposed for Na-ion storage in a pristine LTO electrode, which contributes to the excellent rate capacity and such high cycling stability of LTO electrodes for SIBs.
Starting Page	24446
Ending Page	24452
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	48
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta07403g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	LTO Lithium-ion battery Titanium dioxide Electrochemistry Anode Cyclic voltammetry Electrode
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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