Ag quantum dots promoted Li₄Ti₅O₁₂/TiO₂ nanosheets with ultrahigh reversible capacity and super rate performance for power lithium-ion batteries
Date
2016
Authors
Ge, H.
Cui, L.
Zhang, B.
Ma, T.
Song, X.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Journal of Materials Chemistry A, 2016; 4(43):16886-16895
Statement of Responsibility
Hao Ge, Luxia Cui, Bing Zhang, Tian-Yi Ma and Xi-Ming Song
Conference Name
Abstract
Spinel Li₄Ti₅O₁₂ (LTO) has been widely studied as a promising anode material due to its outstanding structural stability and remarkable safety. However, the poor electron conductivity and low lithium-ion diffusion coefficient seriously limit its rate capability for the application in power lithium-ion batteries (LIBs). Herein, we demonstrate rationally designed Ag quantum dot (QD) modified LTO/TiO₂ nanosheets (Ag-LTO/TiO₂ NSs) synthesized via a facile hydrothermal process followed by heat treatment, highlighting simultaneously the promotion of electron conductivity and lithium-ion diffusion coefficient. The newly prepared Ag-LTO/TiO₂NSs deliver an ultrahigh reversible capacity of 177 mA h g⁻¹at 0.5C and a superior rate performance of more than 148 mA h g⁻¹ at 30C between 1.0 and 2.5 V. The achieved superior electrochemical performance largely surpasses that of the state-of-the-art LTO-based materials for LIBs. The present work provides a facile yet effective approach to significantly boost the high rate capability of LTO/TiO₂composites. These novel quantum dot modified 2-dimensional (2D) materials will pave the way to a new family of carbon-free anode materials in response to the increasing demands for high-power energy storage.
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Dissertation Note
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Description
Accepted 5th October 2016
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This journal is © The Royal Society of Chemistry 2016