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Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performance

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Abstract

This paper is dedicated to elucidating the role of the anatase/TiO2(B) heterointerface, which functions as an ‘ion reservoir’ for dominant pseudocapacitance, for ultrastable high-rate energy storage in both Li-ion and Na-ion batteries (LIBs, SIBs). Dual-phase nanosheets are in situ assembled to form anatase/TiO2(B) nanoflower-shaped anodes via a facile hydrothermal and thermolysis process. The abundant oxygen vacancies on the ultrathin nanosheets favor pseudocapacitive behaviors and fast ionic/electronic transport during Li+/Na+ insertion/extraction cycles. The density functional theory calculations combined with ab initio molecular dynamics simulations corroborate the important role of the anatase/TiO2(B) heterointerface in promoting electrochemical kinetics. The heterointerface has much lower adsorption energies of Li+/Na+ than in each phase acting alone, and the presence of an internal electric field with a high ionic concentration at the interface ameliorates charge transport. Therefore, the dual-phase anodes deliver ultrastable electrochemical performance with high specific capacities of 193 and 112 mA h g−1 at an exceptionally fast 20 C in LIBs and SIBs, respectively. Their cycling stability is equally remarkable, sustaining reversible capacities of 212 mA h g−1 at 10 C and 173 mA h g−1 at 5 C after 1000 cycles, respectively. These new findings may help rationally design high-performance multi-functional anodes for next-generation metal-ion batteries.

Graphical abstract: Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performance

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Publication details

The article was received on 18 Jun 2019, accepted on 29 Aug 2019 and first published on 29 Aug 2019


Article type: Communication
DOI: 10.1039/C9NH00402E
Nanoscale Horiz., 2020, Advance Article

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    Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performance

    G. Liu, H. Wu, Q. Meng, T. Zhang, D. Sun, X. Jin, D. Guo, N. Wu, X. Liu and J. Kim, Nanoscale Horiz., 2020, Advance Article , DOI: 10.1039/C9NH00402E

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