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Issue 42, 2017
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A new layered titanate Na2Li2Ti5O12 as a high-performance intercalation anode for sodium-ion batteries

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Abstract

Currently, it is a great challenge to find suitable electrode materials for sodium-ion batteries (SIBs) with large capacity, long cycle life, and high rate capability. Herein, we report a new layered titanate, Na2Li2Ti5O12 (NLT), derived from K2Li2Ti5O12 (KLT) via an ion-exchange method as a SIB anode material. KLT is prepared by a low-temperature solid-state reaction and then transformed into NLT by replacing potassium with sodium in a NaCl solution at room temperature. NLT provides a sodium-ion intercalation voltage at ∼0.5 V versus Na/Na+ and a reversible capacity of 175 mA h g−1 at a current density of 100 mA g−1. It also shows a high sodium-ion diffusion coefficient of 3.0 × 10−10 cm2 s−1, ensuring a high rate capability. For NLT, extremely high discharging rate capability is achieved with a capacity of more than 80 mA h g−1 at a 60 second full discharge and even with 70 mA h g−1 at a 34 second charge. Kinetics analysis based on cyclic voltammogram reveals a typical sodium-ion intercalation behavior in NLT. Furthermore, the first-principle calculation shows a lower migration energy barrier for sodium ions in NLT than that in other layered titanates. These results suggest that NLT is a very promising anode material for high-performance SIBs, especially for fast-charging stable SIBs.

Graphical abstract: A new layered titanate Na2Li2Ti5O12 as a high-performance intercalation anode for sodium-ion batteries

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Publication details

The article was received on 15 Jul 2017, accepted on 29 Sep 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06194C
Citation: J. Mater. Chem. A, 2017,5, 22208-22215
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    A new layered titanate Na2Li2Ti5O12 as a high-performance intercalation anode for sodium-ion batteries

    Y. Huang, J. Wang, L. Miao, Y. Jin, J. Peng, Q. Li, C. Fang, J. Han and Y. Huang, J. Mater. Chem. A, 2017, 5, 22208
    DOI: 10.1039/C7TA06194C

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