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A New Triclinic Phase Na2Ti3O7 Anode for Sodium‐Ion Battery.

Authors :
Cao, Yang
Ye, Qi
Wang, Fanfan
Fan, Xiaoliang
Hu, Lintong
Wang, Fakun
Zhai, Tianyou
Li, Huiqiao
Source :
Advanced Functional Materials. 9/24/2020, Vol. 30 Issue 39, p1-9. 9p.
Publication Year :
2020

Abstract

A new phase Na2Ti3O7 compound is synthesized by solid‐state method for the first time, which is verified to belong to the triclinic structure in P‐1 space group. Compared to the conventional monoclinic Na2Ti3O7 (m‐NTO), in P21/m1 space group, the triclinic Na2Ti3O7 (t‐NTO) possesses a shorter O‐O band in the distorted TiO6 octahedron, which accounts for more smooth Na+ transport channels and a more stable layered structure with smaller fluctuation. The experimental results show that the t‐NTO keeps a low charge potential plateau at 0.3 V compared to the m‐NTO, but with much promoted structure resilience. It delivers a capacity retention of 94.7%, far exceeding the 25.7% of the m‐NTO upon decades of cycles. In situ X‐ray diffraction reveals that the conventional m‐NTO experiences an irreversible phase transition during insertion/de‐insertion of Na+, while the new t‐NTO can recover its structure reversibly after discharge and charge, which is consistent with its improved cycling performance. The results demonstrate a new t‐NTO anode and provide a new understanding for the phase diversity of sodium‐ion battery materials. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1616301X
Volume :
30
Issue :
39
Database :
Academic Search Index
Journal :
Advanced Functional Materials
Publication Type :
Academic Journal
Accession number :
146080992
Full Text :
https://doi.org/10.1002/adfm.202003733