A Low‐Voltage Layered Na2TiGeO5 Anode for Lithium‐Ion Battery

Titanium‐based anode materials have achieved much progress with the wide studies in lithium‐ion batteries. However, these known materials usually possess high discharge voltage platforms and limited energy densities. Herein, a titanium‐based oxide of Na2TiGeO5 with layered structure, two‐dimensional...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2022-04, Vol.18 (14), p.n/a
Main Authors: Liu, Zhiwei, He, Di, Wang, Boya, Wu, Tianhao, Zhao, Shu, Li, Xunlu, He, Shiman, Liang, Yuan, Zhou, Yongning, Sun, Shuhui, Yu, Haijun
Format: Article
Language:English
Subjects:
amorphization
Anodes
Density functional theory
Discharge
Electric potential
Electrochemical analysis
Electrode materials
ENERGY STORAGE
Flux density
Lamellar structure
Lithium-ion batteries
Na 2TiGeO 5 sheets
Na2TiGeO5 sheets
Nanotechnology
reaction mechanisms
Titanium
titanium-based anode materials
Voltage
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Summary:Titanium‐based anode materials have achieved much progress with the wide studies in lithium‐ion batteries. However, these known materials usually possess high discharge voltage platforms and limited energy densities. Herein, a titanium‐based oxide of Na2TiGeO5 with layered structure, two‐dimensional lamellar frame and exposed highly active (001) facet, exhibiting good electrochemical performance in terms of high capacity (410 mAh g–1 with a current density of 50 mA g–1), excellent rate capability and cycling stability with no obvious capacity attenuation after 4000 cycles, is reported. The appropriate discharge voltage plateau at around 0.2 V endows the Na2TiGeO5 anode material high security compared with graphite and high energy density compared with spinel Li4Ti5O12. Combining the electrochemical tests and the density functional theory calculations, the Li+ storage mechanism of Na2TiGeO5 is elucidated and the conversion reaction process is revealed. More importantly, this study provides a way to develop low‐voltage and high‐capacity titanium‐based anode materials for efficient energy storage. In recent years, titanium‐based anode materials have aroused huge attention due to the safe working potentials and suitable capacities in applications. Herein, a new titanium‐based oxide of Na2TiGeO5 with the layered structure, two‐dimensional lamellar frame, and the exposed high‐activity (001) facet via the direct hydrothermal method, exhibiting excellent electrochemical performance is designed.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202107608