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Title: A Low-Voltage Layered Na2TiGeO5 Anode for Lithium-Ion Battery

Journal Article · · Small
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [3];  [4]; ORCiD logo [2]
  1. Beijing University of Technology (China); Univ. of Science and Technology, Beijing (China)
  2. Beijing University of Technology (China)
  3. Fudan Univ., Shanghai (China)
  4. National Institute of Scientific Research (INRS) (Canada)

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. In this work, 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704
OSTI ID:
1981441
Journal Information:
Small, Journal Name: Small Journal Issue: 14 Vol. 18; ISSN 1613-6810
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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