4.7 Article

Achieving superior high-temperature sodium storage performance in a layered potassium vanadate

Journal

SCIENCE CHINA-MATERIALS
Volume 65, Issue 3, Pages 646-652

Publisher

SCIENCE PRESS
DOI: 10.1007/s40843-021-1780-x

Keywords

sodium-ion battery; high-temperature performance; layered potassium vanadate

Funding

  1. National Natural Science Foundation of China [51801030, 51902032, 51802044, 51902062, 51802043]
  2. Natural Science Foundation of Jiangsu Province [BK20191026]
  3. Guangdong Natural Science Funds for the Distinguished Young Scholar [2019B151502039]

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This study synthesized potassium vanadate (KV3O8) nanobelts using a simple potassium ion intercalation process, which exhibited superior sodium storage performance and cycle life at high temperatures. Ex-situ X-ray diffraction confirmed the structural stability of KV3O8 nanobelts throughout charge/discharge cycles, making them a promising candidate for high-temperature sodium-ion batteries.
The high-temperature sodium-ion batteries (SIBs) used for large-scale energy storage have attracted extensive attention in recent years. However, the development of SIBs is still hampered mainly by their poor charge/discharge efficiency and stability, necessitating the search for appropriate electrodes. A simple potassium ion intercalation process is used herein to obtain the potassium vanadate (KV3O8) nanobelts. When serving as the anode for SIBs at a high temperature (60 degrees C), the KV3O8 nanobelts display superior sodium storage performance with a high capacity of 414 mA h g(-1) at 0.1 A g(-1), remarkable rate capability (220 mA h g(-1) at 20 A g(-1)), and super-long cycle life (almost no capacity fading at 10 A g(-1) over 1000 cycles). Moreover, the ex-situ X-ray powder diffraction reveals no structural changes throughout the whole charge/discharge process, which further confirms their outstanding stability, indicating KV3O8 nanobelts are a promising candidate for high-temperature SIBs.

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