ABSTRACT

In aqueous rechargeable lithium ion batteries, LiV3O8 exhibits obviously enhanced electrochemical performance after AlF3
surface modification owing to improved surface stability to fragile aqueous electrolyte. The cycle life of LiV3O8 is significantly
enhanced by the presence of an AlF3 coating at an optimal content of 1 wt.%. The results of powder X-ray diffraction,
energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, inductively coupled plasma-optical
emission spectrometry, and galvanostatic charge-discharge measurements confirm that the electrochemical improvement
can be attributed mainly to the presence of AlF3 on the surface of LiV3O8. Furthermore, the AlF3 coating significantly
reduces vanadium ion dissolution and surface failure by stabilizing the surface of the LiV3O8 in an aqueous electrolyte solution.
The results suggest that the AlF3 coating can prevent the formation of unfavorable side reaction components and facilitate
lithium ion diffusion, leading to reduced surface resistance and improved surface stability compared to bare LiV3O8
and affording enhanced electrochemical performance in aqueous electrolyte solutions.

Author

Artur Tron¹, Hyunchul Kang¹, Jinho Kim²,*, and Junyoung Mun¹,*
¹Department of Energy and Chemical Engineering, Incheon National University, 12-1, Songdo-dong, Yeonsu-gu, Incheon
22012, Republic of Korea
²Department of Chemistry, Incheon National University, 12-1, Songdo-dong, Yeonsu-gu, Incheon 22012, Republic of Korea¹¹¹