1. H+ diffusion and electrochemical stability of Li1+x+y Al x Ti2−x Si y P3−y O12 glass in aqueous Li/air battery electrolytes
- Author
-
Ding, Fei, Xu, Wu, Shao, Yuyan, Chen, Xilin, Wang, Zhiguo, Gao, Fei, Liu, Xingjiang, and Zhang, Ji-Guang
- Subjects
- *
ELECTROCHEMICAL analysis , *DIFFUSION , *LITHIUM-ion batteries , *ELECTROLYTES , *METALLIC glasses , *AQUEOUS solutions , *ELECTRICAL conductors - Abstract
Abstract: It is well known that LATP (Li1+x+y Al x Ti2−x Si y P3−y O12) glass is a good lithium (Li)-ion conductor. However, the interaction between LATP glass and H+ ions in aqueous electrolytes (including the diffusion and surface adsorption of H+ ions) needs to be well understood before the long-term application of LATP glass in an aqueous electrolyte can be realized. In this work, we investigate H+-ion diffusion in LATP glass and their interactions with the glass surface using both experimental and modeling approaches. Our results indicate that the apparent H+-related current observed in the initial cyclic voltammetry scan should be attributed to the adsorption of H+ ions on the LATP glass rather than the bulk diffusion of H+ ions. Furthermore, density functional theory calculations indicate that the H+-ion diffusion energy barrier (3.21 eV) is much higher than that for Li+ ions (0.79 eV) and Na+ ions (0.79 eV) in a NASICON-type LiTi2(PO4)3 material. As a result, H+-ion conductivity in LATP glass is negligible at room temperature. However, significant surface corrosion was found after the LATP glass in a strong alkaline electrolyte. Therefore, to prevent LATP glass from corrosion, appropriate electrolytes must be developed for long-term operation of LATP in aqueous Li–air batteries. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF