Bibliographic Details
| Title: |
Understanding LiOH Chemistry in a Ruthenium Catalyzed Li-O2 Battery |
| Authors: |
Liu, Tao, Liu, Zigeng, Kim, Gunwoo, Frith, James T., Garcia-Araez, Nuria, Grey, Clare P. |
| Publication Year: |
2018 |
| Collection: |
Physics (Other) |
| Subject Terms: |
Physics - Chemical Physics |
| More Details: |
Non-aqueous Li-O2 batteries are promising for next generation energy storage. New battery chemistries based on LiOH, rather than Li2O2, have recently been reported in systems with added water, one using a soluble additive LiI and the other using solid Ru catalysts. Here, we focus on the mechanism of Ru-catalyzed LiOH chemistry. Using nuclear magnetic resonance, operando electrochemical pressure measurements and mass spectrometry, we show that on discharging LiOH forms via a 4 e- oxygen reduction reaction, the H in LiOH coming solely from added H2O and the O from both O2 and H2O. On charging, quantitative LiOH oxidation occurs at 3.1 V, with O being trapped in a form of dimethyl sulfone in the electrolyte. Compared to Li2O2, LiOH formation over Ru incurs hardly any side reactions, a critical advantage for developing a long-lived battery. An optimized metal catalyst-electrolyte couple needs to be sought that aids LiOH oxidation and is able stable towards attack by hydroxyl radicals. |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/1805.03268 |
| Accession Number: |
edsarx.1805.03268 |
| Database: |
arXiv |
