Ionic liquids present a promising new technology for cost-efficient separation of CO2 from post-combustion flue gas1. Their numerous combinations of cations and anions enable tuning of chemical and physical properties for CO2 capture. Additionally, we have suggested a new approach to energy storage using ionic liquids with CO2. Mixing of concentrated CO2 can create substantial electrical energy in a metal-oxygen battery system2. Coupled with fundamental knowledge of gas solubility in ionic liquids, we propose a new energy flow diagram3. An extension of ionic liquid based lithium-CO2 and lithium-O2 batteries is the direct use of exhaust gas from internal combustion engines. Here we present preliminary results for Li-air batteries using model lean burn automobile exhaust gas (NO, CO, C3H6, and excess O2). We recently found that the operating voltage/capacity under the lean burn condition was higher than the ones measured under a reference condition having the same O2 concentration4. This finding indicates that the residual gas components (NO, CO, C3H6) play a significant role in enhancing the operating voltage/capacity. In addition to being applied in primary batteries, this concept is particularly noteworthy because it presents a practical solution to use metal-air batteries under ambient air conditions. In this presentation, we will present the Li-air battery performances under various gas conditions, and then will explain the possible electrochemistry. References [1] J. F. Brennecke et al., J. Phys. Chem. Lett., 1 (2010) 3459. [2] K. Takechi et al., Chem. Commun., 47 (2011) 3463. [3] S. Seo et al., submitted for publication (2015). [4] F. Mizuno et al., submitted for publication (2015).

Lithium-gas energy storage using ionic liquids

251st National Meeting (2016)

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