Cost-effective energy storage solution and clean utilization of greenhouse gas—carbon dioxide (CO2)—are among the grand social challenges nowadays. These two challenges can be simultaneously resolved using the emerging technology called metal-CO2 battery (metal: Li, Na, Mg or Al), in which the inert CO2 gas can be electrochemically converted into value-added materials (carbon, carbonates or oxalates) while generating electricity. Among the metal-CO2 batteries, rechargeable Na-CO2 battery based on an electrochemical reaction of 4Na + 3CO2 ↔ 2Na2CO3 + C, is especially attractive due to the high abundance of Na resource (versus Li) and relatively high operating voltage of ~2.0 V (versus Mg and Al, &lt;1.0 V). However, the practical applications of Na-CO2 batteries have been impeded by large electrochemical polarization, low reversible capacity, and poor cycle life caused by the sluggish kinetics of CO2 reduction/evolution reactions and the evaporation/leakage of the liquid electrolytes due to the open cell configuration. Herein, we present an all-solid-state Na-CO2 battery constructed using a nanocarbon-based cathode and a liquid-free polymer electrolyte, in which the CO2/cathode interfacial chemistry has been thoroughly investigated from both theoretical calculations and experimental analyses. Our all-solid-state Na-CO2 batteries exhibit excellent performance with long cycle life (320 h with a fixed capacity of 1000 mAh g−1), high discharge capacity (&gt;10000 mAh g−1), and energy density (180 Wh kg−1 in pouch cell) at 50 oC.

Designing a novel all-solid-state sodium-carbon dioxide battery

2019 Fall National Meeting

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