Large energy is required for traditional CO₂ fixation, leading to more CO₂ emission and additional pollutants. Recently, integrating renewable energy with CO₂ fixation has attracted increasing attention as a sustainable strategy. Here, based on a systematic investigation on aprotic Li-CO₂ electrochemistry, we first provide an alternative strategy for either CO₂ fixation or energy storage. Both strategies share the same CO₂ reduction process with the formation of Li₂CO₃ and carbon. Subsequently, CO₂ fixation is achieved through a rechargeable/irreversible oxidation process, during which Li₂CO₃ is decomposed, while the carbon obtained remains fixed. Moreover, a reversible Li-CO₂ battery system has been realized based on co-oxidization of the resulting carbon and Li₂CO₃ using a Ru catalyst. Consequently, by shedding light on the fundamental reaction mechanism of aprotic Li-CO₂ electrochemistry, the proof of concept presented here provides strong theoretical underpinning for developing flexible routes for both CO₂ fixation and Li-CO₂ energy storage.

传统的CO ₂固定需要大量的能量，导致更多的CO ₂排放和更多的污染物。近来，将可再生能源与CO ₂固定结合起来作为一种可持续的策略已引起越来越多的关注。在此，基于对质子惰性Li-CO ₂电化学的系统研究，我们首先为CO ₂固定或能量存储提供了另一种策略。两种策略在形成Li ₂ CO ₃和碳时具有相同的CO ₂还原过程。随后，通过可充电/不可逆的氧化过程实现CO ₂固定，在此过程中，Li ₂CO ₃分解，同时获得的碳保持固定。此外，基于使用Ru催化剂对所得碳和Li ₂ CO _3的共氧化，已经实现了可逆Li-CO ₂电池系统。因此，通过阐明非质子性Li-CO ₂电化学的基本反应机理，本文提出的概念证明为开发灵活的CO ₂固定和Li-CO ₂能量存储途径提供了强有力的理论基础。