Sequestration of CO₂ and recycling spent Li-ion batteries (LIBs) are essential for our society owing to the increased demands for decarbonization and energy/resources conservation. However, conventional CO₂ fixation and LIBs recovery strategy are always accompanied with harsh reaction conditions or complex process. Herein, as an integrated process, CO₂ was designed as a leaching agent to recycle the spent LiFePO₄ at the mild room temperature. Thanks to the weak acidity of H₂CO₃, low leaching of Fe and P elements can guarantee the high extraction selectivity of lithium. Besides as the leaching agent, CO₂ also chemically precipitates the leached Li⁺to produce the value-added Li₂CO₃ product. Further utilizing FePO₄ residue as precursor to synthesize Na₄Fe₃(PO₄)₂P₂O₇ cathodes for Na-ion batteries could achieve a decent electrochemical performance. Life-cycle analysis reveals the currently developed CO₂-leatching strategy enables low energy consumption, reduced greenhouse gas emission and considerable economic profit, showing great application potential.

由于对脱碳和能源​​/资源保护的需求增加，封存 CO ₂和回收废锂离子电池 (LIB) 对我们的社会至关重要。然而，传统的CO ₂固定和LIBs回收策略总是伴随着苛刻的反应条件或复杂的过程。在此，作为一个集成过程，CO ₂被设计为浸出剂，以在温和的室温下回收用过的LiFePO _{4 。由于H 2} CO ₃的弱酸性，Fe、P元素的浸出率低，保证了锂的高萃取选择性。除了作为浸出剂，CO ₂还化学沉淀浸出的锂⁺生产具有附加值的 Li ₂ CO ₃产品。进一步利用FePO ₄残渣作为前驱体合成用于钠离子电池的Na ₄ Fe ₃ (PO ₄ ) ₂ P ₂ O _{7正极可以获得良好的电化学性能。}生命周期分析表明，目前开发的CO ₂浸出策略具有低能耗、减少温室气体排放和可观的经济效益，显示出巨大的应用潜力。