基于喷雾热解技术的废锂离子电池单晶正极再生闭环,Green Chemistry

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基于喷雾热解技术的废锂离子电池单晶正极再生闭环
Green Chemistry ( IF 9.3 ) Pub Date : 2023-04-20 , DOI: 10.1039/d3gc00197k
Tao Li ₁ , Yongchao Zhou ₁ , Ziyu Chen ₁ , Yan Li ₁

Affiliation

废旧锂离子电池 (LIB) 的回收是一个新兴的全球问题。目前的回收技术通常包括多次净化操作，涉及使用大量化学品，这在经济和环境效益方面都损害了它们的竞争力。在此，我们提出了一种基于喷雾热解技术的闭环，用于从废 LIBs 中再生单晶阴极，可以同时实现 Li 和过渡金属（TMs）的分离，并获得用于合成单晶的高质量前驱体阴极。作为示例性研究，用过的 LiCoO ₂首先通过氯化过程转化为氯化物。超过 95% 的 Li 通过“喷雾热解-水浸出”工艺选择性浸出。同时，Co ₃O ₄浸出渣可直接用作合成高性能单晶LiCoO ₂的前驱体，而热解过程中产生的气态HCl可循环用于氯化过程。因此，这种Li、Co和Cl的闭环技术具有巨大的经济效益，因为它摆脱了复杂的纯化操作和前驱体制备过程（如共沉淀），为锂离子电池的回收开辟了一条新途径。

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Spray pyrolysis technology-based closed-loop for regenerating single-crystal cathodes from spent lithium-ion batteries

Recycling of spent Li-ion batteries (LIBs) is an emerging global concern. Current recycling technologies generally include multiple purification operations and involve the use of lots of chemicals, which compromise their competitiveness in terms of both economic and environmental benefits. Herein, we propose a spray pyrolysis technology-based closed-loop for regenerating single-crystal cathodes from spent LIBs, which could simultaneously achieve the separation of Li and transition metals (TMs) and obtain high-quality precursors for the synthesis of single-crystal cathodes. As an exemplary study, spent LiCoO₂ is first converted into chlorides through a chlorination process. More than 95% of Li is selectively leached out by the “spray pyrolysis–water leaching” process. Simultaneously, the Co₃O₄ leaching residue could be directly used as a precursor for synthesizing high-performance single-crystal LiCoO₂, while the gaseous HCl produced in the pyrolysis process could be recycled in the chlorination process. Therefore, this closed-loop of Li, Co, and Cl holds great economic benefits as it gets rid of the complicated purification operations and precursor preparation processes (such as coprecipitation), opening a new avenue for LIBs recycling.

更新日期：2023-04-20

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