Efficient Direct Recycling of Degraded LiMn2O4 Cathodes by One-Step Hydrothermal Relithiation
Efficient Direct Recycling of Degraded LiMn2O4 Cathodes by One-Step Hydrothermal Relithiation
复制标题
一步水热还原法直接回收降解的LiMn2O4阴极
DOI：
10.1021/acsami.0c15704
复制
发表时间：
2020-11-18
影响因子：
9.5
通讯作者：
Chen, Zheng
中科院分区：
文献类型：
--
作者：
Gao, Hongpeng;Yan, Qizhang;Chen, Zheng
由于日常生活中锂离子电池对储能的巨大需求，以及商业锂离子电池寿命的有限，探索绿色、可持续的回收方法成为缓解废旧锂离子电池带来的环境和经济问题的迫切需要。在这项工作中，我们展示了一种有效的直接回收方法来再生降解的锂锰氧化物(LMO)正极，以恢复其高容量、长时间循环稳定性和高倍率性能，与原始的LMO材料相当。这种一步再生是通过在稀释锂溶液中进行水热反应实现的，能够重建所需的化学计量比和微相纯度，并通过测试不同健康状态的废LIBS进一步验证了这一点。生命周期分析表明，与当今的火法和湿法冶金工艺相比，这种直接再生方法带来了巨大的环境和经济效益。这项工作不仅代表了对废阴极再硫化机理的基本理解，也为能源材料的可持续和闭环回收和再制造提供了一种潜在的解决方案。
Due to the large demand of lithium-ion batteries (LIBs) for energy storage in daily life and the limited lifetime of commercial LIB cells, exploring green and sustainable recycling methods becomes an urgent need to mitigate the environmental and economic issues associated with waste LIBs. In this work, we demonstrate an efficient direct recycling method to regenerate degraded lithium manganese oxide (LMO) cathodes to restore their high capacity, long cycling stability, and high rate perform ance, on par with pristine LMO materials. This one-step regeneration, achieved by a hydrothermal reaction in dilution Li-containing solution, enables the reconstruction of desired stoichiometry and microphase purity, which is further validated by testing spent LIBs with different states of health. Life-cycle analysis suggested the great environmental and economic benefits enabled by this direct regeneration method compared with today's pyro- and hydrometallurgical processes. This work not only represents a fundamental understanding of the relithiation mechanism of spent cathodes but also provides a potential solution for sustainable and closed-loop recycling and remanufacturing of energy materials.