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动态Li+通过链相互作用捕获,用于再生耗尽的LiFePO4阴极

Xin-Xin Zhao¹, Xiao-Tong Wang², Jin-Zhi Guo²

¹Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|January 4, 2024

概括

本研究介绍了一种可持续的方法,用于利用 Zn 复合物再生耗尽的铁酸盐 (LFP) 电池. 电化学修复增强了结构稳定性和可逆性,提高了电池性能,并使环保回收成为可能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
可持续能源可持续能源

背景情况:

从电动汽车中使用的铁酸盐 (LFP) 电池,由于经济和环境的限制,造成了回收的挑战.
退役期间不可逆转的相位变化和结构退化阻碍了直接的再生.
不当存储导致的变形进一步使LFP电池的恢复复杂化.

研究的目的:

提出一种可持续的电化学修复方法,用于再生耗尽的LFP电池.
为了研究使用连接链Zn-复合物 (ZnDEA) 作为结构调节剂.
提高LFP电池回收的效率和可行性.

主要方法:

在电化学修复过程中利用连接链Zn-复合体 (ZnDEA) 调节LFP结构.
采用Zn复合物的动态协调,在充电和放电周期期间结合过渡金属离子 (Fe3+和Zn2+).
在LFP框架内调制体积变化,以改善离子储存和相位过渡可逆性.

主要成果:

恢复的LFP框架显示了增强的离子存储能力和LFP和FePO4 (FP) 阶段之间的更好的可逆性.
在再生细胞中观察到改变的初始库伦比克效率和减少的极化电压差异.
在2°C下1500个循环后,回收的LFP电池保持了96.30%的容量,这表明长期稳定性很好.

结论:

链修复机制有效地促进了结构演变,并促进了LFP电池中的离子迁移.
这种有针对性的离子补偿策略为环保和实用的LFP电池回收提供了一个有希望的方法.
这项研究为克服结构性退化提供了有价值的见解,以有效地再生电池.

关键词:

在 LiFePO4 阴极.动态 Li 的补偿.连带链修复的修复方法使用过的离子电池.可持续的恢复是可持续的恢复.

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