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Annealing 对直接回收的 NMC 阴极的影响
Juliane I Preimesberger1, Cyrus K Kirwa1,2, Eva Allen3
1Materials, Chemical, and Computational Science Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States.
概括
电动汽车电池的直接回收至关重要. 重石化和化恢复了退化的,,氧化物 (NMC) 622阴极,保持了可持续的电动汽车电池回收的结构和特性.
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:
- 电动汽车 (EV) 电池的使用寿命即将结束,因此需要有效的回收方法.
- 直接回收保存材料结构,比传统工艺提供优势.
- 再化和回火是直接回收氧化 (NMC) 阴极的关键步骤.
研究的目的:
- 为了研究降解和重新化NMC 622.2的化机制.
- 了解直接回收后NMC 622的结构和电化学恢复.
- 为了评估热温度对NMC 622特性恢复的影响.
主要方法:
- 同步射线X射线衍射 (XRD) 技术
- 尼的X射线吸收靠近边缘结构 (XANES)
- 扫描传输电子显微镜 (STEM) 的使用
- 化学复合和高温回火的化学复合和高温回火
主要成果:
- 重石化重建了退化的NMC 622.2的表面.
- 需要高火温度 (720°C) 才能完全恢复NMC 622的结构.
- 单纯的回火就足以恢复电化学和结构性质.
- 颗粒的孔隙性和形态在很大程度上不受回收过程的影响.
结论:
- 高温回火对于直接回收NMC 622的结构恢复至关重要.
- 直接回收策略可以有效地恢复退化的NMC 622阴极的关键性质.
- 了解回火效应对于优化直接EV电池回收过程至关重要.
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