在NMC811阴极的水性和直接回收过程中的工艺条件的影响
Felix Nagler1, Leonhard Kolb1, Nino Christian1
1Fraunhofer R&D Center Electromobility, Fraunhofer Institute for Silicate Research, Neunerplatz 2, 97082, Würzburg, Germany.
ChemSusChem
|November 14, 2024
概括
直接回收NMC811等离子电池阴极,需要仔细控制工艺条件. 水性回收可能导致污染,影响性能,需要优化方法来有效地回收材料.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 可持续的储能依赖于有效回收使用过的离子电池中的关键材料.
- 水性,直接回收利用为回收像LiNi0.8Mn0.1Co0.1O2 (NMC811) 这样的阴极材料提供了一个有希望的途径.
- 了解工艺条件对正极表面化学的影响,对于成功回收至关重要.
研究的目的:
- 研究不同水性循环过程条件对NMC811阴极表面化学和电化学性能的影响.
- 为了确定直接回收过程中污染的机制.
- 评估减轻NMC811回收的有害影响的策略.
主要方法:
- 采用了三个模拟不同水性回收场景的模型系统.
- 在不同条件下的NMC811表面化学分析,包括片的存在和pH调整.
- 对回收NMC811材料进行电化学性能测试.
- 通过热处理模拟再生,以评估结构变化.
主要成果:
- 在的存在下,水处理会导致含的物种沉积在NMC811表面上,特别是在pH值升高的情况下.
- 污染会增加两极分化,并对电化学性能产生负面影响.
- 添加酸 (H3PO4) 通过控制pH,有效地减轻了的腐蚀.
- 在再生期间的热处理可能会导致阴离子混合,因为表面物种集成到NMC811散体中.
结论:
- 水性循环过程中的工艺条件极大地影响NMC811表面化学和性能.
- 污染是直接水循环的重大挑战,需要控制pH值.
- 优化回收协议对于防止有害的表面修改和确保有效的材料再生至关重要.
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