在高能量密度离子电池的NMC811阴极中对Zr兴奋剂的操作调查
Mattia Colalongo1,2, Basit Ali2, Nikita Vostrov1
1ESRF - The European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000, Grenoble, France.
ChemSusChem
|December 9, 2024
概括
兴奋剂稳定了,,,氧化 (NMC811) 阴极材料的结构,通过减少循环过程中的相变和金属溶解来提高离子电池的性能.
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
- 电池技术 电池技术
背景情况:
- ---氧化 (NMC811) 是高能量密度离子电池 (LiBs) 的领先阴极材料.
- 在高工作电压 (>4.2V) 时,NMC811表现出由于结构不稳定性和相位过渡 (H2→H3) 的容量色.
研究的目的:
- 研究 (Zr) 兴奋剂增强NMC811.1的电化学性能的机制.
- 了解在共同沉合成步骤中加入Zr的好处.
主要方法:
- 操作X射线衍射 (XRD) 来监测循环过程中的结构变化.
- 现场X射线吸收光谱 (XAS) 用于分析元素和电子状态.
- 对Zr-doped NMC811.11的共同沉合成方法.
主要成果:
- Zr兴奋剂有效地抑制了NMC811.11中不必要的H3相的形成.
- 在电化学循环过程中过渡金属的溶解被Zr兴奋剂显著缓解.
- 观察到Zr-doped NMC811的增强结构稳定性和电化学性能.
结论:
- 采用Zr兴奋剂是一种可行的策略,可以提高NMC811阴极材料的循环稳定性和性能.
- 共同沉方法有效地将Zr引入NMC811结构,从而改善了电池的寿命.
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