了解由于结构降解而色的容量,在普鲁士蓝色类似的宽温度离子圆柱形电池中
Hang Zhang1,2, Jiayang Li2, Jinhang Liu3
1Institute for Carbon Neutralization Technology, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, PR China.
Nature communications
|March 14, 2025
概括
低成本的普鲁士蓝色类似的离子电池由于结构变化而退化. 一项新的战略提高了它们在广泛的温度范围内的稳定性和性能,为商业用途铺平了道路.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于铁的普鲁士蓝色类似物 (PBA) 是用于离子电池 (SIB) 的低成本阴极材料.
- 然而,它们的商业化受到循环过程中显著的容量退化和能量损失的阻碍.
- 导致PBA产能下降的确切机制尚不清楚.
研究的目的:
- 阐明SIBs的Fe-based PBA产能降低的根本原因.
- 制定双重监管战略,以减轻这些退化问题.
- 为了评估修改后的PBA在实际电池电池中的电化学性能.
主要方法:
- 在PBA循环过程中研究了不可逆转的相位过渡,结构降解,表面氧化还原中心失活以及过渡金属离子溶解.
- 采用双重监管策略来解决已识别的降解途径.
- 使用修改的PBA和硬碳阳极制造和测试了18650/33140圆柱形电池.
主要成果:
- 确定了不可逆转的相位过渡的持续积累,结构性降解,表面氧化还原中心的关闭和过渡金属离子溶解作为关键的降解因素.
- 证明这些变化导致显著的形态破坏和容量衰退.
- 在经过修改的PBAs的细胞中获得了更好的循环稳定性和广泛温度 (-40°C至100°C) 的性能.
结论:
- 解决了关于SIB中PBA阴极降解的起源的争议.
- 强调了抑制不可逆转的晶体/结构变化的关键重要性,以提高循环稳定性.
- 证实了PBA作为商业SIB应用的可行阴极材料的重大潜力.
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