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阴极降解产品对离子电池阳极接口的影响

Zhenyu Zhang^1,2,3, Samia Said¹, Adam J Lovett^1,2

¹Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, U.K.

|March 20, 2024

概括

退化的电池阴极中的过渡金属离子通过改变固体电解质介相 (SEI) 来损害阳极性能. 离子会产生不稳定的SEI层,而和离子会降低导电能力,影响离子电池的稳定性.

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
电池技术电池技术

背景情况:

离子电池中的阴极降解会将过渡金属离子释放到电解质中.
这些离子与容量衰减和细胞失效有关,特别是影响阳极的固体电解质介相 (SEI).
了解SEI与这些离子的相互作用至关重要,但在操作细胞中具有挑战性.

研究的目的:

研究特定过渡金属离子 (Ni2+,Mn2+,Co2+) 对SEI特性的影响.
阐明这些离子降低阳极接口稳定性和电池性能的机制.
为开发减轻电池退化战略提供基础知识.

主要方法:

使用电化学原子力显微镜 (EC-AFM) 来研究SEI形态和力学.
使用电化学石英晶体微平衡 (EQCM) 来监测SEI质量变化.
应用电化学阻抗光谱 (EIS) 来评估接口导电性.
引入Ni2+,Mn2+和CO2+离子进入商业电解质进行受控实验.

主要成果:

所有测试过的过渡金属离子 (Mn2+,Co2+,Ni2+) 都会对SEI的形成和稳定性产生负面影响.
2+离子诱导厚,软,不稳定的SEI,导致电池显著退化.
Co2+和Ni2+离子大大降低了界面导电性.
混合过渡金属离子表现出协同作用,放大SEI降解并降低细胞稳定性.

结论:

阴极降解中的过渡金属离子对离子电池的性能和寿命构成重大威胁.
对SEI的具体影响因离子而异,Mn2+会导致结构不稳定,而Co2+/Ni2+会影响电气性能.
混合离子的协同效应加剧了降解,突出显示了电池故障机制的复杂性.
这项研究为设计更强大的电池系统提供了关键的见解,可以抵抗阴极降解产品.

关键词:

这是EC-AFMM.这是NMC NMC的NMC.电化学原子力显微镜电化学原子力显微镜电化学阻抗光谱学电化学阻抗光谱学电化学石英晶体微平衡微平衡过渡金属离子过渡金属离子

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