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描述过渡金属离子溶解对电池离子阳极的影响

Rudy Martin Torres¹, Arumugam Manthiram¹

¹Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78721, USA.

Small (Weinheim an der Bergstrasse, Germany)

|January 29, 2024

概括

离子比或离子在阳极上引起更多的电解质分解. 然而,由此产生的固体电解质介相为阳极提供了更好的保护,与石墨阳极不同.

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:

阳极为离子电池提供高能量密度,但迅速降解.
从阴极中溶解的过渡金属离子可以加速阳极上的电解质分解.
2+,Ni2+和CO2+对阳极的特定影响尚未完全理解.

研究的目的:

研究Mn2+,Ni2+和Co2+离子对阳极降解的差异性影响.
为了比较这些离子存在时形成的固体电解质介相 (SEI) 的保护能力.
为了对比阳极的行为与石墨阳极的行为.

主要方法:

配对一个铁酸盐 (LiFePO4) 阴极和一个氧化 (SiOx) 阳极.
在电解质中引入控制量的Mn2+,Ni2+或CO2+离子.
分析了电极厚度,电解质分解,SEI形成和循环过程中的阻抗.

主要成果:

与Ni2+和Co2+相比,Mn2+离子显著增加了SiOx电极厚度,这是由于电解质分解和SEI形成的增加.
尽管造成了更多的初始降解,但用Mn2+形成的SEI具有较低的阻抗,为Si阳极提供了更好的保护.
Mn2+离子对Si阳极的寿命的影响比CO2+或Ni2+离子要小,这与使用石墨阳极的观察结果相反.

结论:

过渡金属离子对阳极的有害影响与它们对石墨阳极的影响不同.
离子在促进电解质分解的同时,在阳极上形成更具保护性的SEI.
了解这些离子特异效应对于设计稳定的基于的离子电池至关重要.

关键词:

有交叉效应的交叉效应.高氧化物阴极高氧化物阴极离子电池的离子电池阳极是一种阳极.过渡金属的溶解过程

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