现场二氧化碳的化学起源来自离子失序岩盐阴极的排气
Tzu-Yang Huang1,2, Zijian Cai3,4, Matthew J Crafton1,2
1Department of Chemical and Biomolecular Engineering, University of California-Berkeley, Berkeley, California 94720, United States.
概括
离子电池 (LiBs) 释放的二氧化碳 (CO2) 与碳添加剂有关. 电解质溶剂的分解和黑碳的氧化是二氧化碳的关键来源,来自乱的岩盐阴极.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 电池技术 电池技术
背景情况:
- 现场二氧化碳 (CO2) 排气是离子电池 (LiBs) 中的一个已知的问题,通常来自阴极-电解质接口上的寄生反应.
- 从新兴的过量阴离子失序岩盐 (DRX) 阴极释放的二氧化碳的特定化学来源仍然在很大程度上未被探索.
研究的目的:
- 在电池循环过程中,从过量扰乱岩盐 (DRX) 阴极释放的现场二氧化碳的化学起源进行调查.
- 阐明碳添加剂和电解质分解在LiBs中的二氧化碳生成中的作用.
主要方法:
- 在Li1.2Mn0.4Ti0.4O2 (LMTO) DRX阴极内使用了碳源的13C同位素标记.
- 使用微分电化学质谱法 (DEMS) 与碳酸盐基电解质中的静电循环相结合.
主要成果:
- 电解质溶剂 (EC) 分解被确定为LMTO阴极充电期间二氧化碳的主要来源.
- 来自EC的CO2与碳黑添加剂的表面积相关,突出了它们在电解质降解中的作用.
- 第一个周期中不寻常的双模二氧化碳演变被归因于碳黑氧化.
结论:
- 现场二氧化碳释放的化学来源在DRX阴极中取决于电压和循环.
- 这些发现为提高 LiBs DRX 阴极的稳定性提供了关键的见解.
- 这项研究可以指导未来的材料设计,以减轻DRX电池中的寄生反应.
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