在纳米离子电池中NaK阳极固体电解质接口的组成分析
Mayuresh Janpandit1, Pratahdeep Gogoi1, Xiaoli Ge1
1Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States.
ACS applied materials & interfaces
|January 17, 2024
概括
离子电池中的- (NaK) 液体金属阳极看起来有希望,但形成不稳定的固体电解质介相 (SEI) 层. 添加剂可以改善循环,但溶解仍然是一个挑战.
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:
- 离子电池是离子电池的可持续替代品.
- 离子电池中的阳极遭受着树突形成和不稳定的固体电解质接口 (SEI) 层.
- - (NaK) 液体金属合金阳极提供了一个无树的替代品.
研究的目的:
- 研究NaK阳极和常见电解质之间的相互作用.
- 描述SEI层的形成和降解机制.
- 评估乙烯碳酸盐作为添加剂的有效性.
主要方法:
- 电化学阻抗光谱 (EIS) 用于监测电荷转移电阻.
- 在现场表面增强拉曼光谱 (SERS) 和X射线光电子光谱 (XPS) 用于表面分析.
- 诱导合等离子光学发射光谱 (ICP-OES) 用于电解质分析.
主要成果:
- 与乙烯碳酸/二甲基碳酸电解质的NaK阳极形成不断增长的不稳定的SEI层,导致100个周期内循环失效.
- 表面分析显示,在循环过程中,丰富的阳极表面和溶解到电解质中.
- 10%重量的乙烯碳酸盐添加剂提高了循环性能,达到1C的800个循环,尽管溶解仍然存在.
结论:
- 纳克阳极与标准电解质的相互作用导致SEI不稳定性和溶解.
- 乙烯碳酸盐添加剂部分缓解了SEI问题,并增强了自行车的稳定性.
- 需要进一步的研究来设计更强大的SEI层用于离子电池中的NaK阳极.
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