揭示了Li2O-丰富的固体电解质接口在CoOx嵌入式碳纤维上作为Li阳极主机的现场演变
Zhimin Hao1, Dapeng Liu1, Xintao Zuo1
1Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|July 16, 2024
概括
碳宿主上的金属氧化物会产生富含Li2O的固体电解质接口 (SEI),以获得更好的阳极. 这项研究证实,嵌入碳纳米纤维中的氧化物 (CoO_x) 能够为Li2O形成提供氧气,从而提高稳定性.
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
- 纳米技术纳米技术
背景情况:
- 金属氧化物对3D碳宿主进行修改,有助于形成富含Li2O的SEI.
- 富含Li2O的SEI提供了快速的Li+扩散,并减轻了树问题.
- 由于实验证据有限,SEI中氧气的来源仍然不清楚.
研究的目的:
- 调查CoO_x在富含Li2O的SEI形成中的作用.
- 为SEI中的氧气来源提供实验证据.
- 为了开发高性能阳极主机.
主要方法:
- CoO_x嵌入式碳纳米纤维 (CNF-CoO_x) 的合成.
- 使用18O同位素标记来追踪氧的贡献.
- 电化学测试在半,对称,和全细胞.
主要成果:
- 成功准备CNF-CoO_x作为有效的阳极宿主.
- 18O同位素标记证实了CoO_x作为Li2O的重要氧气来源.
- 由此产生的SEI表现出增强的Li+迁移动力学.
结论:
- 在SEI中,CoO_x在为Li2O形成提供氧气方面发挥着至关重要的作用.
- CNF-CoO_x@Li 阳极表现出极好的循环稳定性.
- 这项工作澄清了富含Li2O的SEI中氧气的来源,并突出了一个有前途的阳极设计.
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