通过在表面上自发形成的Yb和氧空隙丰富层来稳定丰富的多层氧化物阴极
Quan Li1,2, Hong Wang1,2,3, Guan Wang1,2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 12, 2023
概括
痕迹兰他化物Ytterbium (Yb) 兴奋剂稳定了丰富的多层氧化物 (LLO) 阴极. Yb兴奋剂形成了一层保护性表面层,并加强了散装结构,增强了循环稳定性和离子扩散,以提高电池性能.
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:
- 富层氧化物 (LLOs) 具有高的特定容量,使其成为先进电池的有希望的阴极材料.
- 由于循环过程中结构性降解造成的容量衰减和电压歇斯底里,LLOs的商业应用受到阻碍.
- 表面工程和元素兴奋剂是改善LLO稳定的常见策略.
研究的目的:
- 研究微量 (Yb) 兴奋剂对丰富层氧化物 (LLO) 的结构稳定性和电化学性能的影响.
- 阐明Yb兴奋剂减轻LLO阴极结构降解并增强循环稳定的机制.
主要方法:
- 合成富含的分层氧化物 (Li1.2 Mn0.54 Co0.13-x Ybx Ni0.13 O2,x=0.003),并添加微量伊特 (Yb).
- 表面层和散体结构的表征,包括氧气空隙形成和晶格稳定.
- 电化学测试以评估循环稳定性,容量保留和离子扩散特性.
主要成果:
- Yb兴奋剂自发地形成了表面富含Yb的层,具有高密度的氧气空缺,减轻氧气损失和相位过渡.
- 嵌入的Yb离子增强了与氧的结合能量,在循环过程中稳定了LLO晶格结构.
- LLO-0.3% Yb阴极表现出显著改善的循环稳定性,在100个循环 (0.2C) 后保持84.69%的容量,在200个循环 (1C) 后保持84.3%.
结论:
- 痕迹Yb兴奋剂提供了一种双效应策略,结合了表面工程和散装格子稳定,以提高LLO阴极性能.
- 这种罕见的元素兴奋剂方法有效地减轻了结构降解,并促进了离子扩散,为高稳定性LLO阴极铺平了道路.
- 这些发现突出了Yb兴奋剂作为开发下一代高性能离子电池阴极材料的可行方法的潜力.
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