Li2SeO4涂层与电子结构调节相结合,以稳定Mo-化无高阴极材料
Dandan Sun1, Xin Zhang1, Jiyuan Jian1
1State Key Laboratory of Space Power Sources, MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.
ACS applied materials & interfaces
|October 27, 2025
概括
兴奋剂和Li2SeO4表面修饰增强了没有的高阴极. 这一策略提高了先进的离子电池的循环稳定性和速率能力.
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:
- 没有的高层正极材料提供高能量密度,但由于接口和机械问题,其循环稳定性较差.
- (Mo) 兴奋剂提炼了粒子大小,减少了应力,但增加了表面积,加剧了界面不稳定性.
研究的目的:
- 为了提高无高层正极材料的循环稳定性和速率能力.
- 通过表面修饰来解决LiNi0.95Al0.04Mo0.01O2 (NiAlMo) 的界面和机械不稳定性.
主要方法:
- 在LiNi0.95Al0.04Mo0.01O2 (NiAlMo) 上通过高温反应合成的Li2SeO4表面修饰.
- 研究了微结构调制和表面修改对正极性能的影响.
主要成果:
- 经过修改的NiAlMo-Li2SeO4 (NiAlMo-Se) 阴极在2.7-4.5V范围内表现出极好的容量保留 (85.2%在100个循环后).
- 在0.1°C时达到248.2 mAh/g的高容量,在0.5°C时达到224.2 mAh/g.
- 显著提高了速率能力,在5°C时达到178.6 mAh/g,在10°C时达到154.4 mAh/g.
结论:
- Li2SeO4表面修饰有效地抑制了副产品的过度生长,并减轻了结构性降解.
- 同时增强机械强度和表面稳定性是稳定高层阴极的可行策略.
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