摩化剂用于修改LiNi0.9Co0.05Mn0.05O2阴极的晶格和形态,以实现高效的离子储存
Liang Qiao1, Qi You1, Xinyuan Wu1
1College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China.
ACS applied materials & interfaces
|January 20, 2024
概括
兴奋剂增强了富含,缺乏的离子电池阴极的稳定性和性能. 改性材料显示出更好的容量保留和更快的离子扩散,用于下一代电池.
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:
- 富含,缺乏的分层氧化物 (LiNiCoMn1-O2,x ≥0.9) 由于其高容量和低成本,对下一代离子电池具有前景.
- 结构不稳定性和缓慢的Li动力学限制了这些阴极材料的实际应用.
研究的目的:
- 研究 (Mo) 兴奋剂对LiNi0.9Co0.05Mn0.05O2 (NCM90) 的结构稳定性和电化学性能的影响.
- 为了提高NCM90的循环稳定性和速度能力,用于先进的离子电池.
主要方法:
- 合成Mo-dopedNCM90阴极材料的合成.
- 使用分析晶体结构,相变和粒子形态学的技术进行表征.
- 电化学测试,包括循环性能和速率能力测量.
主要成果:
- 莫剂有效地稳定了晶体结构,在相位过渡期间减轻了晶格应变,并防止了粒子粉碎.
- 经过0.5°C的200个循环后,Mo修改NCM90 (NCM90-1%Mo) 的容量保持率为85.9%,比原始NCM90.0提高了23.8%.
- NCM90-1%Mo样本显示了增强的Li+扩散和高放电容量150mAhg-1在5C.
结论:
- 兴奋剂是一种可行的策略,可以提高丰富的多层阴极材料的结构完整性和电化学性能.
- 经过MO修改的NCM90为下一代离子电池开发高性能,稳定的阴极材料提供了有前途的途径.
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