在高性能离子电池中对分层氧化物采用双金属联合兴奋剂策略
Wei Lin1, Wenxue Min1, Qimeng Zhang1
1Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Journal of colloid and interface science
|September 12, 2025
概括
Sb/Al联合剂增强了用于离子电池的O3型层氧化物. 这种新的NMSA材料展示了改进的循环稳定性和动力学,为先进的高能电池阴极铺平了道路.
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:
- O3型层氧化物是离子电池的有希望的阴极材料,因为它们的合成容易和理论容量.
- 关键的挑战包括循环稳定性差,动力学缓慢,阻碍实际应用.
- 过渡金属氧化物 (TMO2) 层的稳定性和相位过渡是关键因素.
研究的目的:
- 为离子电池开发一种稳定,高性能的正极材料.
- 调查Sb/Al联合兴奋剂对O3型层氧化物的结构,电化学和界面特性的影响.
- 了解离子动力学和电荷补偿机制.
主要方法:
- 在Sb/Al联合合材料NaNi0.48Mn0.49Sb0.01Al0.02O2 (NMSA) 材料的Sol-gel合成中.
- 使用循环电压测量 (CV) 和静电间歇定位技术 (GITT) 进行电化学表征.
- 通过现场X射线衍射 (XRD) 进行结构分析,并使用现场X射线光电谱 (XPS) 进行表面分析.
主要成果:
- 化剂增强了TMO2层的稳定性,抑制了不可逆转的O3-P3相变,改善了循环寿命.
- Sb化增加了参与电荷补偿的离子,提高了排放特定容量.
- 在1°C的100个循环后,NMSA材料在0.1°C达到128.5 mAh g-1和85%的容量保留.
结论:
- Sb/Al共是一种有效的策略,可以提高O3型离子电池的层叠氧化物阴极的性能.
- 该NMSA材料表现出卓越的周期稳定性,动力学和容量保留.
- 这项工作为设计高能离子电池的先进阴极材料提供了洞察力.
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