地方电子调节Na5V12O32阴极抑制结构扭曲向增强的储存
Xuexia Song1,2,3, Jingjing Wang1,2, Wenbin Li4,5
1Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, China.
Nature communications
|December 3, 2025
概括
本研究通过调整电子结构,为离子电池引入稳定的KxNa5-xV12O32阴极. 它增强了用于先进电池应用的能量密度和循环稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高压分层氧化物阴极对于离子电池至关重要,但面临稳定性挑战.
- 稳定这些阴极是解锁高能量和功率密度的关键.
研究的目的:
- 为离子电池设计稳定的高压KxNa5-xV12O32阴极.
- 通过K替代通过相位和氧气空缺的协同调来阐明稳定机制.
主要方法:
- 通过Na到K的替代,对不可逆相和氧空缺的协同调.
- 使用K替代的电子结构修改的阐明.
- 对KxNa5-xV12O32阴极进行电化学性能测试.
主要成果:
- 在KxNa5-xV12O32中的K替代增强了V 3d-O 2p杂交和V 3d轨道电子移位.
- 这导致了增强的电荷分布,加强了V3O8结构,改善了电子转移动力学,并抑制了不可逆转的相位过渡.
- K0.147Na4.853V12O32阴极提供250.1 mAh g-1 (1.5-4.3 V vs. Na/Na+),将平均电压提高到4.3 V,并显示出出色的循环稳定性 (在1000个循环后保持98.2%).
结论:
- 该K替代策略有效地稳定了离子电池的高压基阴极.
- 电子结构调制是开发高能量密度和稳定的正极材料的可行方法.
- 这项工作为先进的离子电池技术铺平了道路.
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