对于丰富的阴极材料的氧气空隙的热力学控制
Yongqi Sun1,2, Gui Chu3, Xiaobo Zhu3
1School of Metallurgy and Environment and National Center for International Research of Clean Metallurgy, Central South University, Changsha, 410083, China.
Angewandte Chemie (International ed. in English)
|December 8, 2025
概括
我们开发了一种新方法来控制富层氧化物 (LRLOs) 中的氧空缺 (OVs),以获得更好的离子电池. 这种工程方法显著提高了电池容量和性能.
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
- 固态化学 固态化学
背景情况:
- 氧空隙 (OV) 对于调整氧化物特性至关重要,但很难控制.
- 富层氧化物 (LRLOs) 是先进的离子电池的有希望的阴极材料.
研究的目的:
- 提出一个精细的工程方法来调节LRLOs中的氧气空缺.
- 通过控制氧气部分压力来实现OV度的准确和广泛调整.
主要方法:
- 使用Mn-O二进制相位图来指导这个过程.
- 在化过程中采用了金学CO/CO2气体对来精确控制氧气部分压力 (PO2) .
- 在超高Mn LRLO模型中量化了OV度和PO2范围 (10-0.7-10-10.0 atm) 之间的热力学平衡.
主要成果:
- 演示了渐进的格子扩张和增强的Li@Mn6超结构与增加的OVs.
- 与参考样本 (28.5 mAh g-1) 相比,优化LRLO的3.8 mol % OVs (175.9 mAh g-1在0.1C) 的初始放电容量提高了六倍.
- 达到了287.9mAh的最大容量g-1并澄清了OVs在修改易离子氧化回氧的电子结构中的作用.
结论:
- 在LRLOs中开发了一种可通用和易于使用的氧气空缺工程策略.
- 这种方法加速了下一代离子电池LRLOs的商业可行性.
- 为其他先进的氧化物材料的合理设计提供了一个新的框架.
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