一个定制的策略实现了大容量和高压分层阴极的稳定周期,用于离子电池
Bo Peng1,2, Zihao Zhou2, Ji Shi2
1College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.
Angewandte Chemie (International ed. in English)
|September 19, 2024
概括
微量兴奋剂增强了离子电池的P2-Na0.67Ni0.33Mn0.67O2阴极. 这种定制策略提高了稳定性和能量密度,克服了先进电池应用的关键限制.
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P2-Na0.67Ni0.33Mn0.67O2分层氧化物为离子电池提供高能量密度.
- 这些阴极面临着大容量相位过渡和稳定性-容量权衡的挑战.
研究的目的:
- 为了解决P2-Na0.67Ni0.33Mn0.67O2阴极中的稳定性-容量权衡问题.
- 通过定制的微量兴奋剂策略,提高离子电池阴极的性能.
主要方法:
- 多种形成岩石的元素 (Mg-Al-Ti) 用于对P2-Na0.67Ni0.33Mn0.67O2阴极进行微量注.
- 评估了电化学性能,包括容量,能量密度和循环稳定性.
- 通过多种表征来研究故障机制.
主要成果:
- Mg-Al-Ti 合阴极实现了 140.3 mAh g-1 的容量和接近 500 Wh kg-1 的能量密度.
- 化阴极表现出良好的循环稳定性,在0.1°C的50个循环后保持89.0%的容量.
- 一个带有硬碳阳极的完整电池达到303.3Wh kg-1的能量密度.
- 兴奋剂抑制了岩盐转化和粒内裂的层,增加了滑动能量屏障.
结论:
- 用Mg-Al-Ti进行定制的微量兴奋剂有效地减轻了大体积相位过渡,并提高了高压P2-Na0.67Ni0.33Mn0.67O2阴极的稳定性.
- 该策略可扩展到其他兴奋剂系统,如Mg-Fe-Ti.
- 这项研究为设计高能离子电池阴极提供了一种新的方法.
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