阴离子/离子辅助兴奋剂提高了单晶丰富的Mn基阴极的氧氧还原可逆性和结构稳定性,以实现广泛的温度性能
Biru Eshete Worku1,2, Yang Lu3, Mingzhi Song4
1State Key Laboratory of Biopharmaceutical Preparation and Delivery, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
Small (Weinheim an der Bergstrasse, Germany)
|April 24, 2025
概括
和的联合剂增强了丰富的基于的正极材料 (LRMs),用于下一代离子电池. 这提高了氧氧还氧化可逆性和结构稳定性,提高了室内和低温的性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 富含的基于的正极材料 (LRM) 为下一代离子电池提供高能量密度.
- 由于氧气释放和结构降解,LRM面临诸如电压衰变,低速率能力,低循环能力和低温下容量损失等挑战.
研究的目的:
- 为了提高LRM在室温和低温的电化学性能.
- 为了提高氧氧还氧化可逆性和LRMs的结构稳定性.
主要方法:
- 将Al和F联合化成新型的单晶Li1.2Mn0.54Ni0.13Co0.13O2. 这种化方法可以使单晶Li1.2Mn0.54成为新型的单晶Li0.13.
- 对氧氧还原对和电子结构的研究.
主要成果:
- 在循环后,Al和F联合合电极 (LRMAF) 保留了更多的网状氧气 (O2−) 和Mn4+.
- LRMAF表现出高能量密度 (1185 Wh kg−1),初始放电能力 (329 mAh g−1 在0.1C),优秀的速率能力 (155 mAh g−1 在5.0C),和88%的容量保留100个循环后.
- 在-20°C时观察到显著的电化学性能.
结论:
- 和联合兴奋剂有效地促进氧氧还原可逆性,并增强LRMs的结构稳定性.
- 单晶形态和阴离子/离子共的结合导致在广泛的温度范围内的优越电化学性能.
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