通过调节离子电池的氧氧还氧化活性来稳定层结构氧化物阴极
Wei Li1, Qingsong Lai1, Xuan-Wen Gao1,2
1Institute for Energy Electrochemistry and Urban Mines Metallurgy, School of Metallurgy, Northeastern University, Liaoning, 110819, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 3, 2024
概括
将硫离子引入离子电池阴极可以提高稳定性. 这种修改通过抑制氧气释放,改善了层结构氧化物中的循环寿命和容量保留.
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:
- 层结构氧化物是离子电池 (SIB) 的有希望的阴极,因为它们具有离子氧化还原活性.
- 然而,过量的氧氧还氧反应会导致不可逆转的氧气释放,降低循环稳定性.
研究的目的:
- 为了提高O3-NaNi0.3Mn0.5Cu0.1Ti0.05W0.05O2阴极的循环稳定性和电化学性能.
- 调查硫离子兴奋剂在抑制氧气损失和改善可逆性的作用.
主要方法:
- 使用高温火方法将硫离子引入O3-NaNi0.3Mn0.5Cu0.1Ti0.05W0.05O2结构中.
- 进行了电化学表征,包括循环测试和速率能力测量.
- 结构分析的重点是稳定的S-O共价键的形成.
主要成果:
- 一种新的Na2S修饰的O3/P2-NaNi0.3Mn0.5Cu0.1Ti0.05W0.05O2复合物被成功合成.
- 修改后的阴极表现出高可逆容量173.1 mAh g-1在1.5-4.3 V之间在0.1 C.
- 在1°C的120个循环后,实现了81.5%的容量保留,以及良好的速率能力.
结论:
- 硫离子兴奋剂有效地提高了氧化减氧反应的可逆性,并抑制了晶格氧气损失.
- 稳定的S-O共价键在抑制氧气释放方面发挥着至关重要的作用.
- 经Na2S改性复合材料显示出作为SIB的高性能阴极材料的巨大潜力.
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