对于高能量密度离子电池的高容量阴极,离子共氧化诱导高容量阴极
Bing Zhang1,2, Haoqing Ma1, Feng Tao1
1Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000 P.R. China 211808@whut.edu.cn.
RSC advances
|April 23, 2025
概括
用于离子电池 (SIB) 的新型铁/基阴极表现出增强的性能. 使用Li+和Mg2+的兴奋剂激活氧氧还原并改善高能SIB的循环稳定性.
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:
- 多层过渡金属氧化物是离子电池 (SIB) 的有希望的阴极,因为它们的容量高,元素丰富.
- 挑战包括循环过程中的相位转换和容量色,阻碍实际应用.
研究的目的:
- 为SIB开发一种新的P2型阴极材料,以提高电化学性能.
- 调查离子和离子氧化还原剂在增强电池容量和稳定性的作用.
主要方法:
- 一种新的P2型Na0.73Fe0.2Mn0.52Co0.2Mg0.05Li0.03O2 (P2-NFMO-CoMgLi) 阴极材料的合成.
- 电化学表征包括静电循环和现场XPS分析.
- 使用Li+,Mg2+和Co2+调整材料属性的兴奋剂策略.
主要成果:
- P2-NFMO-CoMgLi阴极在20 mA g-1下显示了178 mA hg-1的高容量.
- 在200 mA g-1的150个循环中实现了68%的容量保留,这表明循环稳定性得到了增强.
- 现场XPS证实了氧氧还氧化活性,有助于提高高压能力.
结论:
- 合理的+和Mg2+的化剂激活可逆氧氧氧还原,并抑制有害的相位转换.
- 加入二氧化碳增强了特定容量,并稳定了TM-O结合.
- 该研究通过了解阴离子-离子氧化还原机制,推进了高能量密度SIB的设计.
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