加强稳定离子电池的分层氧化物阴极中的过渡金属-氧相互作用
Junyi Dai1, Jiahao Li2, Yu Yao1
1Hefei National Research Center for Physical Sciences at the Microscale, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China. Hefei, Anhui 230026, China.
ACS nano
|March 11, 2025
概括
一个新的Zn和Al代策略增强了离子电池 (SIB) 的P2型分层氧化物阴极. 这种方法提高了结构稳定性和可逆的氧氧还氧反应,从而提高了能量密度和循环能力.
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:
- 由于其高理论能量密度,P2型层氧化物是离子电池 (SIB) 的有希望的阴极材料.
- 循环稳定性问题,包括相位过渡和不可逆转的晶格氧氧氧还氧反应,限制了它们的实际应用.
研究的目的:
- 开发一种稳定,高性能的阴极材料,用于SIB,使用Zn和Al的配合染策略.
- 研究Zn和Al配合改善P2型层氧化物的电化学性能和结构完整性的机制.
主要方法:
- 合成一种 Zn 和 Al 编的 P2 型层氧化物,Na$_{0.71}$Ni$_{0.28}$Zn$_{0.05}$Mn$_{0.62}$Al$_{0.05}$O$_{2}$ (ZA-NNMO).
- 几何相位分析以研究格子扭曲和离子迁移.
- 在现场微分电化学质谱 (DEMS) 验证氧氧还氧反应.
主要成果:
- 兴奋剂有效地减轻了晶格扭曲和过渡金属离子迁移,抑制了有害的相位过渡.
- 胺兴奋剂增强了Al-O相互作用,促进了可逆的氧氧氧化还原反应,并减少了不可逆的氧氧化.
- 在ZA-NNMO阴极实现了3.6V的高输出电压,能量密度为470Whkg$^{-1}$,并在1400个循环后保持80.2%的容量.
结论:
- 和的编码是一种强大的策略,可以增强SIB的P2型层氧化物阴极的稳定性和可逆性.
- 开发的ZA-NNMO阴极表现出卓越的电化学性能,使其成为下一代离子电池的可行候选者.
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