3+兴奋剂对脊柱的作用 LiMn O 形态和电化学性能
Zhengqing Pei1, Jiawei Wang1,2, Haifeng Wang1,2
1School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.
International journal of molecular sciences
|January 8, 2025
概括
兴奋剂增强了离子电池的氧化 (LiMn2O4) 阴极材料,提高了高温下的稳定性和循环寿命. 这种Cr-doped的LiMn2O4表现出优越的电化学性能和容量保留.
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
- 无机化学 无机化学 有机化学
背景情况:
- 氧化 (LiMn2O4) 是离子电池的经济高效和环保的阴极材料.
- 高温容量降解和短周期寿命限制了LiMn2O4.4的应用.
- 3+离子中的Jahn-Teller效应有助于结构不稳定性和性能下降.
研究的目的:
- 为了提高LiMn2O4阴极材料的电化学性能和热稳定性.
- 合成和表征添加的LiMn2O4 (LiCrxMn2-xO4) 具有增强的特性.
- 研究Cr3+替代对LiMn2O4.4的晶体结构,形态和电化学行为的影响.
主要方法:
- 使用液相共同沉和化合成了一系列LiCrxMn2-xO4样本 (x = 00.06).
- 结构特征证实了带有截断的八面体形态的旋转结构的形成.
- 通过在各种温度和电流密度下进行循环测试来评估电化学性能.
主要成果:
- 化导致了稳定的旋结构和独特的多面体形态.
- Cr3+替代Mn3+增强了晶体结构的稳定性,并由于较高的Cr-O键能抑制了Jahn-Teller效应.
- 优化的LiCr0.04Mn1.96O4显示出极好的容量保留:在500个循环 (0.5C) 后93.24%,在50°C (0.5C) 的350个循环后86.46%.
结论:
- 兴奋剂是一种有效的策略,可以提高LiMn2O4阴极材料的电化学性能和热稳定性.
- 改进的稳定性和抑制的Jahn-Teller效应有助于卓越的骑自行车性能.
- 添加的LiMn2O4为开发高性能离子电池提供了一个有前途的途径.
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