探索具有超高速率性能的高缩层氧化物,用于离子电池
Yizhong Chi1, Hongkun Tan1, Chao Xu2
1School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
ACS applied materials & interfaces
|December 5, 2025
概括
高设计增强了离子电池的O3型分层氧化物,提高了空气稳定性和循环性能. 这种方法解决了相位过渡和结构退化,为先进的电池材料铺平了道路.
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
背景情况:
- O3型层氧化物是离子电池的有希望的阴极材料,因为它们很容易合成和含量很高.
- 然而,由于相位过渡的复杂性和空气稳定性差,它们的实际使用受到限制.
研究的目的:
- 为O3型高层氧化物开发一种新的合成方法,以提高空气稳定性和电化学性能.
- 调查高设计对循环过程中的相位过渡和结构完整性的影响.
主要方法:
- 采用酸盐sol-gel方法,使用酸盐作为源和化剂来创建3D网状结构.
- 高层氧化物 (Na0.9Ca0.05Fe0.2Mn0.2Ni0.2Ti0.2LixCo0.2-xO2) 的合成和特征.
- 进行了密度功能理论 (DFT) 计算,以了解结构稳定性和兴奋剂效应.
主要成果:
- 高设计有效地稳定了O3-P3相位过渡的可逆性,并减少了Na+/H+交换,提高了空气稳定性.
- 优化的阴极材料在10C的200个循环后保持了71%的容量,在1C的100个循环后保持了115mAh的g-1,保持了85.2%.
- 该材料在40-50%的相对湿度下暴露在空气中10天后显示出出色的稳定性.
结论:
- 甲基酸盐sol-gel方法成功合成了稳定的空气,高的O3型层状氧化物.
- 高工程是开发用于离子电池的高性能,耐用阴极材料的可行策略.
- 这项工作为创建具有增强电化学特性和环境稳定性的先进离子电池阴极提供了途径.
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