金属兴奋剂促进了用于离子电池的阴极材料的高稳定性和离子动力学
Weiping Shu1, Lili Wang1, Siqiang Zhang1
1School of Mathematics, Physics and Statistics, Shanghai University of Engineering Science Shanghai 201620 China swpingyes@gmail.com llwang@sues.edu.cn.
RSC advances
|February 21, 2025
概括
在多层过渡金属氧化物中的兴奋剂通过稳定结构和改善离子扩散来提高离子电池阴极性能. 这项研究提供了一个有前途的阴极材料,具有更好的循环稳定性和速率能力.
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:
- 层层的过渡金属氧化物是对离子电池的有希望的阴极材料,因为它们的容量大,成本低.
- 挑战包括不利的相位过渡,Na+/空位障碍和缓慢的离子动态,阻碍实际应用.
研究的目的:
- 为了提高离子电池的P2-Na0.67Ni0.1Co0.1Mn0.8O2阴极的性能.
- 通过 heteroatom 替换来抑制不利的相位过渡,并优化 Na+/空位排序.
主要方法:
- 在金属部位准备一个P2-Na0.67Ni0.1Co0.1Mn0.8O2阴极,用 (Li) 异原子替代.
- 电化学测试包括初始放电特定容量,循环性能,速率能力和动力分析.
主要成果:
- 化阴极 ([Na0.57Li0.1]Ni0.1Co0.1Mn0.8O2) 的初始排放特异容量为151.3 mAh g-1在0.1C时.
- 在100个循环后,容量保留达到了87.9%,这表明循环稳定性有所改善.
- 在10°C时实现了88.2mAhg-1的优异速率容量,这归因于增强的Na+扩散.
结论:
- 兴奋剂有效地抑制相位转换,并优化Na+/空位顺序在层层的过渡金属氧化物阴极中.
- 增强的结构稳定性和改进的Na+扩散动力学导致离子电池的卓越循环性能和速率能力.
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