在先进的离子电池的高二相阴极中局部化学和电离子潜力的协同调节
Zixuan Jiang1, Shao Wang1, Lai Yu1
1Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of chemistry, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
一种新的双相高阴极材料通过提高结构稳定性和离子扩散来提高离子电池的性能. 这种双重修改策略克服了实际应用的容量退化挑战.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- O3-NaNi0.5Mn0.5O2是离子电池的一个有前途的阴极材料.
- 容量降低和较差的+扩散限制了其实际应用.
- 结构损坏和固有的扩散障碍是主要的挑战.
研究的目的:
- 开发一个双修改策略来提高阴极性能.
- 构建一个双相高性阴极材料.
- 解决容量降低和改善+扩散动力学.
主要方法:
- 合成了一种双相高阴极材料:Na0.796Ni0.3Mn0.47Al0.03Zn0.03Fe0.1Ti0.07O2.
- 研究局部化学和离子电位调整的影响.
- 评估的电化学性能,包括容量,循环稳定性和能量密度.
主要成果:
- 在0.1°C的温度下达到148.9mAh的显著容量.
- 在5°C下1000次循环后,表现出卓越的循环稳定性,容量保持率为87.2%.
- 报告了令人印象深刻的能量密度为282.8Wh kg-1在34.9W kg-1.
结论:
- 双重修改策略有效地提高了结构稳定性和Na+扩散.
- 添加硬酸金属离子调节氧气分布以提高稳定性.
- 双相高结构减轻了应变并提高了动力学, 显示了实际可行性.
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