构建一个尺寸可控制的球形P2型分层氧化物阴极,实现可行的离子电池
Shuo Yin1, Zongzhi Tao2, Yuying Zhang1
1CNGR Advanced Materials Company, Ltd., Changsha 410600, P. R. China.
ACS applied materials & interfaces
|May 10, 2024
概括
离子电池的二次球形阴极材料显示出增强的循环稳定性和容量保留. 这项研究为下一代储能解决方案提供了有前途的进展.
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:
- P2型层状金属氧化物是离子电池的关键阴极材料,提供高电压和快速离子扩散.
- 挑战包括有限的容量和由于相位转换和结构退化而导致的循环稳定性差.
研究的目的:
- 为了合成二次球形阴极材料,提高离子电池的性能.
- 为了研究形态学和电化学性质之间的关系.
主要方法:
- 共同沉方法用于制备二次球形阴极的前体.
- 合成P2型Na0.67Ni0.18Mn0.67Cu0.1Zn0.05O2与受控制的半径.
- 半电池和圆柱状电池的电化学测试.
- 在现场X射线衍射用于相位过渡分析.
主要成果:
- 合成的球形阴极具有高点密度 (1.52 g cm−3) 和紧密度 (3.2 g cm−3).
- 半电池显示在0.1°C下111.8mAhg-1和在5°C下1000个循环后82.64%的容量保留.
- 在现场XRD证实了可逆的P2-OP4阶段过渡,体积变化最小 (6.96%).
- 圆柱形电池达到4.7Ah容量,在2C时1000个周期内稳定循环.
结论:
- 二次球形形态增强了P2型阴极的循环稳定性和电化学性能.
- 通过共同降水进行可控合成,可用于工业生产.
- 这些材料显示出实用离子电池应用的巨大潜力.
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