[Ni0.84Co0.10Mn0.06]O2阴极的接口工程,用于更安全的离子电池
Zhanning He1, Yu Su1, Mingzeng Luo1
1State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
ACS applied materials & interfaces
|May 21, 2025
概括
研究人员开发了一种纳米尺寸的Li-Al-P-O涂层,用于富含Ni的正极材料. 这种涂层通过防止危险的原子氧释放和电解质分解来增强离子电池的热稳定性.
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:
- 富含的三元阴极材料 (xNi>>0.80) 在高电荷状态下表现出结构和热不稳定性.
- 这种不稳定性与氧化的原子氧释放和随后的电解质分解有关,这在离子电池中构成安全风险.
研究的目的:
- 开发一种保护性涂层用于富含Ni的正极材料,以提高热稳定性.
- 为了抑制由原子氧和电解质氧化引起的有害"触发"效应.
主要方法:
- 在Li[Ni0.84Co0.10Mn0.06]O2 (NCM84) 粒子上制造一个渐变Al3+内层和一个纳米尺寸Li-Al-P-O (LAPO) 外层 (<10 nm).
- 热稳定性评估使用NCM/石墨全细胞的加速率热量计.
主要成果:
- 在LAPO涂层显著抑制了大约50%的delithiated阴极的热功率.
- 加速速率热量计证实了热量生成的显著减少,防止了全细胞的热失控.
- 纳米 LAPO 层有效抑制了原子氧的释放,促进其转化为稳定的氧分子.
结论:
- 开发的纳米 LAPO 涂层提供了一个有前途的策略,以提高富含 Ni 的正极材料的热稳定性.
- 这种方法为原子层沉积修改的阴极提供了指导方针,使得更安全的高能量密度离子电池成为可能.
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