在硫化物全固态电池中的高NMC阴极上,阴解质老化的影响
Yuanshun Li1,2, Yukio Cho3, Jiyu Cai4
1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. yangg@ornl.gov.
Materials horizons
|November 7, 2024
概括
这项研究研究了使用NMC811阴极在硫化物固态电池 (SSB) 中的日历衰老. 6PS5Cl (LPSCl) 显示出最好的容量保留,而新的老化协议有助于为更安全,更持久的电池选择材料.
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
- 电池技术 电池技术
背景情况:
- 硫化物固态电解质 (SSEs) 为所有固态电池 (SSB) 提供高离子导电性和安全性.
- 高能LiNi0.8Mn0.1Co0.1O2 (NMC811) 阴极在硫化物SSB中提出了界面挑战,包括氧化不稳定性和阴极电解质间相 (CEI) 形成.
- 对实践SSB应用至关重要的日历寿命,尽管进行了广泛的循环研究,但仍然不太了解.
研究的目的:
- 系统地研究LiNbO3 (LNO) 涂层的NMC811阴极在硫化物SSB中的不同阴极体的日历衰老行为.
- 评估各种阴极体 (LPSCl,LIC-LPSCl,LYC-LPSCl,LGPS) 在储存期间对NMC811阴极体的稳定性和性能的影响.
- 建立一个有效的电化学日历衰老测试协议,以快速评估SSB日历寿命.
主要方法:
- 系统的日历衰老测试是在使用 LiNbO3 (LNO) 涂层的 NMC811 阴极与四种不同的阴极酸结合进行的:Li6PS5Cl (LPSCl),Li3InCl6-Li6PS5Cl (LIC-LPSCl),Li3YCl6-Li6PS5Cl (LYC-LPSCl) 和Li10GeP2S12 (LGPS).
- 细胞在室温的高电荷状态 (SOC) 中存储,以加速衰老.
- 开发了一种电化学日历衰老协议,以模拟日常使用并预测长期性能.
主要成果:
- 在高SOC和室温下储存期间,Li6PS5Cl (LPSCl) 证明了NMC811阴极的最佳容量保留.
- Li3InCl6-Li6PS5Cl (LIC-LPSCl) 阴极表现出显著的容量降解和化学不兼容性问题.
- 开发的电化学日历老化协议有效模拟日常使用,并允许快速推断SSB日历寿命.
结论:
- 在硫化物SSB中的NMC811阴极的日历衰老性能上,选择的阴解质有很大的影响.
- 在硫化物SSB的高NMC复合材料阴极中,LPSCl是实现更好的容量保留的有希望的阴解质.
- 新的日历衰老测试协议加速了长期使用硫化物SSB的材料发现和开发.
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