使用酸盐和酸盐混合材料为硫化物基固态电池的阴极涂层的设计
Yusuke Morino1, Akihiro Shiota1, Satoshi Kanada1
1Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC) 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.
ACS applied materials & interfaces
|July 18, 2023
概括
开发新的混合酸和酸涂层显著提高了所有固态电池阴极的耐用性. 这些先进的涂层通过抑制分解反应来提高在恶劣条件下的性能.
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:
- 用硫化物固体电解质涂覆全固态电池 (ASSB) 中的正极活性材料对于性能提升至关重要.
- 酸 (LiNbO3) 是一种常见的涂料材料,但在高电位和高温下耐用性较差.
- 这种限制阻碍了高性能ASSB的开发.
研究的目的:
- 开发新的混合涂料材料,将酸 (Li-Nb-O) 和酸 (Li-P-O) 结合起来.
- 调查P/(Nb + P) 比对这些混合涂料的耐用性的影响.
- 了解混合涂料耐久性提高背后的机制.
主要方法:
- 用LiPxNb1-xO3混合材料 (x = 0-1) 涂覆的正极材料的制造.
- 在恶劣条件下对阴极半电池进行120小时的降解测试 (60°C,4.55V与Li/Li+相比).
- 使用先进技术进行分析:SEM/EDS,TEM,XPS,XAS,ToF-SIMS,TEM/电子衍射.
主要成果:
- 在LiNbO3涂层中使用P替代物显著提高了耐用性和降低了界面电阻.
- 混合涂层的P/(Nb + P) 比率为0.5 (x=0.5),表现出优越的容量保留和较低的界面电阻.
- 分析显示,Nb-O-P协调中的P捕获了氧气,抑制了分解的副作用.
结论:
- 混合Li-Nb-O/Li-P-O涂层为ASSB阴极提供了与纯LiNbO3.3相比更好的耐用性.
- 替代机制有效地稳定了对氧化分解的涂层层.
- 优化的混合涂层有望实现高性能和持久的全固态电池.
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