石榴石型Ga-LLZO固体电解质和全固态电池的高能丰富层状氧化物阴极的界面上的化学兼容性
Natalia B Timusheva1, Alexander A Golubnichiy1, Anatolii V Morozov2
1Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow, 121205, Russia.
Scientific reports
|January 2, 2025
概括
石榴石固体电解质和丰富的阴极之间的高温反应形成了新的产品,如Li2ZrO3. 这项研究对于开发更安全,更高能量的全固态电池至关重要.
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
- 固态化学 固态化学
背景情况:
- 与液体电解质电池相比,全固态电池 (ASSB) 提供了更高的安全性和高能量密度.
- 石榴石类型的固体电解质,如Li6.4Ga0.2La3Zr2O12 (Ga-LLZO),对ASSB来说是有前途的.
- 高能量密度阴极对于推进电池技术至关重要.
研究的目的:
- 为了研究Ga-LLZO固体电解质和丰富层次Li1.2Ni0.2Mn0.6O2 (LNM) 阴极之间的高温化学兼容性.
- 识别反应产物并了解反应机制.
- 为了比较与其他高能阴极材料的兼容性.
主要方法:
- 高温反应研究. 高温反应研究.
- 粉末X射线衍射 (PXRD) 用于相位识别.
- 传输电子显微镜 (TEM) 用于微观结构分析.
- 密度函数理论 (DFT) +U计算用于理论验证.
主要成果:
- 在Ga-LLZO和LNM之间发生在700-900°C的高温反应.
- 主要的反应产物是,,和Li2ZrO3.
- 2ZrO3被确定为这个系统的新反应产物.
- DFT+U的计算支持了Li2ZrO3.3的形成.
结论:
- 由于有害反应,Ga-LLZO和LNM之间的化学兼容性在高温下是有限的.
- 了解这些反应对于设计ASSB中稳定的接口至关重要.
- 需要进一步的研究,以减轻这些反应的实际ASSB应用.
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