实施不同的转换/合金活性材料作为基固态电池的阳极
Julian J A Kreissl1,2, Hoang Anh Dang1,2, Boris Mogwitz1,2
1Institute of Physical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany.
ACS applied materials & interfaces
|May 9, 2024
概括
研究人员探索了像SnO2这样的转换/合金材料,用于固态电池 (SSB). 一个新的2D板电极设计提高了性能和周期寿命,解决了这些高能储能设备的界面退化问题.
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:
- 固态电池 (SSB) 需要高能,高功率的阳极材料来与离子电池竞争.
- 转化/合金活性材料,如SnO2,具有高容量和快速动力学,但在硫化物SSB中尚未得到充分探索.
- 现有的研究经常使用这些材料作为介层,而不是作为主要阳极,在电极设计和界面稳定性方面面临挑战.
研究的目的:
- 合成和评估新的转换/合金阳极材料 (SnO2,Sn0.9Fe0.1O2,ZnO,Zn0.9Fe0.1O) 用于硫化物基础的SSB.
- 研究这些阳极材料的电化学性能,包括C率能力和长期循环能力.
- 了解和减轻阳极和Li6PS5Cl固体电解质之间的界面降解过程.
主要方法:
- 四种转化/合金活性材料的合成.
- 使用Li6PS5Cl固体电解质制造这些材料的复合电极.
- 使用XRD,SEM和FIB-SEM进行结构和微结构的表征.
- 通过40MPa以下的静电循环进行电化学测试,包括C-rate性能和长期可循环性评估.
- 设计和测试2D板电极以解决接口问题.
主要成果:
- 所有合成的材料都被纳入SSB的复合电极中.
- 发现Fe的替代增强了Li6PS5Cl在阳极接口上的分解.
- 一个2D板电极设计通过解决接口退化,显著提高了C-rate性能 (3倍) 和长期循环能力 (2.3倍).
结论:
- 转换/合金材料在硫化物SSB中的阳极方面表现有前途,但界面稳定性至关重要.
- 铁的替代可以加剧电解质分解,强调需要仔细选择材料.
- 开发的2D板电极架构有效地减轻了接口降解,提高了SSB的性能和耐用性.
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