水化物和化物双替代 argyrodites 的替代
Ji-Hoon Han1,2, Do Kyung Kim3, Young Joo Lee3,4
1Energy Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea. oze@kist.re.kr.
Materials horizons
|November 6, 2023
概括
新的化/化物双替代化固体电解质为全固态电池提供高离子导电性. 这些材料显示出稳定的循环和商业化潜力.
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:
- 硫化物固体电解质,特别是 argyrodites,是所有固态电池的领先候选人,因为它们的高离子导电性和可加工性.
- 开发具有增强性能的新型固体电解质对于推进超越当前离子限制的电池技术至关重要.
研究的目的:
- 为了合成和表征新的化/化物双替代化类固体电解质.
- 研究所有固态电池中这些电解质的离子导电性,电化学稳定性和性能.
主要方法:
- 合成Li7-PS6-(BH4) X电解质 (X = Cl, Br, I) 使用两步球磨方法,没有后.
- 使用电化学阻抗光谱测量离子导电性.
- 在Li对称电池和全固态电池配置中的电化学性能评估.
主要成果:
- 组成Li5.35PS4.35(BH4)1.15Cl0.5在低温烧结后达到26.1mS cm-1的最高离子导电性.
- 在Li对称细胞中观察到稳定的涂/剥离循环 (>2,000小时) 和高临界电流密度 (2.1 mA cm-2).
- 在使用这种电解质和纯阳极的全固态电池中,获得了86.4%的初始库伦比效率.
结论:
- 在 argyrodite 电解质中化/化双替代显著提高离子导电性,通过增加 Li 空位和位点障碍.
- 开发的电解质对金属阳极显示出有希望的稳定性,这对于高能量密度固态电池至关重要.
- 尽管热稳定性有限,但其广泛的组成范围和高离子导电性突出显示了它们在实用的全固态电池应用中的潜力.
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