一个氧化无形固体电解质家族,用于长周期全固态电池
Shumin Zhang1,2, Feipeng Zhao1, Jiatang Chen2
1Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON, N6A 5B9, Canada.
Nature communications
|June 24, 2023
概括
基于氧化的新型无形固体电解质显示出高离子导电性,可用于更安全,更持久的全固态电池,即使在低温下也表现良好.
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:
- 固体电解质对于开发更安全,更耐用的全固态电池 (ASSB) 至关重要.
- 现有的固体电解质在实现高离子导电性和在各种温度范围内性能方面面临挑战.
- 无形固体电解质在离子传输方面比晶体对应物具有潜在的优势.
研究的目的:
- 介绍一种新的无形固体电解质家族,表示为xLi2O-MCl (M = Ta或Hf).
- 研究这些新材料的离子导电性和结构性质.
- 为了评估使用这些无形固体电解质的ASSB的电化学性能.
主要方法:
- 不同组成的无形固体电解质的合成和表征 (xLi2O-MCly).
- 在不同温度下测量离子导电性.
- 使用开发的电解质制造和测试全固态电池.
主要成果:
- 在25°C下达到高离子导电率,高达6.6 × 10−3 S cm−1,与晶体电解质相当.
- 已建立的混合离子结构模型将结构与快速的离子导电相关联,突出了与氧结合的网络和终端.
- 在25°C和-10°C的ASSB中表现出极好的电化学性能,xLi2O-TaCl5在400 mA g−1.1.时有超过2400个周期.
结论:
- 新的xLi2O-MCly无形固体电解质表现出优越的离子导电性和电化学性能.
- 独特的混合离子结构促进了快速的离子运输,使电池能够高效地运行.
- 这些氧化无形固体电解质在先进的全固态电池中显示出实际应用的重大前景.
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