稀土离子调节格子软化化物固体电解质,用于高稳定性快速充电固态电池
Xiaomeng Shi1, Zhichao Zeng1, Qian Zhang2
1Tianjin Key Laboratory for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, P. R. China.
Nano letters
|May 3, 2025
概括
研究人员开发了一种新的固态电解质,用于更安全,更高能量的电池. 基于加多的化电解质表现出极好的可变性和稳定性,使全固态电池能够快速充电和长周期使用寿命.
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
- 固态电池 固态电池是什么
背景情况:
- 全固态电池 (ASSLB) 提供了更高的安全性和能量密度.
- 具有良好的加工能力的高性能固态电解质 (SE) 对稳定和高效的ASSLB至关重要.
- 基于化物 (Br) 的稀土化物SE (RE-HSEs) 由于离子变形性而具有前景.
研究的目的:
- 研究稀土 (RE) 离子对基于Br的RE-HSEs的晶体结构和机械性能的影响.
- 为了确定最佳的RE-HSEs以提高ASSLB的性能.
- 建立用于设计先进固态电解质的结构-属性关系.
主要方法:
- 对基于Br的RE-HSEs (RE=Y,Gd,Tb,Ho,Er) 的晶体结构和机械性能进行系统分析.
- 评价选定的电解质的离子导电性.
- 使用Li3GdBr6 (LGdB) 电解质的ASSLB的制造和电化学测试.
主要成果:
- Li3GdBr6 (LGdB) 呈现出最软的晶格和最好的可变形性,这是由于最长的RE-Br键长度.
- LGdB 显示出令人满意的离子导电性 (1.4 mS cm−1).
- 组装的ASSLB显示可逆氧化还原,优异的快充能力,以及在10°C的6000个周期中卓越的循环稳定性.
结论:
- RE 离子对基于 Br 的 RE-HSE 的可变性产生重大影响.
- 对于高性能ASSLB来说,LGdB是一种有前途的固态电解质.
- 了解RE-变形性关系是合理设计和改善化物固体电解质的关键.
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