完全固态的硫电池增强了氧化介质
Xin Gao1, Xueli Zheng1, Yuchi Tsao2
1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|October 22, 2021
概括
这项研究为全固态硫电池 (ASSLSB) 引入了氧化还原介质 (RMs),显著降低了硫化氧化的能量屏障,并提高了电池的性能和稳定性.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 氧化还原介质 (RMs) 在液体电解质电池中至关重要,但在固态系统中尚未探索.
- 全固态硫电池 (ASSLSB) 面临硫化物 (Li2S) 氧化能障碍的挑战.
- 开发高效的RM是释放ASSLSB潜力的关键.
研究的目的:
- 研究完全固态硫电池的氧化还原介质候选物.
- 探索氧化还原媒介在增强Li2S氧化中的作用和行为.
- 提高ASSLSB的电化学性能和稳定性.
主要方法:
- 对氧化还原媒介候选物的选,专注于基化合物.
- 具有和没有氧化还原介质的Li2S阴极的电化学特征.
- 运行硫K边缘X射线吸收光谱来追踪硫的物种化.
- 性能评估包括循环稳定性和速度能力.
主要成果:
- 基于子的氧化还原介质 (AQT) 显示出有利的氧化还原潜力和Li2S氧化可逆性.
- 带有AQT的ASSLSB表现出较低的充电能障碍 (2.4V) 和高放电能力 (1133 mAh gs-1).
- 操作光谱学证实,AQT促进了固体-多硫化物-固体反应,增强了Li2S氧化动力学.
结论:
- 反氧介质,特别是AQT,可以有效降低ASSLSB中的Li2S氧化激活能量.
- 通过AQT增强的路径显著提高了硫的利用率,循环稳定性 (150个循环的CE为98.9%) 和速度能力.
- 这项工作为设计有效的氧化还原介质以加速固态电池中的Li-S反应建立了途径.
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