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基于PAN-硫复合材料的金属硫电池阴极

Shuya Wei¹, Lin Ma¹, Kenville E Hendrickson¹

¹School of Chemical and Biomolecular Engineering, ‡Department of Materials Science and Engineering, Cornell University , Ithaca, New York 14853, United States.

Journal of the American Chemical Society

|September 2, 2015

概括

新的硫/聚烯 (SPAN) 纳米复合材料消除了可充电-硫 (Li-S) 电池中的聚硫化物. 这些稳定的SPAN阴极可以在没有传统阳极稳定器的情况下实现高能Li-S电池.

科学领域:

材料科学
电化学
能量储存

背景情况:

可充电-硫 (Li-S) 电池具有高的理论能量密度,但面临着多硫化物运输等挑战.
多硫化物溶解和迁移阻碍了Li-S细胞的性能和循环寿命.

研究的目的:

开发高能Li-S电池的新型阴极材料, 克服多硫化物问题.
研究硫/多烯 (SPAN) 纳米复合物的电化学行为和稳定性.

主要方法:

使用硫和聚烯 (PAN) 作为反应剂的硫/聚烯 (SPAN) 纳米复合物的简单热合成.
电化学分析 (循环,库伦比效率) 和SPAN阴极的光谱表征.
在没有传统阳极稳定剂的简单碳酸盐电解质中使用SPAN阴极测试Li-S电池.

主要成果:

在整个氧化还原过程中,SPAN纳米复合材料以小分子形式 (S3/S2) 保持硫.
在 PAN 主体内对硫的共价结合和物理限制有效地消除了聚硫化物溶解和穿.
在简单的电解质中,即使没有阳极稳定剂,Li-SPAN电池也表现出稳定的循环,高库伦比效率.
在数百个循环中观察到元素硫和离子之间的完全和可逆的氧化还原转换,产生Li2S.

结论:

SPAN纳米复合材料代表了Li-S电池阴极材料的重大进步.
开发的材料有效地解决了Li-S电池的关键局限性,为实际的高能耗应用铺平了道路.
这种方法为先进的Li-S电池提供了简化和稳定的电解质系统.

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