高能量密度硫电池的电子和离子导电框架
Xueting Feng1,2, Xuanguang Ren1,2,3, Huahui Tian3,4
1School of Materials Science and Engineering, Peking University, Beijing 100871, P. R. China.
Journal of the American Chemical Society
|August 11, 2025
概括
研究人员开发了一种使用碳纳米管 (CNT) 和硫纤维的新型导电框架,用于高能量密度的-硫 (Li-S) 电池. 这种先进的阴极设计克服了Li-S电池技术的关键性能限制.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- -硫 (Li-S) 电池的高能量密度受到低导电性和多硫化物在薄电解质的厚阴极中移动等挑战的限制.
- 这些问题阻碍了电池的性能,需要为实际应用提供创新的解决方案.
研究的目的:
- 设计和制造高性能Li-S电池的电子和离子导电框架.
- 解决电导率,聚硫化物穿和Li-S电池阴极的机械不稳定性等关键问题.
主要方法:
- 采用层次方法将碳纳米管 (CNT) 和硫集成到空气等离子处理的阿拉米德纤维 (APAF) 上,形成CNT/S/APAF复合物.
- 这种复合材料被纳入CNT网络,用于为Li-S电池制造独立的硫阴极.
主要成果:
- CNT/S/APAF阴极显示了增强的电子传输,电解质可湿性和抑制的多硫化物扩散.
- 在高硫负载 (7.83毫克/厘米/厘米) 和低E/S比率 (5微升/毫克/厘米) 的情况下,初始的特定容量为1437.6毫克/厘米/厘米和面积容量为11.3毫克/厘米/厘米/厘米/厘米/厘米.
- 在100个循环后,Li-S电池的能量密度达到468.6 Wh kg-1并保持6.5 mAh cm-2.
结论:
- 开发的导电框架有效地减轻了Li-S电池的性能限制.
- 这种可扩展的方法为下一代储能设备提供了实用且高性能的解决方案.
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