高性能硫电池的三元混合材料
Qi Fan1,2, Wen Liu1, Zhe Weng1
1Department of Chemistry and Energy Sciences Institute, Yale University , New Haven, Connecticut 06511, United States.
Journal of the American Chemical Society
|September 18, 2015
概括
研究人员开发了一种新的碳纳米管/NiFe2O4-硫混合材料,以提高可充电-硫电池的性能. 这种先进的材料显著提高了容量,速率能力和循环稳定性,从而有效地储存能量.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 可充电硫电池具有高能量密度和低成本,但由于聚硫化物穿和导电性差,其容量下降.
- 硫阴极因多硫化物溶解和活性材料的低电导率而受到限制,这阻碍了实际应用.
研究的目的:
- 通过设计一种新的三元混合材料来解决硫电池的局限性.
- 提高硫阴极的电化学性能,特别是容量衰变和特异性容量.
主要方法:
- 一种碳纳米管 (CNT) /NiFe2O4-S三元混合材料的合成.
- 用于硫电池应用的材料结构和电化学特性.
主要成果:
- 通过CNT网络,可以确保高效的电子传输和结构完整性.
- NiFe2O4纳米板有效地捕获聚硫化物中间体,减轻穿.
- 在CNT/NiFe2O4支架上分布良好的硫纳米粒子可以快速储存和释放Li+.
- 在0.1°C时达到1350 mAh g−1和1°C时达到900 mAh g−1的可逆特异性.
- 经过500个循环,每个循环的容量衰减约为0.009%,证明了极好的循环稳定性.
结论:
- 开发的CNT/NiFe2O4-S混合材料为高性能硫电池提供了有前途的解决方案.
- 三元组件的协同效应导致增强的特定容量,速率能力和长期循环稳定性.
- 该材料具有高库伦比效率,表明有效的电荷转移和最小的侧面反应.
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