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具有超高面积容量的全固态硫电池的特定能量接近500WhKg-1
Yi Lin1, Lucy G Somervill2, Rehan Rashid2
1Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton, VA, 23681, USA.
Small (Weinheim an der Bergstrasse, Germany)
|March 4, 2025
概括
全固态硫电池通过使用新型复合阴极与空洞石墨烯和薄型固态电解质实现505Wh kg-1的特定能量. 这一突破推动了电动航空的安全,高能储能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 全固态-硫 (Li-S) 电池为电动航空提供高特异能 (500Wh-1kg),但由于硫的低导电性和固态电解质 (SSE) 的重量而面临挑战.
- 在固态系统中有效利用硫阴极需要克服导电性限制,并尽量减少SSE分离器和金属阳极的不活性材料重量.
研究的目的:
- 设计和演示一个高特异能全固态Li-S电池系统.
- 为了解决硫阴极的低导电性,并减少实际应用的总体电池重量.
主要方法:
- 开发固态硫复合电极,采用硫化 (SSE) 和孔状石墨烯作为导电支架.
- 优化SSE分离器厚度和减少多余的金属阳极,以最大限度地降低电池重量.
- 在超高质量负载 (高达15毫克厘米-2) 时测试阴极性能.
主要成果:
- 实现了高硫利用率和前所未有的面积容量超过20 mAh cm-2.
- 通过优化的阴极,薄的SSE和减少的Li金属阳极,证明了单位电池特异能为505Wh kg-1 .
- 证实了在固态Li-S电池中实现高特异能的可行性.
结论:
- 开发的固态复合体阴极与孔状石墨烯和阿尔吉罗迪特SSE使得高硫利用率和面积容量.
- 尽量减少SSE厚度和Li金属阳极过剩对于实现Li-S电池的超高特异能至关重要.
- 进一步优化为电动航空等苛刻的应用提供了通往实用,高性能固态Li-S电池的可行途径.
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