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在高能阳极上的稳定介面的设计阴极添加剂
Mengyu Tian1,2,3, Liubin Ben1,2,3, Hailong Yu1,2,3
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|August 12, 2022
概括
使用元素硫的新型设计阴极添加剂 (DCA) 创建了一个强大的固体电解质介面层 (SEI). 这提高了电动汽车和电网存储的高能电池的稳定性和性能.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 高能阳极材料 (基于) 对于下一代电池至关重要,其能量密度高于当前的离子技术.
- 这些阳极上的固体电解质相间层 (SEI) 的稳定性对长期电池性能至关重要.
- 电动汽车和电网存储等新兴市场需要更高能量密度和更长寿命的电池.
研究的目的:
- 在高能阳极上形成薄而坚固的SEI层的新方法.
- 提高可充电电池的循环稳定性和容量保留.
- 使先进的阳极材料在储能解决方案中的实际应用成为可能.
主要方法:
- 引入元素硫的超薄涂层作为设计阴极添加剂 (DCA).
- 在高能阳极 (例如,-碳复合物,-锡合金) 上形成修改后的SEI层.
- 电化学表征以评估电池性能,包括容量保留和循环稳定性.
主要成果:
- DCA元素硫促进硫酸 (R-OSO2OLi) 和类似于聚乙烯氧化物 (PEO) 的聚合物SEI层的形成.
- 修改后的SEI层具有出色的酸 (Li+) 透性和弹性,能够适应阳极体积的变化.
- 观察到循环效率的显著改善,测试的高能阳极电池容量保持率提高了14- 35%.
结论:
- 拟议的DCA元素硫层通过形成上层SEI层有效地稳定了高能阳极.
- 这种方法显著提高了可充电电池的循环性能和寿命.
- 这一发现为先进的电池技术的商业部署铺平了道路.
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