提高硫电池的循环性能,将分离器涂上阴离子选择性聚合物层
Zhong Li1, Qiyun Pan1, Peiyue Yang1
1Institute for Advanced Materials, Hubei Normal University, 435002, Huangshi, China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|August 31, 2023
概括
研究人员为聚烯分离器开发了一种阴离子选择性聚合物层,以防止硫电池中的聚硫化物穿. 这项创新显著提高了电池容量和电动汽车潜在应用的周期寿命.
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:
- 硫 (Li-S) 电池为电动汽车提供高能量密度.
- 在Li-S电池中的聚硫化物穿会导致容量降低.
- 目前的分离器正在努力缓解聚硫化物迁移.
研究的目的:
- 开发一种修改后的分离器,可以抑制聚硫化物穿.
- 为了提高Li-S电池的循环性能和稳定性.
主要方法:
- 用阴离子选择性聚合物对聚烯 (PP) 分离器的表面修改.
- 加入二硫胺离子用于聚硫化物排斥.
- 整合乙氧链以促进离子导电性.
主要成果:
- 修改后的PP分离器有效地阻断了聚硫化物运输.
- 带有涂层分离器的Li-S电池显示出更好的容量保留 (409.4 mAh g−1比228.5 mAh g−1在300个循环后).
- 产能色率显著下降,从60.9%降至43.2%.
结论:
- 阴离子选择性聚合物涂层是一种可行的策略,可以抑制聚硫化物穿.
- 这种修改提高了Li-S电池的长期稳定性和性能.
- 开发的分离器对未来的电动汽车应用非常有希望.
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