用于长周期固态硫电池的接口自愈合聚合物电解质
1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Nature communications
|January 8, 2024
概括
一种新型的自我修复聚合物电解质通过改善接口接触和稳定性来提高固态金属电池的性能. 这一突破解决了对更安全,高能耗可充电电池的关键挑战.
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
- 聚合物科学 聚合物科学
背景情况:
- 固态金属电池提供更高的能量密度和安全性.
- 挑战包括有限的离子导电性,高的界面电阻和树的生长.
研究的目的:
- 为改进的固态金属电池设计一种自我修复的聚合物电解质.
- 为了减少界面阻力和增强界面接触.
主要方法:
- 开发一种以聚乙为基础的固态聚合物电解质,具有动态共价二硫化物和键.
- 组装完整的电池与集成的电极/电解质.
- 使用超声波成像来评估接口接触.
主要成果:
- 聚合物电解质表现出良好的界面自我愈合,并保持良好的界面接触.
- 在6000个小时的时间里,Li2和Li2对称的细胞实现了稳定的循环运行.
- 固态Li-S电池的使用寿命在0.3°C下为700个周期.
- 超声波成像证实了集成结构与层结构相比,在集成结构中具有优越的界面接触.
结论:
- 自愈的聚合物电解质有效地降低了接口电阻,并改善了固态金属电池的接口接触.
- 这种接口双一体化战略为开发高性能和安全的固态电池提供了一个有前途的途径.
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