在高性能准固态电池的zwitterionic凝聚合物电解质中调节离子运输和溶解化学
Lu Nie1, Xinru Wu1, Haotian Qu1
1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People's Republic of China.
概括
这项研究介绍了用于金属电池 (LMB) 的zwitterionic凝聚合物电解质 (GPE). 新型GPE抑制了树突的生长,增强了离子转移,提高了电池的性能和稳定性.
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:
- 凝聚合物电解质 (GPEs) 是下一代金属电池 (LMB) 的关键.
- 在GPEs中的阳离子迁移导致电荷分布不均和树生长.
- 强烈的离子溶剂相互作用阻碍了Li+的转移,并增加了溶解障碍.
研究的目的:
- 开发一种zwitterionic GPE,以解决LMBs中的离子迁移和Li+溶解问题.
- 为了增强金属电池的接口特性和循环稳定性.
主要方法:
- 一个zwitterionic GPE的设计和合成.
- 对盐分离和离子限制的离子双极相互作用的研究.
- 对+解溶的竞争协调效应的分析.
- 在循环过程中形成的保护性无机介相的表征.
主要成果:
- 兹维特里昂式GPE有效地抑制了空间电荷诱导的树生长.
- 削弱的Li + - 溶剂相互作用加速了Li + 界面溶解.
- 导电性N和S丰富的无机介相增强了循环稳定性.
- 在1000个循环后,LICIDASpAN电池表现出高放电能力 (528.3mAhg-1在-20°C) 和79.6%的保留率.
- 立即下载的SPAN袋式电池实现了高放电 (1.63 Ah) 和面积容量 (16.3 mAh cm-2).
结论:
- 兹维特里昂式GPE为先进的准固态LMB提供了一个有前途的策略.
- 调节离子运输和离子溶剂化学对于提高电池性能至关重要.
- 开发的GPE显著提高了金属电池的安全性和效率.
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