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通过动态硬域设计为稳定的金属阳极构建离子导电超分子弹性体保护层
Chenbei Zhang1, Xiaohu Qian1, Dong Wang2
1School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
ACS applied materials & interfaces
|October 4, 2023
概括
研究人员开发了一种新型的超分子弹性体,用于稳定可充电水性离子电池 (RAZB) 中的阳极. 这种材料通过防止树的生长和腐蚀来提高电池寿命和性能.
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
- 聚合物化学 聚合物化学
背景情况:
- 可充电的水性离子电池 (RAZBs) 面临着由于树突生长和阳极上的寄生反应的挑战.
- 这些不稳定性限制了RAZB的实际应用和循环稳定性.
研究的目的:
- 开发一种新的离子导电超分子弹性体,用于RAZB中稳定金属阳极.
- 增强电极-电解质接口,提高RAZBs的整体电化学性能.
主要方法:
- 使用 Zn 盐和聚氨-尿素-聚烯糖醇聚合物骨架合成了一种离子导电的超分子弹性体.
- 研究了弹性体的机械强度,离子导电性,疏水性和粘附性质.
- 通过电化学循环和使用MnO2的全细胞组装评估了修改后的阳极的性能.
主要成果:
- 弹性体有效地稳定了阳极,通过可逆键解离/再结合,对体积变化表现出动态适应.
- 与聚烯糖醇段的协调促进了快速的离子运输,而疏水性抑制了水引起的腐蚀.
- 修改后的阳极表现出极好的循环稳定性 (>550小时在5 mA cm-2下) 并改善了全细胞性能.
结论:
- 开发的高分子弹性体成功地解决了RAZBs中的阳极不稳定性.
- 这种材料为设计水性电池系统中稳定的固体电解质相间层 (SEI) 提供了一个有前途的策略.
- 这些发现为加速RAZBs商业化提供了宝贵的见解.
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