PVDF-HFP@基于纳的准固态聚合物电解质,用于工作可充电Na-O电池中的高迁移数
Xin He1,2, Youxuan Ni1, Wenjiao Ma2
1Frontiers Science Center for New Organic Matter, Renewable Energy Conversion and Storage Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China.
概括
可充电的氧电池实现稳定,高电流运行,使用一种新型的准固态聚合物电解质和渐变性MXene阳极. 这种组合克服了以前储能设备的局限性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 可充电的氧 (Na-O2) 电池具有高的理论能量密度,并利用丰富的资源.
- 在Na-O2电池中的液体电解质会带来风险,如树的生长,挥发性和泄漏.
- 准固体电解质旨在减轻这些风险,但在低运行电流密度下扎.
研究的目的:
- 为可充电Na-O2电池开发稳定的准固态聚合物电解质 (QPE) 和强大的阳极.
- 为了应对近固体Na-O2电池系统中低运行电流密度的挑战.
- 为了提高氧电池的循环稳定性和安全性.
主要方法:
- 制造一个聚乙烯化物-化-化重组Nafion (PVDF-HFP@Nafion) 基准固体聚合物电解质 (QPE).
- 开发一种基于MXene的阳极,具有梯度性结构 (M-GSS/Na).
- 在可充电Na-O2电池配置中对QPE和M-GSS/Na阳极进行协同测试.
主要成果:
- 该QPE表现出耐火性,液体锁定性和疏水性质.
- 在QPE中纳的纳入提高了Na+迁移数 (tNa+=0.68) 并促进了富含NaF的SEI形成.
- M-GSS/Na阳极显示出出色的树突抑制和循环稳定性.
- 组装的Na-O2电池在80个循环后,在1,000 mA g-1和1,000 mAh g-1时,表现出稳定的循环,具有较低的电位间隙 (0.166 V).
结论:
- 开发的QPE和M-GSS/Na阳极为准固体Na-O2电池稳定,高电流运行提供了可行的解决方案.
- 这项工作为推进氧储能系统的长期循环稳定性提供了一个有希望的途径.
- 这种协同作用的组合有效地抑制了树的生长,并提高了电池的整体性能.
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