具有3D有序通道和多功能组的共价有机框架赋予Zn阳极卓越的稳定性
Bin Li1, Pengchao Ruan2, Xieyu Xu3
1School of Chemical Engineering, North China University of Science and Technology, Tangshan, 063009, People's Republic of China.
Nano-micro letters
|January 4, 2024
概括
在金属阳极上的一种新型化型共价有机框架中间层 (COF-S-F) 防止了水性离子电池 (AZIB) 中的树生长和副作用. 这提高了可持续能源应用的电池性能和寿命.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性离子电池 (AZIB) 对于可持续能源至关重要,但它们的性能受到树生长和副作用的限制.
- 开发强大的金属阳极是推动AZIB技术实现碳中和未来的关键.
研究的目的:
- 为AZIB中的金属阳极设计一个稳定的人工固体电解质接口 (SEI).
- 抑制不受控制的沉积和有害的副作用反应,从而提高电池循环寿命和效率.
主要方法:
- 在Zn金属 (Zn@COF-S-F) 上制造一种含硫酸组 (COF-S-F) 作为中间层的化型共价有机框架.
- 描述COF-S-F介层对离子溶解和运输的影响.
- 在各种电流密度和循环计数下测试Zn@COF-S-F对称细胞和Zn@COF-S-F紫外线MnO2全细胞.
主要成果:
- Zn@COF-S-F 阳极表现出没有树突的形态和抑制的副作用.
- 对称细胞在1000小时内表现出稳定的循环,低电压歇斯底里 (50.5mV在1.5mA cm−2) 时).
- 完整电池在800个循环后在1.2A g-1下实现了206.8 mAh g-1的放电容量,容量保持率为87.9%.
结论:
- 开发的人工SEI有效调节沉积并减轻副作用.
- 人工SEI层的有针对性的设计是实际高性能AZIB的有希望的策略.
- 这种方法显著提升了AZIB在大规模储能应用中的潜力.
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