一个功能化的多孔Al电流采集器可以实现高能量密度的无阳极Na电池
Yongling An1, Zhihao Pei1, Deyan Luan1
1Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China.
Science advances
|August 20, 2025
概括
研究人员开发了一种功能化的多孔电流收集器,以防止在无阳极电池中形成树脂. 这种创新提高了实际应用的能量密度和循环稳定性.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 无阳极 (Na) 电池承诺高能量密度,但面临的挑战是由于树体的形成和体积变化而导致的快速容量衰减.
- 控制金属沉积对于稳定高效的无阳极电池运行至关重要.
研究的目的:
- 设计和研究一个功能化的多孔 (Al) 电流采集器,用于调节无阳极Na电池中的增长.
- 通过抑制树突形成,提高无阳极Na电池的能量密度和循环稳定性.
主要方法:
- 使用无模板电和物理分离的功能化的多孔Al电流采集器的制造
- 孔隙结构及其对离子流和电流密度分布的影响.
- 使用开发的Al电流采集器对无阳极Na电池进行电化学测试.
主要成果:
- 孔隙性Al电流采集器具有相互连接的带通道网络,减少结构应力并抑制树突形成.
- 在Al宿主上丰富的sodiophilic网站促进同质的Na核化并提高反应动力学.
- 没有极的Na电池显示出没有基的Na涂层/脱落,具有很高的可逆性.
- 一个4.3V级袋式电池在100个循环中实现了420.4Wh/kg的能量密度和84.9%的容量保留.
结论:
- 功能化的多孔Al电流采集器有效地控制了Na的生长,从而实现了无树的涂层和剥离.
- 这种方法为开发高能量密度和稳定的无阳极Na电池提供了可行的途径.
- 这项研究强调了定制电流收集器在推进下一代电池技术方面的潜力.
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