空心外Na4Fe2.4Ni0.6(PO4)2P2O7与微小空隙空间能够快速充电和低温储存
Xinran Qi1,2, Hanghang Dong3, Hao Yan4
1Department of Chemistry, College of Science, Hebei Agriculture University, Baoding, 071001, P.R. China.
Angewandte Chemie (International ed. in English)
|June 18, 2024
概括
这项研究开发了用于离子电池的空心外正极材料,以提高快速充电和低温性能. 这种新的结构可以提高导电性和离子扩散,从而更好地储存能量.
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:
- 由于资源丰富,离子电池 (SIB) 对电网存储充满希望.
- 铁基聚离子酸盐,如Na4Fe3(PO4)2P2O7 (NFPP),具有成本效益,但具有较差的导电性和缓慢的离子扩散.
- 这些限制阻碍了SIB的快速充电和低温性能.
研究的目的:
- 为SIBs合成了一种具有增强电化学性能的新型空心外阴极材料.
- 为了解决基于铁的聚离子酸盐中低导电性和缓慢离子扩散的局限性.
- 为了实现卓越的快速充电和低温储存能力.
主要方法:
- 通过喷雾干燥和化,利用空心外Na4Fe2.4Ni0.6(PO4)2P2O7 (THoCS-0.6Ni) 的可扩展,单步合成.
- 加入 (Ni) 异原子合剂来调节晶格结构并提高内在导电性.
- 使用酸和聚乙烯罗利的组合来控制形态,并创建相互连接的碳网络.
主要成果:
- 该THoCS-0.6Ni材料呈现出独特的空心外结构,具有微小的空隙空间和相互连接的碳网络.
- 实现了卓越的速率能力,在25°C下提供86.4mAhg-1的功率.
- 在低温下表现出异常的循环稳定性,在 -20°C和5°C的2500个循环后保持43.6 mAh g−1 .
- 尼兴奋剂有效地提高了电子导电性,并优化了Na+扩散通路.
结论:
- 开发的THoCS-0.6Ni材料显著改善了SIB中的快充和低温存.
- 空的核心外结构与空隙空间有效地容纳体积膨胀,并促进离子运输.
- 这项工作为设计高性能可逆电池的先进阴极材料提供了一种多功能策略.
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