阶段净化和结晶学工程使快速充电Na5Fe2.9Ni0.1(PO4)2(P2O7) 宽温度离子电池的阴极成为可能
Xu Yang1, Ziwei Liu2, Lingfeng Shi2
1Key Laboratory of Agricultural Functional Molecule Design and Utilization of Heilongjiang Province, College of Arts and Sciences, Northeast Agricultural University, Harbin, 150030, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 16, 2025
概括
阶段净化离子电池阴极,Na5Fe2.9Ni0.1(PO4)2(P2O7),通过提高导电性和减少扩散障碍,显示出更好的快速充电和广泛温度性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (SIB) 由于大量的,对储能充满希望.
- 聚酸阴极,如Na4Fe3(PO4)2(P2O7) (NFPP),提供无毒性和结构稳定性.
- NFPP的实际应用受不活性NaFePO4杂质和低电子导电性限制,妨碍快速充电和广泛温度使用.
研究的目的:
- 开发一个没有NaFePO4杂质的相净化NFPP阴极.
- 为了增强电子导电性,并降低阴极材料的离子扩散屏障.
- 提高SIB的快速充电能力和广泛的温度适用性.
主要方法:
- 通过Na的丰富和Ni的引入合成了Na5Fe2.9Ni0.1(PO4)2(P2O7) (N5FNPP).
- 利用DFT计算来预测Ni结合对电子结构和离子扩散的影响.
- 电化学性能特征,包括容量,速率能力,循环稳定性和温度依赖性.
主要成果:
- 实现了相净化N5FNPP阴极材料,具有高电子导电性和低Na+扩散屏障.
- 证明了出色的放电能力 (112.9 mAh g-1 在0.1 C) 和出色的快速充电性能 (87.1 mAh g-1 在10 C).
- 在2000个循环中保持95%的容量,在广泛的温度范围 (-3060°C) 中表现出色.
结论:
- 合和相位净化有效地解决了NFPP阴极的局限性.
- 开发的N5FNPP材料是先进的快充和宽温度SIB的可行候选者.
- 这项工作为SIBs设计高性能聚离子酸盐阴极提供了策略.
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