同时修改Al3+/F-代用,为Na3V2建立一个坚固的框架,具有高热稳定性和近零应变性能
Haodi Dong1,2, Shengsi Wang1,2, Changcheng Liu1,2
1School of Environment and Safety Engineering, North University of China, Taiyuan 030051, Shanxi, People's Republic of China.
ACS applied materials & interfaces
|September 16, 2024
概括
这项研究通过用和对Na3V2(PO4) 3 (NVP) 进行兴奋剂,并用碳纳米管 (CNTs) 进行涂层,从而提高离子电池的性能. 修改后的NVP显示了先进的储能容量,稳定性和热安全性的提高.
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) 面临Na3V2(PO4)3 (NVP) 的挑战,原因是电子导电性差,循环稳定性差.
- 提高NVP绩效对于开发高效和持久的SIB至关重要.
研究的目的:
- 为了提高Na3V2(PO4)3 (NVP) 的电化学性能和稳定性,用于离子电池.
- 研究F/Al兴奋剂和碳纳米管 (CNT) 包装对NVP属性的协同效应.
主要方法:
- 用于合成F/Al-doped和CNT包裹的NVP材料的Sol-gel方法.
- 进行了电化学测试 (容量,循环稳定性,速度能力) 和结构分析 (XRD,XPS).
- 评估了循环过程中的热稳定性和体积变化.
主要成果:
- 经过修改的FAl-2材料在0.1C时表现出115.8mA hg-1和在60C时89.3mA hg-1的高容量.
- 获得了优异的循环稳定性,在2000个循环后保留了83.8 mA h g-1 (93.84%的保留率).
- FAl-2 展示了接近零的应变特性,体积收缩率低 (0.328%-1.075%),结构稳定性强,热稳定性优越.
结论:
- 协同的F/Al兴奋剂和CNT包装显著提高了NVP的电子导电性,结构完整性和Na+离子迁移.
- 修改后的FAl-2材料显示出作为离子电池的高性能阴极的巨大潜力.
- 改进的热稳定性为电池管理系统设计提供了洞察力.
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