激活可逆V4+/V5+ 离子电池的高热量替代NASICON型酸盐阴极中的氧化对
Siya Wang1,2, Jin Bai1, Peiyao Wang1
1Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|January 28, 2025
概括
高材料通过提高导电性和结构稳定性来改善离子电池阴极. 这项研究表明,高性纳西康材料具有可逆的V4+/V5+氧化还原对,实现了出色的容量和循环性能.
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:
- 基于的NASICON材料是离子电池 (SIB) 的有希望的阴极,因为它们的结构稳定性和离子扩散通道.
- 然而,电导率差和能量密度有限阻碍了它们的实际应用.
- 激活V4+/V5+氧化还原对可以增加能量密度,但往往会导致不可逆转的相位过渡和结构退化.
研究的目的:
- 为了解决SIBs的基于的NASICON材料的局限性.
- 为了提高电导率,能量密度和循环稳定性.
- 研究高调节对晶体结构和相位过渡可逆性的影响.
主要方法:
- 适用于NaxVM(PO4) 3材料的高调节策略.
- 高材料Na3.2V1.5Fe0.1Al0.1Cr0.1Mn0.1Cu0.1的合成和表征 (NVMP-HE) PO4) 3).
- 电化学性能测试 (容量,循环稳定性,速率能力) 和现场X射线衍射 (XRD) 分析.
主要成果:
- 高材料 (NVMP-HE) 呈现出激活的可逆V4+/V5+氧化还原对,稳定的结构和快速的电化学动力学.
- 在0.1°C的温度下达到120.1mAhg-1的特定容量,在20°C的1000个循环后保持92.4%的容量.
- 在现场的XRD证实了平稳的三相过渡以及促进快速相变的中相的存在.
结论:
- 高调节是一种有效的策略,用于优化NASICON类型SIBs的阴极材料.
- 开发的NVMP-HE材料表现出卓越的电化学性能,克服了以前的限制.
- 这些发现为先进的高性能离子电池阴极铺平了道路.
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