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NaNbV ((PO₄) ₃:用于具有优异速率能力的纳离子电池的多电子纳西康型阳极材料

Nellie R Khasanova¹, Rodion V Panin¹, Ilia R Cherkashchenko^1,2

¹Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, Moscow 119991, Russia.

ACS applied materials & interfaces

|June 17, 2023

概括

一种新的NASICON型,和酸材料使高性能离子电池成为可能. 这种电极材料提供180mAh·g-1的可逆容量和卓越的循环稳定性,用于先进的能量存储.

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:

离子电池是离子电池的有希望的替代品,因为的丰富含量.
开发高性能电极材料对于推进离子电池技术至关重要.

研究的目的:

为离子电池应用合成和表征纳西康型NaNbV(PO₄) ₃电极材料.
研究材料在循环过程中的电化学性能,反应机制和结构演变.

主要方法:

材料合成的 Pechini 溶凝技术.
在Na-ion电池中进行电化学测试.
操作和现场X射线衍射 (XRD) 用于结构分析.
电子结构研究的X射线吸收近边缘结构 (XANES) 光谱.

主要成果:

NaNbV(PO₄) ₃材料表现出一个可逆的三电子反应,涉及Nb⁵⁺/Nb⁴⁺,Nb⁴⁺/Nb³⁺,和V³⁺/V²⁺的氧化还原过程.
在1.55V与Na+/Na.的平均电位下,实现了180mAh·g-1的高可逆容量.
该材料表现出极好的循环稳定性,在10°C下保持144mAh·g-1的电量,并且具有可逆的结构演变.

结论:

纳西康型NaNbV ((PO₄) ₃是用于高功率和长寿命离子电池的优质阳极材料.
该材料的坚固框架和多电子还氧化能力有助于其优异的电化学性能.

关键词:

这是NASICON型结构结构.离子电池离子电池阳极材料是一种阳极材料.多个电子的反应反应.操作的是XANES.运行着衍射的作用.利率能力能力的速度.

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