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NbO2是一种高度稳定,超快速的离子和离子电池的阳极材料

Pallellappa Chithaiah¹, Ramesh Chandra Sahoo^2,3, Jun Ho Seok⁴

¹New Chemistry Unit, International Centre for Materials Science and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India.

ACS applied materials & interfaces

|September 22, 2023

概括

二氧化物 (NbO2) 显示为下一代离子电池 (LIB) 和离子电池 (SIB) 的稳定阳极材料,提供快速充电和优良容量保留.

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:

先进的阳极材料对于高性能离子电池 (LIB) 和离子电池 (SIB) 是至关重要的.
快速充电和长期稳定性是当前电池技术的关键挑战.

研究的目的:

用一种简单的方法合成二氧化 (NbO2).
为了评估NbO2作为LIB和SIB的阳极材料.
为了研究NbO2.2的电化学性能和稳定性.

主要方法:

对于NbO2.2,一个简单的合成策略.
对LIB和SIB的电化学测试 (特定容量,循环稳定性,速率能力).
密度函数理论 (DFT) 计算以了解性能机制.

主要成果:

对于LIBs:在100 mA g-1时的特异性容量为344 mAh g-1,在1000个周期内保持92%的容量,并快速充电 (30秒内充电83 mAh g-1).
对于SIB:在50 mA g-1时,特定容量为244 mAh g-1,在500个周期内保持70%的容量.
DFT分析确定了散装/表面充电,低离子扩散屏障和高电子导电率作为性能驱动因素.

结论:

对于先进的LIB和SIB来说,NbO2是一种有希望的,稳定的阳极材料.
该材料表现出极好的速度能力和循环寿命.
DFT的洞察力为NbO2的电化学行为提供了基本的理解.

关键词:

在 DFT 方面,它是最重要的.快速充电的阳极是一种快速充电的阳极.离子电池是一种离子电池.NbO2 的二氧化碳离子电池是一种离子电池.

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