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聚氨酸涂层Na₃V₂(PO₄) ₂F₃ 阴极使可充电电池的离子迅速扩散和结构稳定

Kahla Missaoui¹, Karima Ferchichi¹, Noureddine Amdouni¹

¹Laboratory of Characterizations, Applications and Modeling of Materials, Faculty of Sciences of Tunis-University of Tunis El Manar, Campus Farhat Hached, B.P. n° 94 - Rommana, Tunis 1068, Tunisia.

ACS applied materials & interfaces

|July 31, 2024

概括

聚氨涂层可以提高离子电池中的超离子导体 (NVPF) 性能. PANI@NVPF复合材料显示了提高速率能力和扩散,使其成为一个有前途的阴极材料.

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) 对于电网规模的能源存储至关重要.
超离子导体 (NASICON) 材料如Na3V2(PO4) 2F3 (NVPF) 作为SIB阴极具有前景,但电子导电性较差.
提高NVPF的电子导电性对于高性能SIB至关重要.

研究的目的:

制定一种提高NVPF电化学性能的策略.
为了合成和表征一种新型聚氨 (PANI) @NVPF复合材料.
评估PANI@NVPF作为高速率离子电池应用中的阴极的适用性.

主要方法:

使用皮克林乳液方法制造PANI@NVPF纳米复合材料.
X射线衍射 (XRD) 和拉曼光谱证实了成功的PANI涂层,而不会改变NVPF结构.
热重力测量分析 (TGA) 和扫描电子显微镜 (SEM) 评估了热稳定性和形态.
使用试验细胞评估了电化学性能,包括速率能力和循环稳定性.
现场电子磁共振 (EPR) 研究了在循环过程中的价值状态.

主要成果:

PANI涂层成功地增强了NVPF的界面粘合和电子导电性.
与原始NVPF相比,PANI@NVPF纳米复合材料表现出更好的速率性能,2%的PANI@NVPF在5C时保持了70%的容量.
现场EPR证实了在电化学循环过程中混合V4+/V3+价值状态的存在.
随着循环,的扩散系数增加,达到大约3.25 × 10^-11 cm^2 s^-1.
在NVPF框架内,PANI涂层改善了扩散通道.

结论:

聚氨涂层是一种有效的策略,可以改善离子电池中NVPF的电化学性能.
PANI@NVPF纳米复合材料展示了增强的速率能力和改进的离子扩散.
这些发现凸显了PANI@NVPF作为高速离子电池应用的有希望的阴极材料.

关键词:

Na3V2(PO4)2F3 (NVPF) 是一个可靠的组合.帕尼·帕尼 (PANI PANI) 是一个名字.复合材料是一种复合材料.导电聚合物的聚合物.离子电池是一种离子电池.

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