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Na₃V₂(PO₄) ₃被装饰为Na₃V₂(PO₄) ₂F₃作为离子电池的高速率和循环稳定的阴极材料

Yi Yang¹, Guo-Rong Xu¹, An-Ping Tang¹

¹School of Chemistry and Chemical Engineering, Hunan University of Science and Technology Xiangtan 411201 Hunan China 278789069@qq.com.

|April 16, 2024

概括

一种新的复合阴极材料Na3V2(PO4)2.75F0.75/C (NVPF·3NVP/C) 提高了离子电池的性能. 这种材料提供了更好的导电性和更高的电压平台,提高了先进电池应用的能量密度和循环稳定性.

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) 对大规模储能充满希望.
Na3V2(PO4)3 (NVP) 是一种潜在的SIB阴极材料,但具有较差的导电性和低电压.
提高NVP的电化学性能对于实际的SIB应用至关重要.

研究的目的:

合成复合性阴极材料以改善NVP的电化学特性.
为了研究Na3V2(PO4)2F3 (NVPF) 和碳涂层的NVP的协同作用.
为了评估NVPF·3NVP/C复合材料在离子电池应用中的性能.

主要方法:

用于合成Na3V2(PO4)2.75F0.75/C (NVPF·3NVP/C) 复合物的Sol-gel技术.
酸衍生碳涂层以创建3D导电网络.
电化学表征包括放电能力,速率能力和循环稳定性测试.

主要成果:

该NVPF·3NVP/C复合物在0.1C温度下表现出120.7mA hg-1的放电能力,超过纯NVP.
在10C的高速度下,可逆容量为110.9 mA hg-1保持在10C的高速度下.
该材料在200个循环后保留了64.1%的容量,显示出良好的循环稳定性.

结论:

该NVPF·3NVP/C复合物有效地提高了电子导电性和离子扩散.
NVPF和NVP之间的协同效应,以及碳涂层,改善了电化学性能.
优化的复合材料显示出作为离子电池的高性能阴极材料的潜力.

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