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高性兴奋剂使得先进的离子电池能够实现超高功率密度

Mengjiao Sun¹, Yongjiang Sun¹, Hang Ma²

¹School of Materials and Energy, International Joint Research Center for Advanced Energy Materials of Yunnan Province, Yunnan University, Kunming 650091, China.

|May 9, 2025

概括

高性兴奋剂通过提高电子导电性和离子扩散来增强离子电池 (SIB) 阴极材料. 这一战略提高了先进的SIB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) 是离子电池的有希望的替代品,用于大规模储能,因为资源丰富.
Na3V2(PO4)2F3 (NVPF) 是一个潜在的SIB阴极材料,但其电子导电性低,循环稳定性差,能量密度低.

研究的目的:

为了提高离子电池的Na3V2(PO4)2F3 (NVPF) 阴极材料的性能.
调查高性兴奋剂对NVPF电子结构和离子扩散动力学的影响.
提高基于NVPF的SIB的能量密度,功率密度和循环稳定性.

主要方法:

使用多元元素低度兴奋剂的高的策略.
密度函数理论 (DFT) 计算分析电子结构和频段间隙.
先进的分析以研究空缺,V-O键收缩和离子重排.
电化学测试用于评估能量密度,功率密度和循环稳定性.

主要成果:

高性兴奋剂缩小了带间距从1.59到0.68 eV,显著提高了电子导电性.
该策略诱导了空缺,V-O键收缩,并优化了离子扩散通路.
杂的NVPF阴极在0.5°C时达到460.6 W h kg-1的能量密度,在100°C时达到15.3 kW kg-1的功率密度.
经过12,000个循环后,在50C时保持70.5%的容量,证明了特殊的循环稳定性.

结论:

高性兴奋剂是一种有效的策略,可以克服SIBs的NVPF阴极材料的局限性.
增强的电子导电性和改进的离子动力学导致了优越的电化学性能.
这项研究为下一代离子电池的开发提供了重大进展.

关键词:

酸正极是酸的正极之一.高效应的高效应高利率收费的收费方式离子电池离子电池超高功率密度的超高功率密度

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