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在Birnessite的Al Pinning效应,用于高性能离子储存

Chao Cheng¹, Shuyang Bian¹, Yurong You¹

¹School of Materials Science and Engineering, Southeast University, Nanjing, 211189, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|October 3, 2025

概括

在birnessite中的钉增强了结构稳定性和离子扩散动力学,用于水性能量储存. 这种Al-pinned材料表现出强大的循环性能,超过了以前的离子电池阴极.

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:

层状伯尼石是水性能量存储的有前途的阴极材料,因为它具有氧化还原活性和离子扩散通道.
然而,birnessite在离子 (NH4+) 电池中遭受结构崩和缓慢动力学的影响,主要是由于Jahn-Teller效应和扩散限制.

研究的目的:

为了研究 (Al) 固定对分层伯尼石的结构稳定性和NH4+离子储存性能的影响.
为了应对NH4+离子电池中结构崩和慢离子扩散动力学的挑战.

主要方法:

合成Al-pinned birnessite (Na0.7Al0.1Mn0.9O2) 的合成方法.
对循环稳定性和速率能力进行电化学测试.
密度函数理论 (DFT) 计算以阐明 Al 固定的机制.

主要成果:

钉显著提高了结构稳定性,并抑制了birnessite中的Jahn-Teller效应.
最佳的Na0.7Al0.1Mn0.9O2阴极在1.0 A g-1.1下,在5000个循环中表现出显著的循环稳定性.
结加速NH4+离子扩散,达到1.58 × 10−9 cm2 s−1的扩散系数,大约是原始Birnessite的5倍.

结论:

在birnessite中的Al固定效应是克服NH4+离子电池结构不稳定性和运动限制的有效策略.
分层Na0.7Al0.1Mn0.9O2显示出作为高性能水性NH4+离子电池的阴极材料的优秀潜力.
这项工作为先进的离子电池系统的合理材料设计提供了洞察力.

关键词:

艾尔·皮宁 (Al-pinning) 是一种结方式.一个比尔尼斯网站.杰恩·泰勒扭曲的扭曲氨离子扩散动力学水性离子电池水性离子电池

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