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调节高压水性离子电池的birnessite中的Na含量和Mn缺陷

Xiaohui Zhu^1,2, Jing Xu³, Qinghua Zhang⁴

¹School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.

Nature communications

|April 23, 2025

概括

一种新的Na-丰富的birnessite电极材料显著提高了水性离子电池的性能. 这种先进的材料为下一代储能提供了更好的容量,稳定性和更高的操作电压.

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:

水性离子电池为离子电池提供了低成本,安全的替代方案.
Na-birnessite 是一个有前途的阴极材料,但受到有限的潜在窗口和低氧化还原活性的影响.
(Mn) 的迁移和结构降解阻碍了Na-birnessite在水性电解质中的表现.

研究的目的:

为水性离子电池开发一种先进的正极材料.
为了克服狭窄的潜在窗口和Na-birnessite中低氧化还原活性的局限性.
为了提高Na-birnessite的储存能力和结构稳定性.

主要方法:

合成一种富含Na的伯尼石 (NaMnO₂•0.1H₂O),具有高度有序的分层结构.
作为正电极材料的富含Na的birnessite的电化学表征.
使用Na_xH_2-xTi₂O₅作为负电极的水性全细胞原型的制造和测试.

主要成果:

富含Na的伯尼石具有1.4V的上方充电切断潜力 (相对于Ag/AgCl).
在0.2 A g-1下实现了199.9 mAh的增强特异性容量.
该材料的结构稳定性大大提高,抑制了的迁移.
一个完整细胞原型 (Na_xH_2-xTi₂O₅,但又只有NaMnO₂•0.1H₂O) 实现了117.1Wh kg^{-1的特定能量和长周期寿命.}

结论:

富含Na的比尔内赛特是水性离子电池的高效正极材料.
优化层间化学和减轻结构缺陷对于增强离子储存至关重要.
这项工作为开发具有较大特定能量的高压水性电池铺平了道路.

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