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多功能Na₂TiO₃ 具有涂层功能的高压和电容式的离子储存Na_0.44MnO₂

Yuge Cao¹, Meijing Xiao¹, Wujie Dong¹

¹State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.

ACS applied materials & interfaces

|August 16, 2023

概括

用-2氧化物涂覆-0.44氧化物纳米棒可以通过防止溶解和改善离子传输来提高离子电池的性能,从而提高容量和稳定性.

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:

离子电池对大规模储能充满希望,但面临着低能量密度和低速率性能的挑战.
道型Na0.44MnO2是一种潜在的阴极材料,但患有溶解和结构不稳定性.
需要有效的策略来提高Na0.44MnO2阴极的电化学特性和耐用性.

研究的目的:

为了提高离子电池的Na0.44MnO2阴极材料的能量密度,速率能力和循环稳定性.
在Na0.44MnO2纳米棒上研究Na2TiO3涂层的多功能作用.
探索Na2TiO3涂层和Ti-doping对离子运输和结构完整性的协同效应.

主要方法:

用Na2TiO3层涂覆的Na0.44MnO2纳米棒的合成.
使用电化学技术进行涂层材料的表征 (容量,速率性能,循环稳定性).
分析涂层对离子扩散通路和结构稳定性的影响.

主要成果:

优化的3%重量Na2TiO3涂层Na0.44MnO2的初始容量为127 mAhg-1在2 - 4.5V.
涂层材料表现出96.7%的超高电容式容量比率和出色的速率性能 (80.2mAhg-1在20C).
Na2TiO3涂层显著提高了高压稳定性,在20°C的900个循环后保持了97.7%的容量.

结论:

Na2TiO3涂层有效抑制Mn溶解,并增强Na0.44MnO2.2的结构稳定性.
联合涂层和Ti-doping创造了额外的离子扩散通路,提高了速率的性能.
这种方法为开发高性能离子电池提供了可行的策略.

关键词:

纳米0.44MnO2 阴极这就是Na2TiO3的含量.电容式的类似的储存器.高电压的高电压的高电压表面涂层是一种表面涂层.

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