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P2,O3相对双相层氧化物的协同作用,提高了储存的电化学性能

Yu Duan¹, Zi-Han Ma¹, Ying-Ying Huang¹

¹School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China.

Journal of colloid and interface science

|December 6, 2024

概括

这项研究合成了稳定的P2/O3双相层氧化物阴极,用于离子电池. 合并的P2和O3相增强了结构稳定性和储能,提高了电化学性能.

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
固态化学固态化学

背景情况:

层状氧化物是下一代离子电池的有希望的阴极材料.
在分层氧化物中,P2和O3相对电化学性能具有明显的优势.
优化不同阶段之间的协同作用对于提高电池容量和稳定性至关重要.

研究的目的:

合成和描述一个热力学和动力学稳定的P2/O3双相层氧化物阴极材料.
研究由P2和O3相的协同效应引起的电化学性能提升.
探索Fe替代对减轻Jahn-Teller效应和改善整体阴极性能的影响.

主要方法:

高温固态合成K0.05Na0.8Ni0.5Mn0.5O2.2. 的高温固态合成
电化学测试包括高电流密度的静电循环.
在现场进行X射线衍射 (XRD),以阐明循环过程中的结构演变.
密度功能理论 (DFT) 计算以验证双相结构的可行性.

主要成果:

成功合成了一种稳定的P2/O3双相层氧化物K0.05Na0.8Ni0.5Mn0.5O2.
与单相材料相比,双相材料的结构稳定性得到改善,储能增加.
在Ni-Mn基层氧化物中的Fe替代减轻了Jahn-Teller效应,从而提高了电化学性能.
在200 mA g-1下,Fe-doped标本实现了102.8 mAh g-1的初始放电容量,在200 个循环后保持了83.17%的容量.

结论:

P2/O3双相结构有效地利用了两个相的优势,提高了离子电池阴极性能.
替代是一种可行的策略,可以改善基于Ni-Mn的分层氧化物的电化学特性.
该研究提供了一个有前途的双相阴极材料和未来离子电池开发的理论见解.

关键词:

阴极材料的材料是正极材料.费尔多芬使用兴奋剂 P2/O3 两相结构的结构离子电池是一种离子电池.

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