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Updated: Jun 6, 2025

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一个分层的氧化物阴极的结构障碍,为其理论容量铺平了可逆相位过渡路径

Suwon Lee¹, Seongkoo Kang¹, Youngju Choi¹

¹Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.

Journal of the American Chemical Society

|November 22, 2024

概括

我们通过在Li-birnessite中创造受控的混乱来稳定层次的氧化物, 这一突破提升了电化学循环的实用性.

科学领域:

材料科学
电化学
固态化学

背景情况:

多层氧化物由于Mn迁移和Jahn-Teller效应 (JTE) 诱导的相变而面临容量衰减.
目前用于缓解JTE的兴奋剂策略不足以防止结构崩.
这限制了这些有前途的阴极材料的商业可行性.

研究的目的:

开发一个稳定的氧化物阴极材料.
克服氧化物的结构不稳定性和容量色的局限性.
通过受控的结构障碍实现可逆电化学循环.

主要方法:

通过Li-Na离子交换和优化脱水合成的转移性Li-birnessite具有受控的结构障碍.
使用软X射线吸收光谱 (sXAS) 和对分布函数 (PDF) 分析研究了Mn氧化还原行为和局部结构.
在循环中与电化学性能相关的结构发现.

主要成果:

通过抑制的迁移和溶解,实现了无序的Li-birnessite结构.
证明可逆电化学循环没有显著的结构崩.
观察到抑制的相位过渡和可逆的Mn氧化还原行为.

结论:

控制 Li-birnessite 的静态干扰对于提高结构稳定性和电化学可逆性至关重要.
这种方法克服了多层氧化物中和迁移的局限性.
这些发现为利用层状氧化物更接近它们的理论能力铺平了道路.

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Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.