过渡金属板滑动:在P2型过渡金属氧化物阴极中激活阳离子氧化反应的一个关键过程.
Dongxiao Wang1, Feihu Zou1, Weiguang Lin2
1Materials Genome Institute, Shanghai University, Shanghai, 200444, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 3, 2025
概括
离子电池中的阳离子氧化还原是阴极性能的关键. 这项研究揭示了离子电池阴极中的Ti4+替代如何激活可逆氧氧氧化还原反应,提高能量密度.
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:
- 阴离子氧化还原化学显著影响离子电池中的层叠氧化物阴极性能.
- 驱动离子氧化还原的确切机制,特别是在过渡金属-静态氧化物中,仍然不清楚.
- 现有的模型侧重于Na-O-A配置,这些配置不适用于所有显示氧氧氧化还原的系统.
研究的目的:
- 研究用于离子电池的过渡金属-静态度P2型分层氧化物阴极中的可逆阴离子氧化还原机制.
- 阐明Ti4+替代在激活氧氧还氧反应中的作用.
- 为了提高离子电池阴极的能量密度和稳定性.
主要方法:
- 合成和表征P2型Na2 / 3Cu1 / 3Mn2 / 3O2及其Ti4+替代模拟物 (Na2 / 3Cu1 / 3Mn1/ 2Ti1/ 6O2) 的合成和表征.
- 电化学测试,包括静电循环,以评估容量和稳定性.
- 结构分析以了解Ti4+替代对过渡金属层安排和迁移的影响.
主要成果:
- Ti4+的替代破坏了有序的过渡金属层,促进了板块的滑动和迁移.
- 在Ti4+替代后形成新的Na-O空位配置,使可逆氧氧还原.
- 用Ti4+替代的阴极 (Na2/3Cu1/3Mn1/2Ti1/6O2) 在2C300次循环后,实现了153mAhg-1的初始放电容量和80%的保留率.
结论:
- Ti4+替代是一种有效的策略,用于激活过渡金属-立体测量层氧化物阴极中的可逆阴离子氧化还原.
- 该研究提供了超出Na-O-A配置的氧氧还氧化机制的见解.
- 这项研究提供了改善离子电池能量密度和循环寿命的途径.
更多相关视频
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
1.9K
07:55Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
12.6K
相关概念视频
Properties of Transition Metals
24.6K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
24.6K
Electrodeposition
467
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
467
Voltaic/Galvanic Cells
55.4K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
55.4K
Oxidation-Reduction Reactions
63.9K
Oxidation–Reduction Reactions
63.9K
Corrosion
23.5K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
23.5K
Oxidation Numbers
36.5K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
36.5K
