揭示了多层丰富氧化物阴极的降解途径
Zhimeng Liu1, Yuqiang Zeng2,3, Junyang Tan4
1School of Chemical Engineering, Sichuan University, Chengdu, China.
Nature nanotechnology
|September 2, 2024
概括
多层丰富的过渡金属氧化物显示出对高能电池的前景,但容量减弱. 这项研究揭示了氧气缺陷和超快的离子运动如何导致结构变化,导致电池退化.
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
- 电池技术 电池技术
背景情况:
- 富含的多层过渡金属氧化物为电池提供高能量密度.
- 实际使用受到容量衰减和电压衰减的限制,原因尚未完全理解.
研究的目的:
- 阐明丰富的过渡金属氧化物层次结构恶化的潜在机制.
- 确定导致容量衰减和电压衰减的特定途径.
主要方法:
- 集成的纳米尺度到微观尺度的表征.
- 对形态,结构和氧化状态进化的分析.
- 对粒子内部异质反应的研究.
主要成果:
- 确定了由粒子内部异质反应驱动的独特的结构变化途径.
- 揭示了氧缺陷引发相位转换和纳米形状的形成.
- 由于超快速的 (de) 间隔,观察到氧气扭曲主导的晶格移位和过渡金属离子溶解.
结论:
- 不均的结构变化,包括粒子裂变和膨胀,是导致初始库伦比效率低下和循环降解的原因.
- 了解这些降解途径对于开发更稳定的高能电池至关重要.
更多相关视频
相关概念视频
01:08Electrodeposition
613
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...
613
03:12Batteries and Fuel Cells
27.2K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.2K