相关实验视频
Updated: Aug 5, 2026

07:23
Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
32.5K
表面空隙工程重新路由稳定丰富层级阴极的第一循环再氧化
Seongkoo Kang1, Dayeon Choi1, Suwon Lee1
1Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea.
Angewandte Chemie (International ed. in English)
|November 5, 2025
概括
富含的层状氧化物中工程表面障碍可以防止氧气释放和晶格崩. 这提高了高能量密度阴极的第一循环效率和耐用性.
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
- 表面化学 表面化学
背景情况:
- 富层氧化物 (LRLO) 对高能量密度电池具有前景.
- 第一个周期的性能下降,包括氧气释放和晶格崩,限制了LRLO的应用.
- 控制表面化学是缓解这些降解途径的关键.
研究的目的:
- 调查原子尺度的表面障碍如何影响LRLO中的氧化还原序列.
- 为提高Li1.14Ni0.32Mn0.54O2 (LNMO) 阴极的电化学性能和稳定性制定一个战略.
- 建立耐用LRLO阴极的一般设计原则.
主要方法:
- 用化学处理在LNMO中引入表面氧气和过渡金属空缺.
- 多模态同步子分析 (例如,X射线衍射,X射线吸收光谱) 用于表征表面结构和氧化状态.
- 电化学测试用于评估第一周期库伦比克效率,电压衰减和容量保留.
主要成果:
- 在LNMO中成功地引入了表面空白,局限于粒子表面.
- 经过处理的LNMO表现出低于4.4V的早期氧化和延迟的氧化.
- 观察到抑制有害的Ni4+─O共价状态,不可逆转的氧气释放和溶解.
- 修改后的氧化还原路径在高电压下保持了金属-氧气协调.
结论:
- 原子尺度的表面干扰有效地控制了LRLO中的第一循环氧化还原序列.
- 工程表面空隙防止氧气释放和晶格崩,提高电化学性能.
- 这项工作为开发稳定,高能量密度的LRLO阴极提供了一般的设计策略.
相关概念视频
Gas Exchange and Transport
Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
The Electron Transport Chain
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...
Microbial Fuel Cells
Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...
Bioreactor Controls-II
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...

