优化化策略,以利用氧化实现有效的谷物边界修改,以实现稳定循环的丰富阴极
Xiaopeng Cheng1, Tengfei Yan1, Dechen Qin1
1College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, PR China.
ACS applied materials & interfaces
|February 20, 2025
概括
使用快速加热和原子层沉积的谷物边界工程增强了高的阴极材料. 这种方法提高了循环稳定性和容量保留,用于先进的电池应用.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高层氧化物阴极材料对于高能量密度电池至关重要.
- 对于谷物边界工程而言,传统的化可能会导致有害的相位转换和性能降低.
- 需要有效的策略来提高这些正极材料的电化学稳定性.
研究的目的:
- 为LiNi0.83Mn0.05Co0.12O2阴极材料开发一种改进的颗粒边界工程方法.
- 提高电化学性能,特别是循环稳定性和容量保留.
- 为了减轻与高层氧化物中高温回火相关的性能问题.
主要方法:
- 采用一种谷物边界工程策略,将快速加热到热温度与原子层沉积 (ALD) 结合起来.
- 使用快速加热来最大限度地减少/氧的损失,并防止无序的相位形成.
- 研究了谷物边界修改和散装梯度兴奋剂,以减少循环过程中的结构降解.
主要成果:
- 快速加热过程有效地防止了不可逆转的相变和结构损坏.
- 修改的颗粒边界和梯度兴奋剂显著减少了阴极裂纹和侵蚀.
- 直接加热样本显示出优异的容量保留,在C/3.3的300个循环后达到84.7%.
结论:
- 提出的快速加热和ALD方法是谷物边界工程的可行和低成本策略.
- 这种方法显著提高了高层氧化物阴极的循环稳定性和电化学性能.
- 这些发现为开发下一代电池的先进阴极材料提供了有希望的途径.
相关概念视频
00:46Bioremediation
17.5K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
17.5K
01:15Metabolism of Chemolithotrophs
1.3K
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
1.3K
01:28Carbon-dioxide Fixation
885
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
885
01:27Microbes and Climate Change
103
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
103
01:18Bioreactor Controls-II
82
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...
82
01:28Methods of Medium Optimization
74
Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...
74