一种实验方法来评估融入无序的岩盐氧化物阴极中的
Raynald Giovine1,2, Eric Yoshida1,2, Vincent C Wu1,2
1Materials Department, University of California, Santa Barbara, Santa Barbara, California 93106, United States.
Chemistry of materials : a publication of the American Chemical Society
|April 29, 2024
概括
新的分析方法可以准确地测量石盐氧化物 (DRX) 阴极中的. 水洗技术提高了DRX性能,提高了离子电池的容量和循环寿命.
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:
- 无序的岩盐氧化物 (DRX) 是有希望的高能量密度的离子阴极.
- 在DRX中替代可以增强电化学性质,但很难控制和描述.
- 现有的分析技术难以区分和氧,难以处理DRX中的无形杂质.
研究的目的:
- 开发一种可靠的多步骤方法来评估DRX阴极中的合物.
- 优化合成策略,以提高含量和减少杂质.
- 为DRX材料建立有效的合成后净化方法.
主要方法:
- 开发了一种多步分析方法来量化DRX中的,克服了X射线/中子技术和无形杂质的挑战.
- 使用固态合成来准备初始的DRX样品,然后进行组合分析.
- 机械化学合成被用来达到更高的化水平.
- 开发了一种水洗程序,以去除杂质.
主要成果:
- 开发的方法揭示了最初合成的DRX (Li 1.25 Mn 0.25 Ti 0.5 O 1.75 F 0.25) 中的低含量和显著的LiF杂质.
- 组合优化导致了一种新的合成产品 (Li 1.25 Mn 0.225 Ti 0.525 O 1.85 F 0.15),具有降低的LiF和改进的DRX固体测量.
- 机械化学合成实现了更高的化水平.
- 1.25 Mn 0.25 Ti 0.50 O 1.75 F 0.25的水冲洗导致初始放电容量增加了约10%,容量保留增加了约11%.
结论:
- 新的分析方法准确量化了DRX材料中的.
- 优化合成和净化策略对于开发高性能DRX阴极至关重要.
- 水洗程序提供了一种简单而有效的方法来提高DRX材料的电化学性能.
- 这项工作为推进下一代DRX离子电池阴极的设计规则提供了必要的工具.
相关概念视频
02:42Ionic Crystal Structures
14.3K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.3K
01:08Sample Preparation for Analysis: Advanced Techniques
328
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
328
03:46Qualitative Analysis
22.3K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
22.3K
03:07Electron Affinity
35.5K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
35.5K