在Na-O配置上进行高度调制,以实现超稳定的层氧化物
Hao Chen1, Ziming Wang1, Yu Shi1
1School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.
Small (Weinheim an der Bergstrasse, Germany)
|May 9, 2025
概括
高层氧化物增强离子电池的阴极稳定性. 这种新材料HE-NaMFN在暴露在空气中30天后显示出超稳定的性能,改善了储存能力.
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:
- O3型层氧化物对离子电池 (SIB) 是有前途的.
- 由于Na-O键降解和在潮湿空气中的副作用反应造成的不良稳定性限制了它们的应用.
- 开发稳定的阴极材料对于推进SIB技术至关重要.
研究的目的:
- 开发一种新型O3型高层氧化物 (HE-NaMFN),以提高SIB的稳定性.
- 研究高度调制对正极材料结构和电化学性能的影响.
- 为了提高离子电池阴极的空气稳定性和循环性能.
主要方法:
- 通过高调制合成了一种新的O3型高层氧化物NaMn0.4Fe0.3Ni0.2M0.1O2 (HE-NaMFN,M = Cu/Ti/Zn/Sn/Sb).
- 描述了材料的结构,电子特性和空气稳定性.
- 评估了SIB的电化学性能,包括可逆容量,速率能力和循环稳定性.
主要成果:
- 高调节使O2p和金属d轨道 (Δp-d) 之间的能量差距从0.8增加到1.0 eV.
- 氧和金属原子之间的杂交减少导致金属-O相互作用减弱.
- 该HE-NaMFN材料表现出超稳定的性能,在暴露在空气中30天后保持稳定.
- 实现了156mAhg-1的可逆容量,容量保留90%,良好的速率能力和长期循环稳定性.
结论:
- 高度调制是一种有效的策略,用于提高O3型层氧化物对SIB的空气稳定性.
- 在HE-NaMFN中减弱的金属-O相互作用抑制了Na-O键的降解,并提高了结构的可逆性.
- 作为离子电池的稳定和高性能阴极材料,HE-NaMFN具有显著的潜力.
相关概念视频
03:26Electron Configuration of Multielectron Atoms
37.5K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
37.5K
03:06Alkali Metals
18.9K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
18.9K
02:48Ionic Bonding and Electron Transfer
39.6K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
39.6K
02:42Ionic Crystal Structures
13.9K
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...
13.9K
01:19Ionic Strength: Effects on Chemical Equilibria
1.2K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.2K
01:25MOS Capacitor
626
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
626