操纵Na3V2的无形和晶体杂交,以增强离子扩散动力学
Yingjie Zhou1, Xiecheng Yang1, Minjie Hou1
1Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China; National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Journal of colloid and interface science
|April 14, 2024
概括
一种结合无形和晶体相的新型混合阴极材料显著提高了离子电池的性能. 这种方法增强了离子扩散和更快充电和更长周期的能力.
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:
- 离子电池 (SIB) 是离子电池的一个有希望的替代品.
- Na3V2(PO4) 3 (NVP) 是SIB的潜在阴极材料,但其导电性和容量较差.
- 这些限制阻碍了NVP在高利率和长周期场景中的应用.
研究的目的:
- 开发一种混合阴极材料,整合NVP的无形和晶体相.
- 通过双相协调,提高NVP的速率性能和储能.
- 研究无形/晶相杂交对离子扩散和电化学性质的影响.
主要方法:
- 混合阴极材料与共存的无形和晶体相的制造.
- 电化学表征包括速率能力和循环稳定性测试.
- 固态核磁共振 (ss-NMR) 谱学用于分析材料结构和离子环境.
主要成果:
- 混合材料在离子扩散动力学上表现出1~2级的增强.
- 无形相增加了活性Na2位点的含量,导致更高的可逆容量.
- 在0.2°C时达到114 mAh/g的特定容量,在10°C时达到82 mAh/g,在300个循环后在5°C时保持95 mAh/g.
结论:
- 无形和晶体相的均质杂交是一种有效的策略,用于提高SIB中的NVP阴极性能.
- 双相方法克服了纯晶体NVP的局限性,使得更好的速率能力和周期寿命.
- 这项工作为设计下一代离子电池的先进阴极材料提供了一条途径.
相关概念视频
Ionic Strength: Effects on Chemical Equilibria
1.5K
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...
1.5K
Ionic 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
Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
Crystal Growth: Principles of Crystallization
1.9K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
1.9K
Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K


