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相关概念视频

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

319
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
319
SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

9.4K
An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
9.4K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

421
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
421
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.3K
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...
1.3K

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Updated: May 28, 2025

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
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在基于SnSb的阳极中实现多价值诱导稳定性的高工程.

Wei Ran1, Gao Cheng2, Jiajin Luo2

  • 1School of Materials and Energy, Chongqing Key Lab for Battery Materials and Technologies, Southwest University, Chongqing 400715, P. R. China.

ACS applied materials & interfaces
|February 10, 2025
PubMed
概括

使用Ti和Al (SSBTA-600) 的基于SnSb的氧化物的高工程增强了离子电池阳极. 这种方法通过创造氧气空缺来提高能量密度和循环寿命,从而提高合金类型阳极的性能.

关键词:
周期性稳定性 周期性稳定性高速能力能力的高率能力.离子电池是一种离子电池.有一个空缺的氧气.基于SnSb的高氧化物.

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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
  • 纳米技术 纳米技术

背景情况:

  • 合金类型的阳极面临着体积扩张的挑战,限制了离子电池的能量密度和循环寿命.
  • 开发稳定和高性能阳极材料对于推进储能技术至关重要.

研究的目的:

  • 使用Ti和Al编码对改进的合金类型阳极进行新型高性SnSb基氧化物 (SSBTA-600) 的工程.
  • 研究氧气空缺在提高电化学性能和循环稳定性方面的作用.

主要方法:

  • 基于SnSb的高工程氧化物与Ti和Al配合,在600°C时化.
  • 电化学测试SSBTA-600作为离子电池中的阳极材料.
  • 使用电子磁共振 (EPR) 和X射线吸收光谱 (XAS) 进行表征,以确认氧气空缺.

主要成果:

  • SSBTA-600 具有高容量 (1012 mAh g-1 在 0.5 A g-1 时) 和优异的容量保留 (在 500 个循环后 99%).
  • 卓越的速率能力证明了297mAhg-1在5Ag-1和83.5%的保留.
  • 一个LiFePO4administratorSSBTA全电池在100个循环后实现了134mAhg-1的功率,保持了89.4%.

结论:

  • 高工程有效地促进氧气空缺,显著提高合金类型阳极的周期稳定性和高速性能.
  • 开发的SSBTA-600材料对下一代离子电池具有更高的能量密度和寿命有很大的前景.