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相关概念视频

Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Formation of Complex Ions03:45

Formation of Complex Ions

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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...
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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.1K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.1K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.6K
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. 
48.6K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.3K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Updated: Jan 12, 2026

Zinc-Sponge Battery Electrodes that Suppress Dendrites
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双重优学电解质与优化的内外溶解工程,用于跨相稳定金属电池.

Meixin Chen1, Yanfang Wang1, Qiaoli Zhang2

  • 1Key Laboratory of Advanced Materials Technologies International (HongKong Macao and Taiwan) Joint Laboratory on Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, P. R. China.

Advanced materials (Deerfield Beach, Fla.)
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概括

一种新的双电解质 (DEE) 通过平衡离子运输和耐腐蚀性来提高金属电池的性能. 这个新系统实现了延长周期寿命和在低温下稳定的运行.

关键词:
双倍的欧特克斯电解质可以提供.固体电解质接口的接口是固体电解质.溶解结构是一个溶解结构.金属电池 金属电池

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 性电解质 (EEs) 对金属电池具有前景,但面临着高粘度和离子迁移歇斯底里的挑战.
  • 化改善了EE中的离子运输,但加剧了腐蚀问题,限制了电池的寿命.

研究的目的:

  • 开发一种先进的电解质系统,克服传统电解质的局限性,以提高金属电池的性能.
  • 为了实现有效的离子运输动力学和减轻与腐蚀相关的降解之间的平衡.

主要方法:

  • 设计了一种新型的双电解质 (DEE),利用强烈的易斯酸相互作用和重建的结网络.
  • 研究了DEE对其调节电化学界面并形成稳定的固体电解质界面 (SEI) 层的能力.
  • 在包括低温在内的各种条件下,使用对称细胞,全细胞和囊细胞评估了电化学性能.

主要成果:

  • DEE系统在对称细胞中显著延长了循环寿命 (5900小时在1 mA cm-2,1 mAh cm-2; 3300小时在4 mA cm-2,4 mAh cm-2).
  • 观察到特殊的低温性能,在-20°C (0.5 mA cm−2) 持续循环8000小时.
  • 完整细胞实现了1000个循环,容量保持率为82.4% (N/P比为5.89),袋细胞显示了超过2000个循环 (0.5A g-1) 的耐用性.

结论:

  • 开发的DEE有效地平衡了离子传输和耐腐蚀性,从而提高了金属电池的稳定性和寿命.
  • DEE促进了稳定的SEI层的形成,减轻了水腐蚀,并使沉积均.
  • 这种电解质系统为高性能,耐用的金属电池提供了有前途的解决方案,包括在零度以下的温度下应用.