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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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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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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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. 
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Ionic Bonds00:42

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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The Born-Haber Cycle02:44

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Lattice Energy 
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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接口 通过转换合金反应驱动的离子/电子再分配,用于高性能固态电池.

Jiayu Chen1,2, Sheng Feng1, Hongjian Lai1

  • 1The State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.

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概括

研究人员为固态金属电池开发了一种新的接口策略. 这种方法提高了阳极的稳定性和均沉积,通过防止树岩的形成,提高了电池的性能和安全性.

关键词:
纳西康的电解质转化合金的反应反应梯度相间阶段之间的梯度.接口电子阻断效应的作用.离子/电子重新分配固态Na电池 固态Na电池

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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
  • 固态化学 固态化学

背景情况:

  • 纳西康型导体为固态金属电池 (SSSMB) 提供高性能和安全性.
  • 接口问题和树的生长阻碍了基于NASICON的SSSMBs的实际应用.
  • 开发稳定的接口对于推进SSSMB技术至关重要.

研究的目的:

  • 为了解决基于NASICON的SSSSMB中的界面不兼容性和树的危险.
  • 为增强阳极性能设计一个梯度相间层.
  • 为了提高固态金属电池的循环稳定性和安全性.

主要方法:

  • 使用转化合金反应策略来创建梯度间相.
  • 介相由-锡 (Na-Sn) 合金和化 (NaF) 组成,位于NASICON电解质和Na阳极之间.
  • 对称细胞和全细胞的相间结构的表征和电化学性能评估.

主要成果:

  • 一个梯度性和电子阻断的介面相成功构建.
  • Na-Sn合金层促进了离子的运输,而NaF层阻断了电子.
  • 对称Na电池的临界电流密度 (CCD) 增加到1.7 mA cm-2,在0.5 mA cm-2.2下稳定循环1200小时.
  • 在循环过程中实现了均和无树的沉积.
  • 带有Na3V2(PO4)3和NaNi1/3Fe1/3Mn1/3O2阴极的准固态电池表现出色的电化学性能.

结论:

  • 拟议的接口策略有效地减轻了基于NASICON的SSSMB中的接口问题和树状石的形成.
  • 梯度间相增强了阳极的稳定性和电化学性能.
  • 这种方法对开发高性能和安全的固态金属电池具有显著的前景.