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相关概念视频

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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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

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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 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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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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双重功能协调相互作用使得高负载硫电池的多硫化物转化速度快,并具有强大的相间作用.

Wenchang Han1, Jiyue Hou1, Fei Wang1

  • 1National local joint engineering research center for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Batteries Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China. zynlegolas@kust.edu.cn.

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概括

一种新型的添加剂,6- ((dibutylamino) -1,3,5-triazine-2,4-thiol (DTD),通过加速聚硫化物转化和稳定阳极来提高硫电池 (LSB) 的性能. 这导致显著改善周期寿命和容量保留.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 高容量硫电池 (LSB) 面临着由于聚硫化物 (LiPS) 转换动力学缓慢和不稳定的金属阳极的挑战.
  • 这些问题限制了LSB用于储能的实际应用和长期稳定性.

研究的目的:

  • 引入6-(dibutylamino)-1,3,5-triazine-2,4-thiol (DTD) 作为一种功能添加剂,以提高LSB的性能.
  • 研究DTD加速正极转换并调节阳极接口的机制.
  • 为了证明DTD修改的LSB的增强稳定性和容量保留.

主要方法:

  • 合成和纳入DTD作为添加剂在LSBs.
  • 电化学测试,包括循环性能,速率能力和Li-Li对称细胞测试.
  • 对固体电解质接口 (SEI) 和聚硫化物氧化还原行为的分析.

主要成果:

  • 添加DTD显著促进LiPS的氧化还原转换,并形成一个协同无机有机SEI层.
  • 带有DTD的LSB在1C的600个周期中表现出每周期0.066%的低容量衰变率.
  • -对称电池显示过量的潜力减少,周期寿命增加41%;高硫负载的LSB保持71.5%的容量.

结论:

  • DTD有效地加速了聚硫化物转化,并稳定了LSB中的阳极接口.
  • 该研究为了解高能量密度LSB中的聚硫化物转化和SEI调节提供了一个新的机制.
  • 对于开发稳定和高性能硫电池,DTD提供了一个有前途的战略.