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相关概念视频

Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Solubility Equilibria: Ionic Product of Water01:16

Solubility Equilibria: Ionic Product of Water

1.5K
Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le...
1.5K
Alkali Metals03:06

Alkali Metals

24.2K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.2K
Alkyl Halides02:45

Alkyl Halides

19.5K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
19.5K
Ionic Bonds00:42

Ionic Bonds

128.7K
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...
128.7K
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

36.3K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
36.3K

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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稳定有机离子全细胞,以键稳定,在-40°C下工作.

Wei-Sheng Zhang1, Xian-He Chen1, Chen-Xing Zhang1

  • 1State Key Laboratory of Explosion Science and Safety Protection, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Angewandte Chemie (International ed. in English)
|September 20, 2025
PubMed
概括

研究人员开发了一种新的有机小分子BQXTO,用于离子电池. 这种材料可实现稳定高效的低温储能,克服了当前电池技术的关键局限性.

关键词:
充满细胞的细胞低温电池 低温电池 低温电池有机电极 有机电极离子电池 离子电池

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 储能系统的低温运行受到缓慢的离子动力学和电解质结的限制.
  • 离子电池 (PIBs) 是一个具有成本效益的能源存储的有前途的电池,但需要稳定的阴极材料以零度以下的温度.
  • 现有的阴极材料往往缺乏必要的稳定性和在超低温下性能.

研究的目的:

  • 设计和合成一种新的有机小分子阴极材料,用于高性能低温PIB.
  • 为了研究结构-属性关系,控制有机阴极的电化学性能.
  • 展示有机材料在克服低温储能挑战方面的潜力.

主要方法:

  • 有机小分子1,4-二二[g]素-2,3,5,10-四 (BQXTO) 的合成和表征.
  • 在低温下对BQXTO作为低温离子电池中的阴极材料进行电化学评估.
  • 分析影响电荷转移和稳定性的分子间键和π─π相互作用.

主要成果:

  • 由于协同结和π─π相互作用,BQXTO阴极表现出增强的电荷转移和不可溶性.
  • 组装的BQXTO的水离子完整电池在-40°C时实现了188Wh kg-1的高能量密度.
  • 观察到异常的循环稳定性,在低温下2000个循环中88.2%的容量保留.

结论:

  • 像BQXTO这样的有机小分子可以作为先进的低温离子电池的有效阴极材料.
  • 战略分子设计,包括键和π─π相互作用,对于提高电化学性能和稳定性至关重要.
  • 这项工作为开发强大而高效的有机电极材料提供了新的途径,用于极端条件下储能.