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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

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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.
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Alkali Metals03:06

Alkali Metals

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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).
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Alkyl Halides02:45

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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.
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Ionic Bonds00:42

Ionic Bonds

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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.
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Electrolytes: van't Hoff Factor03:08

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Colligative Properties of Electrolytes
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Hydrogen-Bond-Stabilized Organic Potassium-Ion Full Cell Operating at -40°C.

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
Summary
This summary is machine-generated.

Researchers developed a novel organic small molecule, BQXTO, for potassium-ion batteries. This material enables stable and efficient low-temperature energy storage, overcoming key limitations in current battery technology.

Keywords:
Full CellsLow‐temperature BatteriesOrganic ElectrodesPotassium‐ion Batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Low-temperature operation of energy storage systems is limited by slow ion kinetics and electrolyte freezing.
  • Potassium-ion batteries (PIBs) are promising for cost-effective energy storage but require stable cathode materials for sub-zero temperatures.
  • Existing cathode materials often lack the necessary stability and performance at ultra-low temperatures.

Purpose of the Study:

  • To design and synthesize a novel organic small molecule cathode material for high-performance low-temperature PIBs.
  • To investigate the structure-property relationships governing the electrochemical performance of organic cathodes.
  • To demonstrate the potential of organic materials in overcoming the challenges of low-temperature energy storage.

Main Methods:

  • Synthesis and characterization of the organic small molecule 1,4-dihydrobenzo[g]quinoxaline-2,3,5,10-tetraone (BQXTO).
  • Electrochemical evaluation of BQXTO as a cathode material in potassium-ion cells at low temperatures.
  • Analysis of intermolecular hydrogen bonds and π─π interactions influencing charge transfer and stability.

Main Results:

  • The BQXTO cathode exhibits enhanced charge transfer and insolubility due to synergistic hydrogen bonding and π─π interactions.
  • The assembled BQXTO||HC potassium-ion full cell achieved a high energy density of 188 Wh kg⁻¹ at -40 °C.
  • Exceptional cycling stability was observed, with 88.2% capacity retention over 2000 cycles at low temperatures.

Conclusions:

  • Organic small molecules, like BQXTO, can serve as effective cathode materials for advanced low-temperature potassium-ion batteries.
  • Strategic molecular design, incorporating hydrogen bonds and π─π interactions, is crucial for enhancing electrochemical performance and stability.
  • This work provides a new avenue for developing robust and efficient organic electrode materials for extreme-condition energy storage.