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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Ionic Association01:28

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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The Debye–Hückel Theory of Electrolyte Solutions01:27

The Debye–Hückel Theory of Electrolyte Solutions

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The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means...
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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Weak Acid Solutions04:02

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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A Weak-Aggregation Electrolyte Enables Lithium-Ion Capacitors at Ultra-Low Temperature.

Chunlei Zhang1,2, Qifan Peng1, Kai Wang1,2

  • 1State Key Laboratory of High Density Electromagnetic Power and Systems, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China.

Angewandte Chemie (International Ed. in English)
|March 18, 2026
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Summary

Researchers developed a novel weak-aggregation electrolyte for energy storage devices (ESDs) that functions at ultra-low temperatures. This breakthrough enables reliable performance in extreme cold, crucial for applications like satellites and Antarctic stations.

Keywords:
hybrid capacitorinterfacial kineticslow‐temperaturesolvation structureweak‐aggregation electrolyte

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Extreme cold environments necessitate advanced energy storage devices (ESDs).
  • Conventional electrolytes fail at ultra-low temperatures (-100°C) due to poor ion transport and interfacial instability.
  • Existing ESDs struggle with performance degradation in sub-zero conditions.

Purpose of the Study:

  • To design a novel electrolyte for stable and efficient electrochemical energy storage at ultra-low temperatures (ULT).
  • To overcome the limitations of conventional electrolytes in extreme cold environments.
  • To enable reliable operation of ESDs in demanding applications like space exploration and polar research.

Main Methods:

  • Development of a weak-aggregation (AGG-w) electrolyte incorporating a unilaterally fluorinated motif.
  • Molecular engineering to enhance steric hindrance and reconfigure molecular dipoles for improved solvent-anion interactions.
  • Characterization of ion transport, interfacial kinetics, viscosity, and ionic conductivity at ULT.
  • Testing of 1100 F pouch cells under extreme cold conditions (-40°C and -100°C).

Main Results:

  • The AGG-w electrolyte demonstrates reconciled bulk-phase ion transport and interfacial kinetics at ULT.
  • Enhanced solvent-anion cooperativity accelerates desolvation kinetics and reduces interfacial resistance.
  • The electrolyte maintains low viscosity and high ionic conductivity at ULT.
  • 1100 F pouch cells show 97.9% capacity retention after 7 months at -40°C and achieve discharge capability at -100°C.

Conclusions:

  • Weak-interaction engineering provides a critical paradigm for designing advanced electrolytes.
  • The AGG-w electrolyte establishes a generalizable strategy for high-performance electrochemistry in extreme conditions.
  • This work enables the development of robust ESDs for satellites, research stations, and other extreme cold applications.