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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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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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Introduction to Electrolytes01:33

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In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
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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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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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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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High entropy liquid electrolytes for lithium batteries.

Qidi Wang1, Chenglong Zhao2, Jianlin Wang3

  • 1Department of Radiation Science and Technology, Delft University of Technology, Delft, 2629JB, Netherlands.

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|February 10, 2023
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Summary
This summary is machine-generated.

Introducing multiple salts into liquid electrolytes significantly enhances lithium battery performance by increasing entropy. This high-entropy approach improves ion transport and stability, offering a new avenue for advanced battery design.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • High-entropy alloys/compounds offer superior properties due to configurational entropy.
  • The impact of entropy on liquid electrolyte thermodynamics and kinetics remains unclear.
  • Rechargeable lithium batteries require advanced electrolytes for improved performance.

Purpose of the Study:

  • To investigate the effect of increasing electrolyte entropy on liquid electrolytes for rechargeable lithium batteries.
  • To explore the potential of high-entropy electrolytes in enhancing battery performance.

Main Methods:

  • Synthesized a low-concentration dimethyl ether electrolyte with four salts.
  • Analyzed solvation structures and lithium-ion dynamics.
  • Evaluated cycling stability and rate capability compared to single-salt electrolytes.

Main Results:

  • Increased electrolyte entropy by introducing multiple salts led to diverse solvation structures.
  • Observed decreased solvation strengths, enhancing lithium-ion diffusivity.
  • Achieved stable interphase passivation layers and improved cycling stability/rate capability.
  • Demonstrated superior performance compared to single-salt electrolytes.

Conclusions:

  • High-entropy electrolytes offer a promising strategy for developing advanced lithium batteries.
  • Entropy-dominated solvation structures are key to improved ion transport and battery performance.
  • This approach opens new compositional spaces for energy storage applications.