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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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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...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Roles of Electrolytes: Calcium and Phosphate01:27

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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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Ethylene Carbonate-Based Electrolyte Decomposition and Solid-Electrolyte Interphase Formation on Ca Metal Anodes.

Joshua Young1, Manuel Smeu1

  • 1Department of Physics , Binghamton University , Binghamton , New York 13902 , United States.

The Journal of Physical Chemistry Letters
|June 2, 2018
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Understanding solid-electrolyte interphase (SEI) formation in multivalent ion batteries is key. This study reveals CaCO3, CaO, and Ca(OH)2 as primary SEI components, with a dominant decomposition pathway involving multiple ethylene carbonate molecules.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Solid-electrolyte interphase (SEI) formation from organic solvent decomposition hinders multivalent ion battery development.
  • SEI layers impede ionic diffusion and reversible electrode reactions.

Purpose of the Study:

  • Investigate SEI formation on calcium (Ca) metal anodes.
  • Elucidate the decomposition mechanisms of ethylene carbonate (EC) and EC/Ca(ClO4)2 electrolytes.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Ab initio molecular dynamics (AIMD) simulations.

Main Results:

  • Identified CaCO3, CaO, and Ca(OH)2 as primary inorganic SEI components.
  • Determined that a multi-molecule EC decomposition pathway yielding C2H4O2(2-) and CO dominates over a simpler two-electron reduction.
  • Observed similar decomposition behaviors with the inclusion of Ca(ClO4)2 salt.

Conclusions:

  • The complex decomposition of EC is crucial for understanding SEI formation in Ca-based batteries.
  • Computational methods provide valuable insights into SEI mechanisms, guiding future electrolyte design.