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Related Concept Videos

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Preparation of Nitriles01:12

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Nitriles to Amines: LiAlH4 Reduction00:55

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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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Understanding How Nitriles Stabilize Electrolyte/Electrode Interface at High Voltage.

Huozhen Zhi1, Lidan Xing1, Xiongwen Zheng1

  • 1Engineering Research Center of MTEES (Ministry of Education), Research Center of BMET (Guangdong Province), Engineering Lab. of OFMHEB (Guangdong Province), Key Lab. of ETESPG (GHEI), and Innovative Platform for ITBMD (Guangzhou Municipality), School of Chemistry and Environment, South China Normal University , Guangzhou 510006, China.

The Journal of Physical Chemistry Letters
|December 1, 2017
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Summary
This summary is machine-generated.

Nitriles stabilize high-voltage electrolytes not by forming a protective layer, but through a new interphasial chemistry. This finding corrects a long-held belief and guides future electrolyte design for better battery performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Nitriles are widely used as electrolyte additives in high-voltage lithium-ion batteries.
  • Their function was previously attributed to forming a stable monolayer on electrode surfaces, preventing electrolyte oxidation.
  • This traditional understanding limited the development of advanced battery electrolytes.

Purpose of the Study:

  • To investigate the true mechanism behind the anodic stability provided by nitriles in electrolytes.
  • To challenge the prevailing theory of nitrile-based surface passivation.
  • To provide a corrected mechanistic understanding for designing next-generation battery electrolytes.

Main Methods:

  • Computational calculations (e.g., density functional theory).
  • Electrochemical experiments (e.g., cyclic voltammetry, impedance spectroscopy).
  • Surface analysis techniques (e.g., X-ray photoelectron spectroscopy).

Main Results:

  • Nitriles undergo oxidative decomposition at high voltages, contrary to previous assumptions.
  • The observed electrolyte stability is due to the formation of a novel interphasial chemistry, not a simple physical barrier.
  • Calculations and experiments confirm the decomposition pathway and the resulting protective interphase.

Conclusions:

  • The high oxidation stability of nitrile-containing electrolytes results from a complex interphasial chemistry, not a passive monolayer.
  • This mechanistic correction is crucial for guiding the rational design of advanced electrolytes and interphases.
  • Future battery chemistries can benefit from this revised understanding for improved performance and safety.