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Electrolyte and Nonelectrolyte Solutions

Electrolyte and Nonelectrolyte Solutions

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.

Oxidation Numbers

Oxidation Numbers

In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.

Electrolytes: van't Hoff Factor

Electrolytes: van't Hoff Factor

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...

Alkali Metals

Alkali Metals

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).
Table 1: Properties of the alkali metals

Oxidation-Reduction Reactions

Oxidation-Reduction Reactions

Oxidation–Reduction Reactions

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

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Related Experiment Video

Updated: Jan 22, 2026

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

Published on: January 26, 2016

Stabilizing Polyether Electrolyte with a 4 V Metal Oxide Cathode by Nanoscale Interfacial Coating.

Haowei Zhai, Tianyao Gong, Bingqing Xu¹

¹State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , P. R. China.

ACS Applied Materials & Interfaces

|July 18, 2019

Summary

A thin aluminum oxide (Al2O3) coating enhances the stability of poly(ethylene glycol) (PEG) electrolytes with high-energy density lithium-ion battery cathodes. This breakthrough improves battery safety and longevity, paving the way for advanced energy storage solutions.

Keywords:

NMC cathode atomic layer deposition battery safety lithium anode poly(ethylene oxide)polymer electrolyte thermal runaway

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Last Updated: Jan 22, 2026

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

High-energy density batteries require safe electrolytes, with polyether-based options like poly(ethylene glycol) (PEG) offering thermal stability and lithium anode compatibility.
Current polyether electrolytes exhibit poor stability with high-voltage lithium nickel manganese cobalt oxide (NMC) cathodes, limiting their application in advanced batteries.

Purpose of the Study:

To improve the electrochemical stability between poly(ethylene glycol) (PEG) electrolytes and 4 V lithium nickel manganese cobalt oxide (NMC) cathodes.
To enable the development of safer, high-energy density lithium-ion batteries.

Main Methods:

A nanoscale 2 nm aluminum oxide (Al2O3) coating was applied to the surface of NMC cathode materials.
Electrochemical performance and cycling stability were evaluated for coated and uncoated NMC cathodes with PEG electrolytes.

Main Results:

The Al2O3 coating significantly improved the compatibility between the PEG electrolyte and NMC cathode, stabilizing the cathode-electrolyte interphase.
Al2O3-coated NMC electrodes retained 84.7% capacity after 80 cycles and 70.3% after 180 cycles, a substantial improvement over bare NMC electrodes (less than 50% capacity after 20 cycles).

Conclusions:

Nanoscale Al2O3 coatings are an effective strategy to enhance the stability of polyether-based electrolytes with high-voltage NMC cathodes.
This approach offers a promising pathway for developing safer and more durable high-energy density lithium-ion batteries.