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Electrochemical Systems

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

Ionic Association

Ionic Association

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.

Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

Formation of Complex Ions

Formation of Complex Ions

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...

The Debye–Hückel Theory of Electrolyte Solutions

The Debye–Hückel Theory of Electrolyte Solutions

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 that cations...

Ionic Bonds

Ionic Bonds

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.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...

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Related Experiment Video

Updated: Jun 13, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

A Multifunctional Electrolyte Additive K₃P₇ for Simultaneous Capacity Compensation and Interphase Regulation in

Xiaoyi Wang^1,2, Yiqing Li³, Zichuan Wang⁴

¹School of Chemical Engineering and Technology, Tianjin University, Tianjin, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|June 12, 2026

Summary

This summary is machine-generated.

Potassium phosphide (K3P7) as an electrolyte additive significantly boosts lithium-ion battery performance by compensating for initial capacity loss and enhancing stability. This novel additive improves energy density and cycle life for advanced battery applications.

Keywords:

capacity‐compensation electrode‐electrolyte interphase electrolyte additive gas generation inhibition lithium‐ion batteries

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Construction and Testing of Coin Cells of Lithium Ion Batteries

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Published on: August 2, 2012

Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Initial irreversible capacity loss (ICL) in lithium-ion batteries (LIBs) limits energy and power densities.
Existing prelithiation additives have drawbacks like low capacity, poor air stability, and inefficiency.

Purpose of the Study:

To introduce K3P7 as a novel electrolyte additive for LIBs.
To enhance reversible capacities and improve overall battery performance.

Main Methods:

K3P7 was investigated as an electrolyte additive in commercial LIBs.
Its effects on capacity compensation, graphite anode performance, interface stability, and gas generation were analyzed.
Performance was validated in a LiNi0.8Co0.1Mn0.1O2||graphite full cell.

Main Results:

K3P7 provides a high capacity-compensation effect (3048 mAh g-1) via P7(3-) oxidation.
K+ ion intercalation enhances graphite anode rate capability.
Improved cathode electrolyte interphase (CEI) and solid electrolyte interface (SEI) formation enhance cycle stability.
Reduced gas generation and internal pressure build-up were observed.
Full cell testing showed an 8% increase in initial reversible capacity and 92.9% capacity retention after 200 cycles.

Conclusions:

K3P7 is a facile, multi-functional electrolyte additive for LIBs.
It effectively addresses ICL, enhances rate performance, and improves cycle stability.
This additive offers a promising strategy for advancing LIB technology.