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The Electrical Double Layer

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Related Experiment Video

Updated: Jun 21, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Optimizing Carbon Coating Process for Lithium-Rich LiFePO₄ Cathode Materials.

Shin Park¹, Docheon Ahn², Jihee Yoon³

¹Department of Battery Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.

|March 21, 2025

Summary

This summary is machine-generated.

The synthesis method significantly impacts Li-rich lithium iron phosphate (Li-rich LFP) performance. Adding carbon coating after crystal formation (C/ALF) yields superior electrochemical properties compared to pre-formation coating (C/BLF).

Keywords:

Carbon coating process Cathode Lithium rich lithium iron phosphate Lithium-ion batteries

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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy

Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy

Published on: January 20, 2023

Area of Science:

Materials Science
Electrochemistry
Solid-state Chemistry

Background:

Stoichiometric LiFePO4 (LFP) suffers from poor ionic and electronic conductivity, limiting its application in lithium-ion batteries.
Li-rich LiFePO4 (Li-rich LFP) offers improved conductivity but requires optimized synthesis for enhanced performance.
The influence of carbon coating strategies on Li-rich LFP's structural and electrochemical characteristics remains incompletely understood.

Purpose of the Study:

To investigate the impact of carbon precursor addition timing on the crystal structure and electrochemical performance of Li-rich LFP.
To compare two distinct synthesis routes: carbon precursor addition before Li-rich LFP crystal formation (C/BLF) and after (C/ALF).
To elucidate how carbon coating process sequence affects the material's properties.

Main Methods:

Synthesis of Li-rich LFP via two methods: C/BLF and C/ALF.
Characterization of crystal structure, unit cell volume, and carbon coating density.
Electrochemical performance evaluation, including discharge capacity and overpotential measurements.

Main Results:

The C/ALF synthesis process resulted in a larger unit cell volume and a denser carbon coating layer compared to C/BLF.
The C/ALF sample demonstrated a lower overpotential (0.54 V).
The C/ALF sample exhibited a higher discharge capacity (~134.13 mAhg⁻¹).

Conclusions:

The sequence of carbon coating significantly influences the crystal structure and electrochemical performance of Li-rich LFP.
The C/ALF method, where carbon is added after crystal formation, is superior for achieving enhanced electrochemical properties.
Optimizing carbon coating strategies is crucial for advancing Li-rich LFP materials for battery applications.