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Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Updated: Sep 17, 2025

$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

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Published on: November 10, 2014

Spin-Orchestrated Lithium Diffusion in Reforged Ferromagnetic Fe@C Anodes.

Myeong Seok Goh¹, Hyunsub Shin¹, Jaehun Lee¹

¹Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|July 2, 2025

Summary

Iron catalysts for clean hydrogen production are repurposed as advanced battery anodes. This dual-function material offers high capacity and enhanced performance using magnetic fields, creating efficient energy storage from a hydrogen byproduct.

Keywords:

conductor‐free lithium‐ion battery ferromagnetic Fe@C Anode hydrogen pyrolysis‐derived electrode materials in situ carbon encapsulation spin‐guided lithium diffusion

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Developing sustainable energy storage solutions is critical.
Repurposing materials from one application to another can improve resource efficiency.
Iron-based catalysts are used for methane pyrolysis to produce hydrogen.

Purpose of the Study:

To investigate the direct repurposing of iron catalysts used in methane pyrolysis as anode materials for lithium-ion batteries.
To evaluate the electrochemical performance of in situ carbon-coated iron composites (Fe@C900) as battery anodes.
To explore the effect of magnetic fields on the performance of these novel anodes.

Main Methods:

Methane pyrolysis at 900 °C to create Fe@C900 composite materials.
Electrochemical testing of Fe@C900 as a battery anode without conductive additives.
Application of a 5000 G magnetic field during battery cycling.
Multimodal characterization and Density Functional Theory (DFT) calculations.

Main Results:

Fe@C900 composite exhibits a reversible capacity of 380 mAh g⁻¹ with 98% retention over 1000 cycles.
Magnetic field application enhances rate performance by 150% through spin-guided lithium-ion migration.
Accelerated lithium kinetics, stable solid electrolyte interphase (SEI) formation, and deep lithiation were observed.
DFT calculations confirm strong lithium adsorption and low insertion barriers.

Conclusions:

A novel class of hydrogen-derived ferromagnetic anodes has been introduced.
The Fe@C900 composite serves as a high-rate, conductor-free lithium storage platform.
This strategy integrates hydrogen generation with energy storage, offering a scalable path to carbon-efficient, magnetically enhanced battery systems.