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Related Experiment Video

Updated: Jan 7, 2026

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

Published on: July 18, 2018

Interfacial Evolution and Accelerated Aging Mechanism for LiFePO₄/Graphite Pouch Batteries Under Multi-Step Indirect

Yun Liu^1,2, Jinyang Dong^3,4, Jialong Zhou^1,2

¹School of Materials Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China.

Nano-Micro Letters

|January 4, 2026

Summary

This summary is machine-generated.

Indirect activation (IA) of lithium iron phosphate (LFP)/graphite batteries mitigates iron dissolution and promotes uniform electrode/electrolyte interface (EEI) formation. This approach enhances battery longevity and aids in predicting accelerated aging.

Keywords:

Accelerated aging Dissolve of Fe ions EEI film Electrode/electrolyte interface Multi-step segmented indirect activation

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Area of Science:

Electrochemistry
Materials Science
Battery Technology

Background:

Iron dissolution from the cathode accelerates LiFePO4 (LFP)/graphite battery aging.
A systematic understanding of the electrode/electrolyte interface (EEI) layer and iron ion dissolution, including cathode-electrolyte interphase (CEI) and solid electrolyte interphase (SEI) mechanisms, is lacking.

Purpose of the Study:

To investigate the spatial distribution of the EEI and iron dissolution.
To elucidate the mechanisms of CEI, SEI, and iron dissolution.
To verify the interaction between dissolved Fe2+ and the EEI in LFP/graphite pouch batteries.

Main Methods:

Aged LFP/graphite cells were subjected to continuous activation and multi-step segmented indirect activation (IA).
Analysis included capacity fade, impedance growth, and active Li+ mass loss at the EEI and nanoscale levels.

Main Results:

Indirect activation (IA) facilitates solvated ion migration and inhibits organic species formation (e.g., ROCO2Li).
The SEI forms a continuous, uniform film of organic and inorganic small molecules.
IA promotes uniform EEI formation and mitigates iron dissolution.

Conclusions:

Indirect activation (IA) is a promising strategy for improving the stability and lifespan of LFP/graphite batteries.
This study provides insights into accelerated lifetime prediction strategies for lithium-ion batteries.